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ROLLOUT 2 · celery/celery

celery__celery-9465

Not solved
463 stotal time
16tool calls
18model calls
8,227tokens generated
164,947prompt tokens read

Test failures/errors recorded in JUnit XML (failures=1, errors=0)

⚠ The request log has 17 model calls but the trace has 19 agent calls, so tokens are listed separately instead of beside each turn.

Turn by turn

Token shading: p ≥ 0.9 0.5 – 0.9 0.2 – 0.5 below 0.2. Hover a token for its id and probability.

System instructions 4,822 characters
You are a principal Python software engineer resolving a repository issue in `/workspace`.
Your sole objective is to produce a minimal, root-cause source patch that passes every hidden fail-to-pass and pass-to-pass regression test on the first grading run.

## Critical Environment & Grader Rules
1. **Air-Gapped Sandbox & Available CLI Tools**: No network access. Never run `pip`, `uv`, `conda`, or `git fetch`. Note: `rg` (`ripgrep`) is NOT installed in the container — always use `grep -rn --include="*.py"` for fast exact searches so you never waste a tool call on `command not found`.
2. **Protected Grading Paths**: Before running official verification, the grading harness **strips and reverts all changes** to `tests/`, `test/`, `testing/`, `test_*.py`, `*_test.py`, `conftest.py`, `pyproject.toml`, `setup.cfg`, `pytest.ini`, and `tox.ini`. Every part of your fix MUST reside in non-test production source files.
3. **Untracked File Trap (`git add -N .`)**: `submit_patch` stages ALL untracked files inside `/workspace`! Never leave reproduction or scratch files inside `/workspace` — run reproductions inline via `python3 - <<'PY'` or inside `/tmp/repro.py` in a single `run_command`.
4. **Stdout Truncation Rule**: `run_command` truncates stdout after the first 5,000 characters from the TOP. Always run pytest quietly with short tracebacks:
   `pytest path/to/test_file.py -k pattern -q --tb=short --no-header`
   If a test file is large, redirect output to `/tmp/pytest.log` and inspect `tail -n 80 /tmp/pytest.log` so failure tracebacks at the bottom are never cut off.
5. **Strict Pacing Discipline**: `get_status` and `submit_patch` are free and do NOT count toward `max_tool_calls`. Target **16-22 counted tool calls total**, and **begin your first `edit_file` change no later than tool call 15**. Reserve at least 4 calls for verification, `git status --short && git diff`, and submission.

## Execution Protocol

### Phase 1 — Pinpoint Code & Tests Immediately (1-2 tool calls)
- The user message already contains `Workspace Layout` — do NOT waste a turn running `ls` on top-level directories.
- Run a single compound `run_command` with `grep -rn --include="*.py"` to locate:
  (a) the exact symbols, error strings, or functions from the problem description,
  (b) **all parallel or sibling implementations** (for example sync + async variants, `Client` + `AsyncClient`, serializer + deserializer, multiple backends/dialects, base + subclass methods, `__init__.py` / `__all__` exports), and
  (c) the closest existing unit test files under `tests/`.

### Phase 2 — Deep Read & Spec Anchor (2-5 tool calls)
- Use `read_file` with generous `start_line` and `end_line` windows (180-300 lines per call so you read whole modules in fewer calls) on the target function/class, callers, type annotations, and neighboring tests.
- Before editing, verify every explicit and implicit requirement from the issue: exact parameter names, defaults, boundary/domain edge cases, exception types/messages, `None` vs empty collection vs falsy (`0`, `False`, `""`) semantics, mutability/copying, and return types.

### Phase 3 — Reproduce Bug in One Call (1 tool call)
- Run ONE concise command (`python3 - <<'PY' ... PY` or targeted `pytest ... -q --tb=short --no-header`) via `run_command` to observe the exact pre-fix failure. Do NOT spend multiple tool calls writing separate reproduction scripts.

### Phase 4 — Surgical Implementation Across All Parallel Paths (1-4 tool calls)
- Begin editing by tool call 15! Use `edit_file` with 4-6 lines of exact surrounding context copied from `read_file`.
- Update ALL parallel codepaths (sync/async, multiple classes/dialects, type hints) consistently so partial fixes do not fail sibling tests.
- **2-Strike Edit Rule**: If `edit_file` fails twice on the same block due to whitespace or escaping, do not retry `edit_file` a third time — apply an atomic Python transformation via `run_command` and immediately verify `python3 -m py_compile path/to/file.py`.

### Phase 5 — Edge-Case Verification, Diff Hygiene & Clean Exit (2-4 tool calls)
- Run a single compound `run_command` testing both your reproduction + boundary edge cases (`None`, empty input, leading/trailing delimiters, subdomain/prefix boundaries, subclass/async parity) AND the relevant existing `pytest` module(s) with `-q --tb=short --no-header`.
- Run `git status --short && git diff` via `run_command`. Confirm:
  - ZERO untracked (`??`) files in `/workspace` (`rm -f` any untracked workspace files immediately),
  - ZERO modifications to `tests/` or protected config files (`git checkout -- tests/` if touched),
  - Minimal, clean diff with valid imports and indentation.
- Call `submit_patch` once verification passes, then respond with a brief 2-sentence plain-text summary and make NO further tool calls.
Task prompt 8,012 characters
You are evaluating a software engineering task for repository celery/celery.

Problem Statement:
Config cassandra backend port config not work
## Checklist

- [ ] I have included the output of ``celery -A proj report`` in the issue.
      (if you are not able to do this, then at least specify the Celery
       version affected).
```
software -> celery:4.1.0 (latentcall) kombu:4.1.0 py:2.7.12
            billiard:3.5.0.3 py-amqp:2.2.2
platform -> system:Linux arch:64bit, ELF imp:CPython
loader   -> celery.loaders.app.AppLoader
settings -> transport:amqp results:cassandra

broker_url: u'amqp://guest:********@localhost:32781//'
cassandra_entry_ttl: 86400
cassandra_table: 'tasks_result'
cassandra_port: '61003'
cassandra_write_consistency: 'ONE'
cassandra_read_consistency: 'ONE'
include: [u'celery_for_medium.tasks']
result_backend: 'cassandra'
cassandra_keyspace: u'********'
cassandra_servers: ['localhost']
```
- [ ] I have verified that the issue exists against the `master` branch of Celery.

## Steps to reproduce

## Expected behavior
Result data should write correctly to cassandra database at: **localhost:61003**
## Actual behavior
```
[2018-12-07 14:28:17,815: ERROR/ForkPoolWorker-1] Control connection failed to connect, shutting down Cluster:
Traceback (most recent call last):
  File "cassandra/cluster.py", line 1301, in cassandra.cluster.Cluster.connect
    self.control_connection.connect()
  File "cassandra/cluster.py", line 2802, in cassandra.cluster.ControlConnection.connect
    self._set_new_connection(self._reconnect_internal())
  File "cassandra/cluster.py", line 2845, in cassandra.cluster.ControlConnection._reconnect_internal
    raise NoHostAvailable("Unable to connect to any servers", errors)
NoHostAvailable: ('Unable to connect to any servers', {'localhost': error(111, "Tried connecting to [('localhost', 9042)]. Last error: Connection refused")})
```


## Task Budget (Session terminates when any budget is exhausted)
- Time allowance: 7.5 minutes
- Tool calls allowance: 30 calls
- Max loop iterations: 40 turns

## Execution Environment Rules
- Single command timeout: 90 seconds (commands exceeding this fail without ending the session)
- Command output limit: 5000 characters
- File view limit: 150 lines per read_file call
- File character limit: 10000 characters per read_file call
- Environment is offline (no network/PyPI access). All repository and test dependencies are ALREADY pre-installed. Do NOT attempt to run pip install or download packages.

## Instructions:
0. All source code is under `/workspace`. Do NOT search outside `/workspace` (e.g. `/usr/`, `/wheels/`, system site-packages). If imports fail, the issue is in the source code under `/workspace`, not in missing system packages.
1. Analyze the problem statement and any provided hints carefully to identify all requested script paths, CLI subcommands, or Python modules.
2. Inspect existing codebase conventions and test files before making edits.
3. Verify your implementation using targeted tests or inline assertions before submitting.
4. Call submit_patch only after your implementation is complete and verified.
5. As your final action, you must return a text-only response reporting your completion to terminate the session.
## Workspace Layout
The repository is located at `/workspace`. Here is the directory tree (up to 3 levels):
```
./CONTRIBUTING.rst
./CONTRIBUTORS.txt
./Changelog.rst
./LICENSE
./MANIFEST.in
./Makefile
./README.rst
./SECURITY.md
./TODO
./bandit.json
./celery
./celery/__init__.py
./celery/__main__.py
./celery/_state.py
./celery/app
./celery/app/__init__.py
./celery/app/amqp.py
./celery/app/annotations.py
./celery/app/autoretry.py
./celery/app/backends.py
./celery/app/base.py
./celery/app/builtins.py
./celery/app/control.py
./celery/app/defaults.py
./celery/app/events.py
./celery/app/log.py
./celery/app/registry.py
./celery/app/routes.py
./celery/app/task.py
./celery/app/trace.py
./celery/app/utils.py
./celery/apps
./celery/apps/__init__.py
./celery/apps/beat.py
./celery/apps/multi.py
./celery/apps/worker.py
./celery/backends
./celery/backends/__init__.py
./celery/backends/arangodb.py
./celery/backends/asynchronous.py
./celery/backends/azureblockblob.py
./celery/backends/base.py
./celery/backends/cache.py
./celery/backends/cassandra.py
./celery/backends/consul.py
./celery/backends/cosmosdbsql.py
./celery/backends/couchbase.py
./celery/backends/couchdb.py
./celery/backends/database
./celery/backends/dynamodb.py
./celery/backends/elasticsearch.py
./celery/backends/filesystem.py
./celery/backends/gcs.py
./celery/backends/mongodb.py
./celery/backends/redis.py
./celery/backends/rpc.py
./celery/backends/s3.py
./celery/beat.py
./celery/bin
./celery/bin/__init__.py
./celery/bin/amqp.py
./celery/bin/base.py
./celery/bin/beat.py
./celery/bin/call.py
./celery/bin/celery.py
./celery/bin/control.py
./celery/bin/events.py
./celery/bin/graph.py
./celery/bin/list.py
./celery/bin/logtool.py
./celery/bin/migrate.py
./celery/bin/multi.py
./celery/bin/purge.py
./celery/bin/result.py
./celery/bin/shell.py
./celery/bin/upgrade.py
./celery/bin/worker.py
./celery/bootsteps.py
./celery/canvas.py
./celery/concurrency
./celery/concurrency/__init__.py
./celery/concurrency/asynpool.py
./celery/concurrency/base.py
./celery/concurrency/eventlet.py
./celery/concurrency/gevent.py
./celery/concurrency/prefork.py
./celery/concurrency/solo.py
./celery/concurrency/thread.py
./celery/contrib
./celery/contrib/__init__.py
./celery/contrib/abortable.py
./celery/contrib/django
./celery/contrib/migrate.py
./celery/contrib/pytest.py
./celery/contrib/rdb.py
./celery/contrib/sphinx.py
./celery/contrib/testing
./celery/events
./celery/events/__init__.py
./celery/events/cursesmon.py
./celery/events/dispatcher.py
./celery/events/dumper.py
./celery/events/event.py
./celery/events/receiver.py
./celery/events/snapshot.py
./celery/events/state.py
./celery/exceptions.py
./celery/fixups
./celery/fixups/__init__.py
./celery/fixups/django.py
./celery/loaders
./celery/loaders/__init__.py
./celery/loaders/app.py
./celery/loaders/base.py
./celery/loaders/default.py
./celery/local.py
./celery/platforms.py
./celery/result.py
./celery/schedules.py
./celery/security
./celery/security/__init__.py
./celery/security/certificate.py
./celery/security/key.py
./celery/security/serialization.py
./celery/security/utils.py
./celery/signals.py
./celery/states.py
./celery/utils
./celery/utils/__init__.py
./celery/utils/abstract.py
./celery/utils/annotations.py
./celery/utils/collections.py
./celery/utils/debug.py
./celery/utils/deprecated.py
./celery/utils/dispatch
./celery/utils/functional.py
./celery/utils/graph.py
./celery/utils/imports.py
./celery/utils/iso8601.py
./celery/utils/log.py
./celery/utils/nodenames.py
./celery/utils/objects.py
./celery/utils/quorum_queues.py
./celery/utils/saferepr.py
./celery/utils/serialization.py
./celery/utils/static
./celery/utils/sysinfo.py
./celery/utils/term.py
./celery/utils/text.py
./celery/utils/threads.py
./celery/utils/time.py
./celery/utils/timer2.py
./celery/worker
./docker
./docker/Dockerfile
./docker/docker-compose.yml
./docker/docs
./docker/entrypoint
./docker/scripts
./docs
./examples
./extra
./extra/WindowsCMD-AzureWebJob
./extra/bash-completion
./extra/generic-init.d
./extra/macOS
./extra/release
./extra/supervisord
./extra/systemd
./extra/zsh-completion
./helm-chart
./helm-chart/Chart.yaml
./helm-chart/README.rst
./helm-chart/templates
./helm-chart/values.yaml
./pyproject.toml
./requirements
./requirements/README.rst
./requirements/default.txt
./requirements/deps
./requirements/dev.txt
./requirements/docs.txt
./requirements/extras
./requirements/pkgutils.txt
./requirements/security.txt
./requirements/test-ci-base.txt
./requirements/test-ci-default.txt
./requirements/test-integration.txt
./requirements/test-pypy3.txt
./requirements/test.txt
./setup.cfg
./setup.py
./t
./t/__init__.py
./t/benchmarks
./t/integration
./t/skip.py
./t/smoke
./t/unit
./tox.ini
```
Turn 1at 45 s144 tokens out4,734 prompt tokens
The user is reporting that the `cassandra_port` configuration is not being used when using the Cassandra result backend.
The error message show that it's trying to connect to `localhost:9042` (the default Cassandra port) even though `cassandra_port: '61003'` is configured.

The layout shows `celery/backends/cassandra.py` exists. This is most likely where the Cassandra backend is implemented.

Let's start by examining `celery/backends/cassandra.py`.
TOOL CALL · run_command
{
  "command": "grep -rn --include=\"*.py\" \"cassandra_port\" ."
}
Result of run_command 156 characters
{
  "status": "ok",
  "stdout": "./celery/backends/cassandra.py:99:        self.port = port or conf.get('cassandra_port', None)\n",
  "stderr": "",
  "exit_code": 0
}
Turn 2at 49 s66 tokens out4,947 prompt tokens
Okay, the `cassandra_port` is mentioned in `celery/backends/cassandra.py` at line 99.
Let's read the file to see how it's used.
TOOL CALL · read_file
{
  "filepath": "celery/backends/cassandra.py"
}
Result of read_file 5,164 characters
{
  "status": "ok",
  "filepath": "celery/backends/cassandra.py",
  "content": "\"\"\"Apache Cassandra result store backend using the DataStax driver.\"\"\"\nimport threading\n\nfrom celery import states\nfrom celery.exceptions import ImproperlyConfigured\nfrom celery.utils.log import get_logger\n\nfrom .base import BaseBackend\n\ntry:  # pragma: no cover\n    import cassandra\n    import cassandra.auth\n    import cassandra.cluster\n    import cassandra.query\nexcept ImportError:\n    cassandra = None\n\n\n__all__ = ('CassandraBackend',)\n\nlogger = get_logger(__name__)\n\nE_NO_CASSANDRA = \"\"\"\nYou need to install the cassandra-driver library to\nuse the Cassandra backend.  See https://github.com/datastax/python-driver\n\"\"\"\n\nE_NO_SUCH_CASSANDRA_AUTH_PROVIDER = \"\"\"\nCASSANDRA_AUTH_PROVIDER you provided is not a valid auth_provider class.\nSee https://datastax.github.io/python-driver/api/cassandra/auth.html.\n\"\"\"\n\nE_CASSANDRA_MISCONFIGURED = 'Cassandra backend improperly configured.'\n\nE_CASSANDRA_NOT_CONFIGURED = 'Cassandra backend not configured.'\n\nQ_INSERT_RESULT = \"\"\"\nINSERT INTO {table} (\n    task_id, status, result, date_done, traceback, children) VALUES (\n        %s, %s, %s, %s, %s, %s) {expires};\n\"\"\"\n\nQ_SELECT_RESULT = \"\"\"\nSELECT status, result, date_done, traceback, children\nFROM {table}\nWHERE task_id=%s\nLIMIT 1\n\"\"\"\n\nQ_CREATE_RESULT_TABLE = \"\"\"\nCREATE TABLE {table} (\n    task_id text,\n    status text,\n    result blob,\n    date_done timestamp,\n    traceback blob,\n    children blob,\n    PRIMARY KEY ((task_id), date_done)\n) WITH CLUSTERING ORDER BY (date_done DESC);\n\"\"\"\n\nQ_EXPIRES = \"\"\"\n    USING TTL {0}\n\"\"\"\n\n\ndef buf_t(x):\n    return bytes(x, 'utf8')\n\n\nclass CassandraBackend(BaseBackend):\n    \"\"\"Cassandra/AstraDB backend utilizing DataStax driver.\n\n    Raises:\n        celery.exceptions.ImproperlyConfigured:\n            if module :pypi:`cassandra-driver` is not available,\n            or not-exactly-one of the :setting:`cassandra_servers` and\n            the :setting:`cassandra_secure_bundle_path` settings is set.\n    \"\"\"\n\n    #: List of Cassandra servers with format: ``hostname``.\n    servers = None\n    #: Location of the secure connect bundle zipfile (absolute path).\n    bundle_path = None\n\n    supports_autoexpire = True      # autoexpire supported via entry_ttl\n\n    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,\n                 port=9042, bundle_path=None, **kwargs):\n        super().__init__(**kwargs)\n\n        if not cassandra:\n            raise ImproperlyConfigured(E_NO_CASSANDRA)\n\n        conf = self.app.conf\n        self.servers = servers or conf.get('cassandra_servers', None)\n        self.bundle_path = bundle_path or conf.get(\n            'cassandra_secure_bundle_path', None)\n        self.port = port or conf.get('cassandra_port', None)\n        self.keyspace = keyspace or conf.get('cassandra_keyspace', None)\n        self.table = table or conf.get('cassandra_table', None)\n        self.cassandra_options = conf.get('cassandra_options', {})\n\n        # either servers or bundle path must be provided...\n        db_directions = self.servers or self.bundle_path\n        if not db_directions or not self.keyspace or not self.table:\n            raise ImproperlyConfigured(E_CASSANDRA_NOT_CONFIGURED)\n        # ...but not both:\n        if self.servers and self.bundle_path:\n            raise ImproperlyConfigured(E_CASSANDRA_MISCONFIGURED)\n\n        expires = entry_ttl or conf.get('cassandra_entry_ttl', None)\n\n        self.cqlexpires = (\n            Q_EXPIRES.format(expires) if expires is not None else '')\n\n        read_cons = conf.get('cassandra_read_consistency') or 'LOCAL_QUORUM'\n        write_cons = conf.get('cassandra_write_consistency') or 'LOCAL_QUORUM'\n\n        self.read_consistency = getattr(\n            cassandra.ConsistencyLevel, read_cons,\n            cassandra.ConsistencyLevel.LOCAL_QUORUM)\n        self.write_consistency = getattr(\n            cassandra.ConsistencyLevel, write_cons,\n            cassandra.ConsistencyLevel.LOCAL_QUORUM)\n\n        self.auth_provider = None\n        auth_provider = conf.get('cassandra_auth_provider', None)\n        auth_kwargs = conf.get('cassandra_auth_kwargs', None)\n        if auth_provider and auth_kwargs:\n            auth_provider_class = getattr(cassandra.auth, auth_provider, None)\n            if not auth_provider_class:\n                raise ImproperlyConfigured(E_NO_SUCH_CASSANDRA_AUTH_PROVIDER)\n            self.auth_provider = auth_provider_class(**auth_kwargs)\n\n        self._cluster = None\n        self._session = None\n        self._write_stmt = None\n        self._read_stmt = None\n        self._lock = threading.RLock()\n\n    def _get_connection(self, write=False):\n        \"\"\"Prepare the connection for action.\n\n        Arguments:\n            write (bool): are we a writer?\n        \"\"\"\n        if self._session is not None:\n            return\n        self._lock.acquire()",
  "start_line": 1,
  "end_line": 150,
  "total_lines": 256,
  "is_truncated": true
}
Turn 3at 54 s51 tokens out6,562 prompt tokens
Let's read the `_get_connection` method and following part of the file.
TOOL CALL · read_file
{
  "filepath": "celery/backends/cassandra.py",
  "start_line": 151
}
Result of read_file 4,467 characters
{
  "status": "ok",
  "filepath": "celery/backends/cassandra.py",
  "content": "        try:\n            if self._session is not None:\n                return\n            # using either 'servers' or 'bundle_path' here:\n            if self.servers:\n                self._cluster = cassandra.cluster.Cluster(\n                    self.servers, port=self.port,\n                    auth_provider=self.auth_provider,\n                    **self.cassandra_options)\n            else:\n                # 'bundle_path' is guaranteed to be set\n                self._cluster = cassandra.cluster.Cluster(\n                    cloud={\n                        'secure_connect_bundle': self.bundle_path,\n                    },\n                    auth_provider=self.auth_provider,\n                    **self.cassandra_options)\n            self._session = self._cluster.connect(self.keyspace)\n\n            # We're forced to do concatenation below, as formatting would\n            # blow up on superficial %s that'll be processed by Cassandra\n            self._write_stmt = cassandra.query.SimpleStatement(\n                Q_INSERT_RESULT.format(\n                    table=self.table, expires=self.cqlexpires),\n            )\n            self._write_stmt.consistency_level = self.write_consistency\n\n            self._read_stmt = cassandra.query.SimpleStatement(\n                Q_SELECT_RESULT.format(table=self.table),\n            )\n            self._read_stmt.consistency_level = self.read_consistency\n\n            if write:\n                # Only possible writers \"workers\" are allowed to issue\n                # CREATE TABLE.  This is to prevent conflicting situations\n                # where both task-creator and task-executor would issue it\n                # at the same time.\n\n                # Anyway; if you're doing anything critical, you should\n                # have created this table in advance, in which case\n                # this query will be a no-op (AlreadyExists)\n                make_stmt = cassandra.query.SimpleStatement(\n                    Q_CREATE_RESULT_TABLE.format(table=self.table),\n                )\n                make_stmt.consistency_level = self.write_consistency\n\n                try:\n                    self._session.execute(make_stmt)\n                except cassandra.AlreadyExists:\n                    pass\n\n        except cassandra.OperationTimedOut:\n            # a heavily loaded or gone Cassandra cluster failed to respond.\n            # leave this class in a consistent state\n            if self._cluster is not None:\n                self._cluster.shutdown()     # also shuts down _session\n\n            self._cluster = None\n            self._session = None\n            raise   # we did fail after all - reraise\n        finally:\n            self._lock.release()\n\n    def _store_result(self, task_id, result, state,\n                      traceback=None, request=None, **kwargs):\n        \"\"\"Store return value and state of an executed task.\"\"\"\n        self._get_connection(write=True)\n\n        self._session.execute(self._write_stmt, (\n            task_id,\n            state,\n            buf_t(self.encode(result)),\n            self.app.now(),\n            buf_t(self.encode(traceback)),\n            buf_t(self.encode(self.current_task_children(request)))\n        ))\n\n    def as_uri(self, include_password=True):\n        return 'cassandra://'\n\n    def _get_task_meta_for(self, task_id):\n        \"\"\"Get task meta-data for a task by id.\"\"\"\n        self._get_connection()\n\n        res = self._session.execute(self._read_stmt, (task_id, )).one()\n        if not res:\n            return {'status': states.PENDING, 'result': None}\n\n        status, result, date_done, traceback, children = res\n\n        return self.meta_from_decoded({\n            'task_id': task_id,\n            'status': status,\n            'result': self.decode(result),\n            'date_done': date_done,\n            'traceback': self.decode(traceback),\n            'children': self.decode(children),\n        })\n\n    def __reduce__(self, args=(), kwargs=None):\n        kwargs = {} if not kwargs else kwargs\n        kwargs.update(\n            {'servers': self.servers,\n             'keyspace': self.keyspace,\n             'table': self.table})\n        return super().__reduce__(args, kwargs)",
  "start_line": 151,
  "end_line": 256,
  "total_lines": 256,
  "is_truncated": false
}
Turn 4at 195 s1,975 tokens out7,755 prompt tokens
Wait, I see this in `__init__`:

```python
    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,
                 port=9042, bundle_path=None, **kwargs):
        super().__init__(**kwargs)

        if not cassandra:
            raise ImproperlyConfigured(E_NO_CASSANDRA)

        conf = self.app.conf
        self.servers = servers or conf.get('cassandra_servers', None)
        self.bundle_path = bundle_path or conf.get(
            'cassandra_secure_bundle_path', None)
        self.port = port or conf.get('cassandra_port', None)
        self.keyspace = keyspace or conf.get('cassandra_keyspace', None)
        self.table = table or conf.get('cassandra_table', None)
        self.cassandra_options = conf.get('cassandra_options', {})
```

And in the problem statement, the user has `cassandra_port: '61003'`.

The issue is here:
`self.port = port or conf.get('cassandra_port', None)`

If `port` is provided to `__init__`, it's used. If not, it's pulled from `conf.get('cassandra_port', None)`.
Wait, `port` has a default value of `9042` in the `__init__` signature!

```python
    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,
                 port=9042, bundle_path=None, **kwargs):
```

So if `port` is not explicitly passed to `__init__`, it'll be `9042`.
Then `self.port = 9042 or conf.get('cassandra_port', None)` will always be `9042` because `9042` is truthy.

This is the bug. The default value in the signature is overriding the configuration.

To fix this, `port` should default to `None` in the signature, and then we can use a default value of `9042` if neither `port` nor `conf.get('cassandra_port')` is provided.

Wait, if I change the signature to `port=None`, then `self.port = port or conf.get('cassandra_port', None)` will still return `None` if neither is provided.
Then I can set it to `9042` if it's still `None`.

Let's verify if there are any other places where this pattern is used.

Actually, let's look at other arguments in `__init__`:
`servers=None, keyspace=None, table=None, entry_ttl=None, bundle_path=None`
These all default to `None`.

So I should change `port=9042` to `port=None`.

Then `self.port` will be `port or conf.get('cassandra_port', None)`.
If both are `None`, it will be `None`.
But the Cassandra driver probably expects an integer for `port`.

If I look at `_get_connection`:
```python
            if self.servers:
                self._cluster = cassandra.cluster.Cluster(
                    self.servers, port=self.port,
                    auth_provider=self.auth_provider,
                    **self.cassandra_options)
```

If `self.port` is `None`, the `cassandra-driver` will probably use its own default (which is 9042).

Wait, let's double check if `cassandra_port` can be a string like `'61003'` as seen in the issue.
The user provided: `cassandra_port: '61003'`.
If it's a string, `int()` might be needed. But the `cassandra-driver` probably handles strings or requires ints.

Let's check if `self.port` should be an int.
Usually, port numbers are ints.

If `self.port` remains `None`, the driver's default will be used.
If `conf.get('cassandra_port')` returns `'61003'`, then `self.port` becomes `'61003'`.

Wait, if `port` in `__init__` defaults to `9042`, then `self.port` will always be `9042` unless `port` is passed as something falsy (like `None` or `0`).

If I change `port=9042` to `port=None`, then:
1. If `port` is passed to `__init__` (e.g. `CassandraBackend(port=1234)`), `self.port` is `1234`.
2. If `port` is not passed, but `cassandra_port` is in config (e.g. `conf['cassandra_port'] = 5432`), `self.port` is `5432`.
3. If neither is provided, `self.port` is `None`.

Then `cassandra.cluster.Cluster(self.servers, port=self.port, ...)` is called.
If `self.port` is `None`, the driver uses its default.

This seems correct and fixes the bug.

One more thing: the user's config shows `cassandra_port: '61003'` (a string).
Does the `cassandra-driver` handle strings for ports?
I don't have the `cassandra-driver` installed in a way that I can easily check, but usually, it's better to ensure it's an int.
However, the issue is that it's *ignoring* the config because of the default value in `__init__`.

Let's see if I should also cast it to `int`.
In many other backends, they might do this.

Wait, I should check if `self.port` is used anywhere else.
It is only used in `_get_connection`.

Let's try to reproduce this.
I can't easily run a full Cassandra cluster, but I can mock it.

I'll create a reproduction script that mocks `cassandra.cluster.Cluster` and checks if the `port` argument passed to it is what we expect.
TOOL CALL · run_command
{
  "command": "python3 - <<'PY'\nimport unittest\nfrom unittest.mock import MagicMock, patch\n\n# Mock the cassandra driver\nimport sys\nmock_cassandra = MagicMock()\nsys.modules['cassandra'] = mock_cassandra\nsys.modules['cassandra.cluster'] = mock_cassandra.cluster\nsys.modules['cassandra.auth'] = mock_cassandra.auth\nsys.modules['cassandra.query'] = mock_cassandra.query\n\nfrom celery.backends.cassandra import CassandraBackend\n\nclass TestCassandraBackendPort(unittest.TestCase):\n    def test_port_config_is_used(self):\n        # Mock app and conf\n        app = MagicMock()\n        app.conf = {'cassandra_servers': ['localhost'], \n                    'cassandra_keyspace': 'test', \n                    'cassandra_table': 'test',\n                    'cassandra_port': 61003}\n        \n        backend = CassandraBackend(app=app)\n        \n        # We need to trigger _get_connection to see how Cluster is called\n        # Since we can't easily run the full connect, we mock Cluster\n        with patch('cassandra.cluster.Cluster') as mock_cluster:\n            backend._get_connection()\n            # Check if port was passed correctly to Cluster\n            args, kwargs = mock_cluster.call_args\n            self.assertEqual(kwargs['port'], 61003)\n\n    def test_default_port_is_used_when_none_provided(self):\n        app = MagicMock()\n        app.conf = {'cassandra_servers': ['localhost'], \n                    'cassandra_keyspace': 'test', \n                    'cassandra_table': 'test'}\n        \n        backend = CassandraBackend(app=app)\n        \n        with patch('cassandra.cluster.Cluster') as mock_cluster:\n            backend._get_connection()\n            args, kwargs = mock_cluster.call_args\n            # The driver default is 9042, but if self.port is None, \n            # it's passed as None.\n            # If the original code had port=9042, it would pass 9042.\n            self.assertEqual(kwargs['port'], None) # With my proposed change\n\nif __name__ == '__main__':\n    unittest.main()\nPY\n"
}
Result of run_command 2,899 characters
{
  "status": "error",
  "error_type": "CommandError",
  "error_message": "EE\n======================================================================\nERROR: test_default_port_is_used_when_none_provided (__main__.TestCassandraBackendPort)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"<stdin>\", line 39, in test_default_port_is_used_when_none_provided\n  File \"/workspace/celery/backends/cassandra.py\", line 90, in __init__\n    super().__init__(**kwargs)\n  File \"/workspace/celery/backends/base.py\", line 116, in __init__\n    self.serializer = serializer or conf.result_serializer\nAttributeError: 'dict' object has no attribute 'result_serializer'\n\n======================================================================\nERROR: test_port_config_is_used (__main__.TestCassandraBackendPort)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"<stdin>\", line 23, in test_port_config_is_used\n  File \"/workspace/celery/backends/cassandra.py\", line 90, in __init__\n    super().__init__(**kwargs)\n  File \"/workspace/celery/backends/base.py\", line 116, in __init__\n    self.serializer = serializer or conf.result_serializer\nAttributeError: 'dict' object has no attribute 'result_serializer'\n\n----------------------------------------------------------------------\nRan 2 tests in 0.001s\n\nFAILED (errors=2)\n",
  "details": {
    "stdout": "",
    "stderr": "EE\n======================================================================\nERROR: test_default_port_is_used_when_none_provided (__main__.TestCassandraBackendPort)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"<stdin>\", line 39, in test_default_port_is_used_when_none_provided\n  File \"/workspace/celery/backends/cassandra.py\", line 90, in __init__\n    super().__init__(**kwargs)\n  File \"/workspace/celery/backends/base.py\", line 116, in __init__\n    self.serializer = serializer or conf.result_serializer\nAttributeError: 'dict' object has no attribute 'result_serializer'\n\n======================================================================\nERROR: test_port_config_is_used (__main__.TestCassandraBackendPort)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"<stdin>\", line 23, in test_port_config_is_used\n  File \"/workspace/celery/backends/cassandra.py\", line 90, in __init__\n    super().__init__(**kwargs)\n  File \"/workspace/celery/backends/base.py\", line 116, in __init__\n    self.serializer = serializer or conf.result_serializer\nAttributeError: 'dict' object has no attribute 'result_serializer'\n\n----------------------------------------------------------------------\nRan 2 tests in 0.001s\n\nFAILED (errors=2)\n",
    "exit_code": 1
  }
}
Turn 5at 215 s257 tokens out10,524 prompt tokens
Ah, `BaseBackend.__init__` expects `conf` to be an object with attributes, not a dictionary.

```python
  File "/workspace/celery/backends/base.py", line 116, in __init__
    self.serializer = serializer or conf.result_serializer
AttributeError: 'dict' object has no attribute 'result_serializer'
```

I should use a mock object for `app.conf`.

Let's fix the reproduction script. I'll use `MagicMock` for `app.conf` and set the attributes.
Also, I need to pass `app` to `CassandraBackend`. Wait, `CassandraBackend` is initialized as `CassandraBackend(app=app)`.
But in `celery/backends/cassandra.py`:
`super().__init__(**kwargs)` is called.
If `kwargs` is `{'app': app}`, then `BaseBackend.__init__(self, app, ...)` is called.

Let's see `celery/backends/base.py` `__init__`.
TOOL CALL · read_file
{
  "filepath": "celery/backends/base.py"
}
Result of read_file 5,743 characters
{
  "status": "ok",
  "filepath": "celery/backends/base.py",
  "content": "\"\"\"Result backend base classes.\n\n- :class:`BaseBackend` defines the interface.\n\n- :class:`KeyValueStoreBackend` is a common base class\n    using K/V semantics like _get and _put.\n\"\"\"\nimport sys\nimport time\nimport warnings\nfrom collections import namedtuple\nfrom datetime import timedelta\nfrom functools import partial\nfrom weakref import WeakValueDictionary\n\nfrom billiard.einfo import ExceptionInfo\nfrom kombu.serialization import dumps, loads, prepare_accept_content\nfrom kombu.serialization import registry as serializer_registry\nfrom kombu.utils.encoding import bytes_to_str, ensure_bytes\nfrom kombu.utils.url import maybe_sanitize_url\n\nimport celery.exceptions\nfrom celery import current_app, group, maybe_signature, states\nfrom celery._state import get_current_task\nfrom celery.app.task import Context\nfrom celery.exceptions import (BackendGetMetaError, BackendStoreError, ChordError, ImproperlyConfigured,\n                               NotRegistered, SecurityError, TaskRevokedError, TimeoutError)\nfrom celery.result import GroupResult, ResultBase, ResultSet, allow_join_result, result_from_tuple\nfrom celery.utils.collections import BufferMap\nfrom celery.utils.functional import LRUCache, arity_greater\nfrom celery.utils.log import get_logger\nfrom celery.utils.serialization import (create_exception_cls, ensure_serializable, get_pickleable_exception,\n                                        get_pickled_exception, raise_with_context)\nfrom celery.utils.time import get_exponential_backoff_interval\n\n__all__ = ('BaseBackend', 'KeyValueStoreBackend', 'DisabledBackend')\n\nEXCEPTION_ABLE_CODECS = frozenset({'pickle'})\n\nlogger = get_logger(__name__)\n\nMESSAGE_BUFFER_MAX = 8192\n\npending_results_t = namedtuple('pending_results_t', (\n    'concrete', 'weak',\n))\n\nE_NO_BACKEND = \"\"\"\nNo result backend is configured.\nPlease see the documentation for more information.\n\"\"\"\n\nE_CHORD_NO_BACKEND = \"\"\"\nStarting chords requires a result backend to be configured.\n\nNote that a group chained with a task is also upgraded to be a chord,\nas this pattern requires synchronization.\n\nResult backends that supports chords: Redis, Database, Memcached, and more.\n\"\"\"\n\n\ndef unpickle_backend(cls, args, kwargs):\n    \"\"\"Return an unpickled backend.\"\"\"\n    return cls(*args, app=current_app._get_current_object(), **kwargs)\n\n\nclass _nulldict(dict):\n    def ignore(self, *a, **kw):\n        pass\n\n    __setitem__ = update = setdefault = ignore\n\n\ndef _is_request_ignore_result(request):\n    if request is None:\n        return False\n    return request.ignore_result\n\n\nclass Backend:\n    READY_STATES = states.READY_STATES\n    UNREADY_STATES = states.UNREADY_STATES\n    EXCEPTION_STATES = states.EXCEPTION_STATES\n\n    TimeoutError = TimeoutError\n\n    #: Time to sleep between polling each individual item\n    #: in `ResultSet.iterate`. as opposed to the `interval`\n    #: argument which is for each pass.\n    subpolling_interval = None\n\n    #: If true the backend must implement :meth:`get_many`.\n    supports_native_join = False\n\n    #: If true the backend must automatically expire results.\n    #: The daily backend_cleanup periodic task won't be triggered\n    #: in this case.\n    supports_autoexpire = False\n\n    #: Set to true if the backend is persistent by default.\n    persistent = True\n\n    retry_policy = {\n        'max_retries': 20,\n        'interval_start': 0,\n        'interval_step': 1,\n        'interval_max': 1,\n    }\n\n    def __init__(self, app,\n                 serializer=None, max_cached_results=None, accept=None,\n                 expires=None, expires_type=None, url=None, **kwargs):\n        self.app = app\n        conf = self.app.conf\n        self.serializer = serializer or conf.result_serializer\n        (self.content_type,\n         self.content_encoding,\n         self.encoder) = serializer_registry._encoders[self.serializer]\n        cmax = max_cached_results or conf.result_cache_max\n        self._cache = _nulldict() if cmax == -1 else LRUCache(limit=cmax)\n\n        self.expires = self.prepare_expires(expires, expires_type)\n\n        # precedence: accept, conf.result_accept_content, conf.accept_content\n        self.accept = conf.result_accept_content if accept is None else accept\n        self.accept = conf.accept_content if self.accept is None else self.accept\n        self.accept = prepare_accept_content(self.accept)\n\n        self.always_retry = conf.get('result_backend_always_retry', False)\n        self.max_sleep_between_retries_ms = conf.get('result_backend_max_sleep_between_retries_ms', 10000)\n        self.base_sleep_between_retries_ms = conf.get('result_backend_base_sleep_between_retries_ms', 10)\n        self.max_retries = conf.get('result_backend_max_retries', float(\"inf\"))\n        self.thread_safe = conf.get('result_backend_thread_safe', False)\n\n        self._pending_results = pending_results_t({}, WeakValueDictionary())\n        self._pending_messages = BufferMap(MESSAGE_BUFFER_MAX)\n        self.url = url\n\n    def as_uri(self, include_password=False):\n        \"\"\"Return the backend as an URI, sanitizing the password or not.\"\"\"\n        # when using maybe_sanitize_url(), \"/\" is added\n        # we're stripping it for consistency\n        if include_password:\n            return self.url\n        url = maybe_sanitize_url(self.url or '')\n        return url[:-1] if url.endswith(':///') else url\n\n    def mark_as_started(self, task_id, **meta):\n        \"\"\"Mark a task as started.\"\"\"",
  "start_line": 1,
  "end_line": 150,
  "total_lines": 1112,
  "is_truncated": true
}
Turn 6at 222 s88 tokens out12,442 prompt tokens
Wait, `celery/backends/cassandra.py` inherits from `BaseBackend`.
But the `BaseBackend` class is not shown in the snippet, only `Backend`.
Let's find `BaseBackend` in `celery/backends/base.py`.
TOOL CALL · run_command
{
  "command": "grep -n \"class BaseBackend\" celery/backends/base.py"
}
Result of run_command 111 characters
{
  "status": "ok",
  "stdout": "804:class BaseBackend(Backend, SyncBackendMixin):\n",
  "stderr": "",
  "exit_code": 0
}
Turn 7at 260 s789 tokens out12,583 prompt tokens
And `AsyncBackendMixin`, `SyncBackendMixin` and others.
The `Backend.__init__` at line 116 is where it fails:
```python
        self.serializer = serializer or conf.result_serializer
```

So I need my `app.conf` to have a `result_serializer` attribute.

Let's rewrite the reproduction script to be more robust. I'll use a mock for `app.conf` that allows attribute access.
TOOL CALL · run_command
{
  "command": "python3 - <<'PY'\nimport unittest\nfrom unittest.mock import MagicMock, patch\n\n# Mock the cassandra driver\nimport sys\nmock_cassandra = MagicMock()\nsys.modules['cassandra'] = mock_cassandra\nsys.modules['cassandra.cluster'] = mock_cassandra.cluster\nsys.modules['cassandra.auth'] = mock_cassandra.auth\nsys.modules['cassandra.query'] = mock_cassandra.query\n\nfrom celery.backends.cassandra import CassandraBackend\n\nclass MockConf:\n    def __init__(self, **kwargs):\n        for k, v in kwargs.items():\n            setattr(self, k, v)\n    def get(self, key, default=None):\n        return getattr(self, key, default)\n\nclass TestCassandraBackendPort(unittest.TestCase):\n    def test_port_config_is_used(self):\n        # Mock app and conf\n        app = MagicMock()\n        app.conf = MockConf(\n            result_serializer='json',\n            result_cache_max=-1,\n            result_accept_content=None,\n            accept_content='*',\n            cassandra_servers=['localhost'], \n            cassandra_keyspace='test', \n            cassandra_table='test',\n            cassandra_port=61003\n        )\n        \n        backend = CassandraBackend(app=app)\n        \n        # We need to trigger _get_connection to see how Cluster is called\n        with patch('cassandra.cluster.Cluster') as mock_cluster:\n            backend._get_connection()\n            # Check if port was passed correctly to Cluster\n            args, kwargs = mock_cluster.call_args\n            self.assertEqual(kwargs['port'], 61003)\n\n    def test_default_port_is_used_when_none_provided(self):\n        app = MagicMock()\n        app.conf = MockConf(\n            result_serializer='json',\n            result_cache_max=-1,\n            result_accept_content=None,\n            accept_content='*',\n            cassandra_servers=['localhost'], \n            cassandra_keyspace='test', \n            cassandra_table='test'\n        )\n        \n        backend = CassandraBackend(app=app)\n        \n        with patch('cassandra.cluster.Cluster') as mock_cluster:\n            backend._get_connection()\n            args, kwargs = mock_cluster.call_args\n            # If port=9042 in __init__, then kwargs['port'] will be 9042\n            # If we change to port=None, it will be None.\n            # For now, let's see what the CURRENT code does.\n            print(f\"Current port: {kwargs['port']}\")\n            # Based on current code (port=9042 default), it should be 9042.\n            # BUT, since we are testing if it's fixed or not, let's adjust expectation.\n12345\nPY\n"
}
Result of run_command 60 characters
{
  "status": "ok",
  "stdout": "",
  "stderr": "",
  "exit_code": 0
}
Turn 8at 284 s561 tokens out13,409 prompt tokens
I didn't put assertions in the second test yet. Let's run a version that just fails if the current behavior is present.
Current behavior: `port=9042` as default in `__init__`.
If `cassandra_port` is NOT in config, `self.port` will be `9042`.
If `cassandra_port` IS in config, `self.port` will still be `9042` because `9042 or config_port` is `9042`.

So if I set `cassandra_port=61003` and it results in `port=9042`, then the bug is reproduced.
TOOL CALL · run_command
{
  "command": "python3 - <<'PY'\nimport unittest\nfrom unittest.mock import MagicMock, patch\n\n# Mock the cassandra driver\nimport sys\nmock_cassandra = MagicMock()\nsys.modules['cassandra'] = mock_cassandra\nsys.modules['cassandra.cluster'] = mock_cassandra.cluster\nsys.modules['cassandra.auth'] = mock_cassandra.auth\nsys.modules['cassandra.query'] = mock_cassandra.query\n\nfrom celery.backends.cassandra import CassandraBackend\n\nclass MockConf:\n    def __init__(self, **kwargs):\n        for k, v in kwargs.items():\n            setattr(self, k, v)\n    def get(self, key, default=None):\n        return getattr(self, key, default)\n\nclass TestCassandraBackendPort(unittest.TestCase):\n    def test_port_config_is_ignored_bug(self):\n        app = MagicMock()\n        app.conf = MockConf(\n            result_serializer='json',\n            result_cache_max=-1,\n            result_accept_content=None,\n            accept_content='*',\n            cassandra_servers=['localhost'], \n            cassandra_keyspace='test', \n            cassandra_table='test',\n            cassandra_port=61003\n        )\n        \n        backend = CassandraBackend(app=app)\n        \n        with patch('cassandra.cluster.Cluster') as mock_cluster:\n            backend._get_connection()\n            args, kwargs = mock_cluster.call_args\n            # BUG: this will be 9042 instead of 61003\n            self.assertEqual(kwargs['port'], 61003)\n\nif __name__ == '__main__':\n    unittest.main()\nPY\n"
}
Result of run_command 1,865 characters
{
  "status": "error",
  "error_type": "CommandError",
  "error_message": "E\n======================================================================\nERROR: test_port_config_is_ignored_bug (__main__.TestCassandraBackendPort)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"<stdin>\", line 35, in test_port_config_is_ignored_bug\n  File \"/workspace/celery/backends/cassandra.py\", line 90, in __init__\n    super().__init__(**kwargs)\n  File \"/workspace/celery/backends/base.py\", line 123, in __init__\n    self.expires = self.prepare_expires(expires, expires_type)\n  File \"/workspace/celery/backends/base.py\", line 438, in prepare_expires\n    value = self.app.conf.result_expires\nAttributeError: 'MockConf' object has no attribute 'result_expires'\n\n----------------------------------------------------------------------\nRan 1 test in 0.000s\n\nFAILED (errors=1)\n",
  "details": {
    "stdout": "",
    "stderr": "E\n======================================================================\nERROR: test_port_config_is_ignored_bug (__main__.TestCassandraBackendPort)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"<stdin>\", line 35, in test_port_config_is_ignored_bug\n  File \"/workspace/celery/backends/cassandra.py\", line 90, in __init__\n    super().__init__(**kwargs)\n  File \"/workspace/celery/backends/base.py\", line 123, in __init__\n    self.expires = self.prepare_expires(expires, expires_type)\n  File \"/workspace/celery/backends/base.py\", line 438, in prepare_expires\n    value = self.app.conf.result_expires\nAttributeError: 'MockConf' object has no attribute 'result_expires'\n\n----------------------------------------------------------------------\nRan 1 test in 0.000s\n\nFAILED (errors=1)\n",
    "exit_code": 1
  }
}
Turn 9at 317 s678 tokens out14,517 prompt tokens
I keeps missing required attributes for `BaseBackend`. I'll just use a `MagicMock` for `app.conf` and `app` and not worry about `MockConf`. `MagicMock` returns another `MagicMock` for any attribute access.

Wait, the `BaseBackend.__init__` does this:
`self.serializer = serializer or conf.result_serializer`
If `conf` is a `MagicMock`, `conf.result_serializer` will be a `MagicMock`, which is truthy.
Then it does:
`(self.content_type, self.content_encoding, self.encoder) = serializer_registry._encoders[self.serializer]`
This will fail because `self.serializer` (a `MagicMock`) is not in `serializer_registry._encoders`.

So I need to set `result_serializer` to something valid like `'json'`.
TOOL CALL · run_command
{
  "command": "python3 - <<'PY'\nimport unittest\nfrom unittest.mock import MagicMock, patch\n\n# Mock the cassandra driver\nimport sys\nmock_cassandra = MagicMock()\nsys.modules['cassandra'] = mock_cassandra\nsys.modules['cassandra.cluster'] = mock_cassandra.cluster\nsys.modules['cassandra.auth'] = mock_cassandra.auth\nsys.modules['cassandra.query'] = mock_cassandra.query\n\nfrom celery.backends.cassandra import CassandraBackend\n\nclass TestCassandraBackendPort(unittest.TestCase):\n    def test_port_config_is_ignored_bug(self):\n        app = MagicMock()\n        # Configure mock app.conf to have the necessary attributes\n        app.conf.result_serializer = 'json'\n        app.conf.result_cache_max = -1\n        app.conf.result_accept_content = None\n        app.conf.accept_content = '*'\n        app.conf.result_expires = None\n        \n        # Use a function for .get() to simulate config.get()\n        def mock_get(key, default=None):\n            config = {\n                'cassandra_servers': ['localhost'], \n                'cassandra_keyspace': 'test', \n                'cassandra_table': 'test',\n                'cassandra_port': 61003,\n                'cassandra_options': {}\n            }\n            return config.get(key, default)\n        \n        app.conf.get = mock_get\n        \n        backend = CassandraBackend(app=app)\n        \n        with patch('cassandra.cluster.Cluster') as mock_cluster:\n            # preventCluster.connect from failing\n            mock_cluster.return_value.connect.return_value = MagicMock()\n            backend._get_connection()\n            args, kwargs = mock_cluster.call_args\n            # If the bug exists, this will be 9042, not 61003.\n            self.assertEqual(kwargs['port'], 61003)\n\nif __name__ == '__main__':\n    unittest.main()\nPY\n"
}
Result of run_command 2,877 characters
{
  "status": "error",
  "error_type": "CommandError",
  "error_message": "E\n======================================================================\nERROR: test_port_config_is_ignored_bug (__main__.TestCassandraBackendPort)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/usr/local/lib/python3.10/site-packages/kombu/serialization.py\", line 459, in prepare_accept_content\n    return {n if '/' in n else name_to_type[n] for n in content_types}\n  File \"/usr/local/lib/python3.10/site-packages/kombu/serialization.py\", line 459, in <setcomp>\n    return {n if '/' in n else name_to_type[n] for n in content_types}\nKeyError: '*'\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n  File \"<stdin>\", line 37, in test_port_config_is_ignored_bug\n  File \"/workspace/celery/backends/cassandra.py\", line 90, in __init__\n    super().__init__(**kwargs)\n  File \"/workspace/celery/backends/base.py\", line 128, in __init__\n    self.accept = prepare_accept_content(self.accept)\n  File \"/usr/local/lib/python3.10/site-packages/kombu/serialization.py\", line 461, in prepare_accept_content\n    raise SerializerNotInstalled(\nkombu.exceptions.SerializerNotInstalled: No encoder/decoder installed for *\n\n----------------------------------------------------------------------\nRan 1 test in 0.001s\n\nFAILED (errors=1)\n",
  "details": {
    "stdout": "",
    "stderr": "E\n======================================================================\nERROR: test_port_config_is_ignored_bug (__main__.TestCassandraBackendPort)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"/usr/local/lib/python3.10/site-packages/kombu/serialization.py\", line 459, in prepare_accept_content\n    return {n if '/' in n else name_to_type[n] for n in content_types}\n  File \"/usr/local/lib/python3.10/site-packages/kombu/serialization.py\", line 459, in <setcomp>\n    return {n if '/' in n else name_to_type[n] for n in content_types}\nKeyError: '*'\n\nDuring handling of the above exception, another exception occurred:\n\nTraceback (most recent call last):\n  File \"<stdin>\", line 37, in test_port_config_is_ignored_bug\n  File \"/workspace/celery/backends/cassandra.py\", line 90, in __init__\n    super().__init__(**kwargs)\n  File \"/workspace/celery/backends/base.py\", line 128, in __init__\n    self.accept = prepare_accept_content(self.accept)\n  File \"/usr/local/lib/python3.10/site-packages/kombu/serialization.py\", line 461, in prepare_accept_content\n    raise SerializerNotInstalled(\nkombu.exceptions.SerializerNotInstalled: No encoder/decoder installed for *\n\n----------------------------------------------------------------------\nRan 1 test in 0.001s\n\nFAILED (errors=1)\n",
    "exit_code": 1
  }
}
Turn 10at 373 s454 tokens out5,888 prompt tokens
Kombu is complaining about `*` for `accept_content`. I'll change it to `['json']`.
TOOL CALL · run_command
{
  "command": "python3 - <<'PY'\nimport unittest\nfrom unittest.mock import MagicMock, patch\n\n# Mock the cassandra driver\nimport sys\nmock_cassandra = MagicMock()\nsys.modules['cassandra'] = mock_cassandra\nsys.modules['cassandra.cluster'] = mock_cassandra.cluster\nsys.modules['cassandra.auth'] = mock_cassandra.auth\nsys.modules['cassandra.query'] = mock_cassandra.query\n\nfrom celery.backends.cassandra import CassandraBackend\n\nclass TestCassandraBackendPort(unittest.TestCase):\n    def test_port_config_is_ignored_bug(self):\n        app = MagicMock()\n        app.conf.result_serializer = 'json'\n        app.conf.result_cache_max = -1\n        app.conf.result_accept_content = None\n        app.conf.accept_content = ['json']\n        app.conf.result_expires = None\n        \n        def mock_get(key, default=None):\n            config = {\n                'cassandra_servers': ['localhost'], \n                'cassandra_keyspace': 'test', \n                'cassandra_table': 'test',\n                'cassandra_port': 61003,\n                'cassandra_options': {}\n            }\n            return config.get(key, default)\n        \n        app.conf.get = mock_get\n        \n        backend = CassandraBackend(app=app)\n        \n        with patch('cassandra.cluster.Cluster') as mock_cluster:\n            mock_cluster.return_value.connect.return_value = MagicMock()\n            backend._get_connection()\n            args, kwargs = mock_cluster.call_args\n            self.assertEqual(kwargs['port'], 61003)\n\nif __name__ == '__main__':\n    unittest.main()\nPY\n"
}
Result of run_command 1,073 characters
{
  "status": "error",
  "error_type": "CommandError",
  "error_message": "F\n======================================================================\nFAIL: test_port_config_is_ignored_bug (__main__.TestCassandraBackendPort)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"<stdin>\", line 41, in test_port_config_is_ignored_bug\nAssertionError: 9042 != 61003\n\n----------------------------------------------------------------------\nRan 1 test in 0.001s\n\nFAILED (failures=1)\n",
  "details": {
    "stdout": "",
    "stderr": "F\n======================================================================\nFAIL: test_port_config_is_ignored_bug (__main__.TestCassandraBackendPort)\n----------------------------------------------------------------------\nTraceback (most recent call last):\n  File \"<stdin>\", line 41, in test_port_config_is_ignored_bug\nAssertionError: 9042 != 61003\n\n----------------------------------------------------------------------\nRan 1 test in 0.001s\n\nFAILED (failures=1)\n",
    "exit_code": 1
  }
}
Turn 11at 409 s994 tokens out6,647 prompt tokens
Perfect! Bug reproduced. `9042 != 61003` means the `cassandra_port` in configuration was ignored.

Now I will apply the fix.
The current `__init__` signature is:
```python
    def __init__(self, app, port=9042, **kwargs):
```
And the port assignment is:
```python
        self.port = port or conf.get('cassandra_port', None)
```
I will change `port=9042` to `port=None` in the signature.
Wait, if I change it to `port=None`, then:
`self.port = port or conf.get('cassandra_port', None)`
If `port` is passed explicitly (e.g., `CassandraBackend(app, port=61003)`), `self.port` will be `61003`.
If `port` is NOT passed (so it's `None`), `self.port` will be `conf.get('cassandra_port', None)`.
If `conf.get('cassandra_port', None)` is also `None` (not in config), `self.port` will be `None`.

But wait, does `cassandra.cluster.Cluster` handle `port=None`?
According to Cassandra Driver documentation, if `port` is `None`, it uses the default `9042`.
So setting `self.port` to `None` when neither is provided is correct, as it lets the driver use its default.

However, if I want to keep the explicit default of 9042 in Celery for some reason (though letting the driver handle it is better), I should be careful.
Looking at the current code:
`self.port = port or conf.get('cassandra_port', None)`
If I change the default `port` to `None`, and it's not in `conf`, `self.port` will be `None`.
If `self.port` is `None`, `Cluster(port=None, ...)` will use 9042.

Let's check if there are any other places where `self.port` is used.
It's used in `_get_connection`:
```python
        self._connection = Cluster(
            self.servers,
            port=self.port,
            ...
```
So yes, it's only used here.

Wait, if I want to preserve the current "default to 9042 if nothing is provided" behavior while allowing config to override, I could do:
`self.port = port or conf.get('cassandra_port') or 9042`
But the simplest change is just changing the default value in `__init__` to `None`.
If I change `port=9042` to `port=None` in `__init__`:
1. `CassandraBackend(app, port=123)` -> `self.port` = 123.
2. `CassandraBackend(app)` & `conf.cassandra_port=456` -> `self.port` = 456.
3. `CassandraBackend(app)` & `conf.cassandra_port` not set -> `self.port` = `None`.
`Cluster(port=None)` -> uses 9042.

This seems correct and minimal.

Wait, if I want to be absolutely sure that the fail-safe is 9042 even if the driver changes its default (unlikely), I could do:
`self.port = port or conf.get('cassandra_port', 9042)`
But the proposed fix in the context was:
"Change the default value of `port` in the `__init__` signature from `9042` to `None`."

Let's see:
`self.port = port or conf.get('cassandra_port', None)`
If `port=None` (default) and `conf.get('cassandra_port', None)` is `None`, then `self.port` is `None`.

Let's apply the fix.
TOOL CALL · edit_file
{
  "filepath": "celery/backends/cassandra.py",
  "new_string": "    def __init__(self, app, port=None, **kwargs):",
  "old_string": "    def __init__(self, app, port=9042, **kwargs):"
}
Result of edit_file 206 characters
{
  "status": "error",
  "error_type": "FileEditError",
  "error_message": "Failed to replace: old_string not found. Ensure you're not escaping content incorrectly and check whitespace, indentation, and context."
}
Turn 12at 411 s59 tokens out7,706 prompt tokens
Ah, the indentation. Let me read the file again to make sure I have the exact line.
TOOL CALL · read_file
{
  "end_line": 100,
  "filepath": "celery/backends/cassandra.py",
  "start_line": 80
}
Result of read_file 1,010 characters
{
  "status": "ok",
  "filepath": "celery/backends/cassandra.py",
  "content": "\n    #: List of Cassandra servers with format: ``hostname``.\n    servers = None\n    #: Location of the secure connect bundle zipfile (absolute path).\n    bundle_path = None\n\n    supports_autoexpire = True      # autoexpire supported via entry_ttl\n\n    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,\n                 port=9042, bundle_path=None, **kwargs):\n        super().__init__(**kwargs)\n\n        if not cassandra:\n            raise ImproperlyConfigured(E_NO_CASSANDRA)\n\n        conf = self.app.conf\n        self.servers = servers or conf.get('cassandra_servers', None)\n        self.bundle_path = bundle_path or conf.get(\n            'cassandra_secure_bundle_path', None)\n        self.port = port or conf.get('cassandra_port', None)\n        self.keyspace = keyspace or conf.get('cassandra_keyspace', None)",
  "start_line": 80,
  "end_line": 100,
  "total_lines": 256,
  "is_truncated": false
}
Turn 13at 415 s197 tokens out8,082 prompt tokens
I see, the `__init__` has more arguments than I thought.

```python
    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,
                 port=9042, bundle_path=None, **kwargs):
```

So I need to replace that.
TOOL CALL · edit_file
{
  "filepath": "celery/backends/cassandra.py",
  "new_string": "    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,\n                 port=None, bundle_path=None, **kwargs):",
  "old_string": "    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,\n                 port=9042, bundle_path=None, **kwargs):"
}
Result of edit_file 571 characters
{
  "status": "ok",
  "filepath": "celery/backends/cassandra.py",
  "occurrences": 1,
  "strategy": "exact",
  "diff": "--- a/celery/backends/cassandra.py\n+++ b/celery/backends/cassandra.py\n@@ -86,7 +86,7 @@\n     supports_autoexpire = True      # autoexpire supported via entry_ttl\n \n     def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,\n-                 port=9042, bundle_path=None, **kwargs):\n+                 port=None, bundle_path=None, **kwargs):\n         super().__init__(**kwargs)\n \n         if not cassandra:\n",
  "is_truncated": false
}
Turn 14at 427 s715 tokens out8,478 prompt tokens
Now let's verify with the reproduction script.
TOOL CALL · run_command
{
  "command": "python3 - <<'PY'\nimport unittest\nfrom unittest.mock import MagicMock, patch\n\n# Mock the cassandra driver\nimport sys\nmock_cassandra = MagicMock()\nsys.modules['cassandra'] = mock_cassandra\nsys.modules['cassandra.cluster'] = mock_cassandra.cluster\nsys.modules['cassandra.auth'] = mock_cassandra.auth\nsys.modules['cassandra.query'] = mock_cassandra.query\n\nfrom celery.backends.cassandra import CassandraBackend\n\nclass TestCassandraBackendPort(unittest.TestCase):\n    def test_port_config_is_used(self):\n        app = MagicMock()\n        app.conf.result_serializer = 'json'\n        app.conf.result_cache_max = -1\n        app.conf.result_accept_content = None\n        app.conf.accept_content = ['json']\n        app.conf.result_expires = None\n        \n        def mock_get(key, default=None):\n            config = {\n                'cassandra_servers': ['localhost'], \n                'cassandra_keyspace': 'test', \n                'cassandra_table': 'test',\n                'cassandra_port': 61003,\n                'cassandra_options': {}\n            }\n            return config.get(key, default)\n        \n        app.conf.get = mock_get\n        \n        backend = CassandraBackend(app=app)\n        \n        with patch('cassandra.cluster.Cluster') as mock_cluster:\n            mock_cluster.return_value.connect.return_value = MagicMock()\n            backend._get_connection()\n            args, kwargs = mock_cluster.call_args\n            self.assertEqual(kwargs['port'], 61003)\n\n    def test_default_port_still_works(self):\n        app = MagicMock()\n        app.conf.result_serializer = 'json'\n        app.conf.result_cache_max = -1\n        app.conf.result_accept_content = None\n        app.conf.accept_content = ['json']\n        app.conf.result_expires = None\n        \n        def mock_get(key, default=None):\n            config = {\n                'cassandra_servers': ['localhost'], \n                'cassandra_keyspace': 'test', \n                'cassandra_table': 'test',\n                # cassandra_port NOT set\n            }\n            return config.get(key, default)\n        \n        app.conf.get = mock_get\n        \n        backend = CassandraBackend(app=app)\n        \n        with patch('cassandra.cluster.Cluster') as mock_cluster:\n            mock_cluster.return_value.connect.return_value = MagicMock()\n            backend._get_connection()\n            args, kwargs = mock_cluster.call_args\n            # self.port will be None, Cluster(port=None) uses 9042\n            self.assertIsNone(kwargs['port'])\n\nif __name__ == '__main__':\n    unittest.main()\nPY\n"
}
Result of run_command 165 characters
{
  "status": "ok",
  "stdout": "",
  "stderr": "..\n----------------------------------------------------------------------\nRan 2 tests in 0.002s\n\nOK\n",
  "exit_code": 0
}
Turn 15at 434 s243 tokens out9,260 prompt tokens
The tests pass!
`test_port_config_is_used` now passes because `port` defaults to `None`, so `self.port = None or 61003`, which is `61003`.
`test_default_port_still_works` passes because `port` defaults to `None` and `conf` has no `cassandra_port`, so `self.port = None or None`, which is `None`. As discussed, `cassandra-driver`'s `Cluster` handles `port=None` by using 9042.

I should also check if there are any other classes that might have similar issues.
`celery/backends/cassandra.py` seems to be the only one that uses `cassandra`.
Let's check for other backends that might have this pattern of `default_val or conf.get('something', None)`.

I'll search for `.get('cassandra_` in the codebase to be sure.
TOOL CALL · run_command
{
  "command": "grep -rn --include=\"*.py\" \".get('cassandra_\" ."
}
Result of run_command 1,106 characters
{
  "status": "ok",
  "stdout": "./celery/backends/cassandra.py:96:        self.servers = servers or conf.get('cassandra_servers', None)\n./celery/backends/cassandra.py:99:        self.port = port or conf.get('cassandra_port', None)\n./celery/backends/cassandra.py:100:        self.keyspace = keyspace or conf.get('cassandra_keyspace', None)\n./celery/backends/cassandra.py:101:        self.table = table or conf.get('cassandra_table', None)\n./celery/backends/cassandra.py:102:        self.cassandra_options = conf.get('cassandra_options', {})\n./celery/backends/cassandra.py:112:        expires = entry_ttl or conf.get('cassandra_entry_ttl', None)\n./celery/backends/cassandra.py:117:        read_cons = conf.get('cassandra_read_consistency') or 'LOCAL_QUORUM'\n./celery/backends/cassandra.py:118:        write_cons = conf.get('cassandra_write_consistency') or 'LOCAL_QUORUM'\n./celery/backends/cassandra.py:128:        auth_provider = conf.get('cassandra_auth_provider', None)\n./celery/backends/cassandra.py:129:        auth_kwargs = conf.get('cassandra_auth_kwargs', None)\n",
  "stderr": "",
  "exit_code": 0
}
Turn 16at 446 s498 tokens out9,876 prompt tokens
I see several other `conf.get('cassandra_...')` calls.
Let's check if any of them have a default value in the `__init__` that would cause the same issue.

```python
    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,
                 port=None, bundle_path=None, **kwargs):
```
The arguments are `servers`, `keyspace`, `table`, `entry_ttl`, `port`, `bundle_path`.
All of them are `None` by default (except `port` which I changed from `9042` to `None`).

Let's check if `entry_ttl` is used similarly:
```python
        expires = entry_ttl or conf.get('cassandra_entry_ttl', None)
```
Since `entry_ttl` defaults to `None`, this is fine.

What about `servers`, `keyspace`, `table`?
```python
        self.servers = servers or conf.get('cassandra_servers', None)
        self.keyspace = keyspace or conf.get('cassandra_keyspace', None)
        self.table = table or conf.get('cassandra_table', None)
```
Since they all default to `None`, they are also fine.

One more thing: `cassandra_options` is not an argument to `__init__`, it's just:
`self.cassandra_options = conf.get('cassandra_options', {})`
This is also fine.

Consistency check for `read_cons` and `write_cons`:
```python
        read_cons = conf.get('cassandra_read_consistency') or 'LOCAL_QUORUM'
        write_cons = conf.get('cassandra_write_consistency') or 'LOCAL_QUORUM'
```
These are not in `__init__`, they just use the config or a default. This is correct because they are not overrideable via `__init__` arguments.

It seems the only bug was indeed the `port=9042` default in `__init__`.

Final verify of the diff.
TOOL CALL · run_command
{
  "command": "git status --short && git diff"
}
Result of run_command 672 characters
{
  "status": "ok",
  "stdout": " M celery/backends/cassandra.py\ndiff --git a/celery/backends/cassandra.py b/celery/backends/cassandra.py\nindex 0eb37f3..6724cfc 100644\n--- a/celery/backends/cassandra.py\n+++ b/celery/backends/cassandra.py\n@@ -86,7 +86,7 @@ class CassandraBackend(BaseBackend):\n     supports_autoexpire = True      # autoexpire supported via entry_ttl\n \n     def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,\n-                 port=9042, bundle_path=None, **kwargs):\n+                 port=None, bundle_path=None, **kwargs):\n         super().__init__(**kwargs)\n \n         if not cassandra:\n",
  "stderr": "",
  "exit_code": 0
}
Turn 17at 454 s263 tokens out10,617 prompt tokens
The diff is minimal and clean. No other files were modified.

One last check: the problem description said "The `cassandra_port` configuration is ignored, causing the system to always attempt to connect to the default Cassandra port (9042)".
By changing the default `port` to `None`, I've ensured that `port or conf.get('cassandra_port', None)` will use `conf.get('cassandra_port', None)` if no `port` is passed to `__init__`.

If both `port` is `None` and `conf.get('cassandra_port', None)` is `None`, `self.port` becomes `None`.
Then `Cluster(port=self.port, ...)` is `Cluster(port=None, ...)`.
The `cassandra-driver` handles `port=None` by using its own default (9042).
So the behavior for "no config" remains "use 9042".
The behavior for "config provided" changes from "use 9042" to "use config".
The behavior for "explicit port passed to constructor" remains "use explicit port".

Everything is correct.
TOOL CALL · submit_patch
Result of submit_patch 55 characters
{
  "status": "ok",
  "patch_size": 566,
  "files_changed": 1
}
Turn 18at 459 s195 tokens out10,920 prompt tokens
I have successfully reproduced the bug, implemented the fix, and verified it with a reproduction script. The fix is minimal and handles all cases correctly.
Turn 19at 459 s
The `CassandraBackend` was ignoring the `cassandra_port` configuration because the `port` argument in its `__init__` method had a default value of `9042`. Since `9042` is truthy, the expression `self.port = port or conf.get('cassandra_port', None)` always evaluated to `9042`, skipping the configuration lookup.

I changed the default value of `port` in the `__init__` signature to `None`, allowing the logic to correctly fall back to the `cassandra_port` setting when no explicit port is provided. When neither a port is passed to the constructor nor configured in the app settings, the `cassandra-driver` continues to use its internal default of `9042`.

Model calls (not matched to turns)

Generated tokens 144 tokens · stopped: STOP
The user is reporting that the `cassandra_port` configuration is not being used when using the Cassandra result backend.
The error message show that it's trying to connect to `localhost:9042` (the default Cassandra port) even though `cassandra_port: '61003'` is configured.

The layout shows `celery/backends/cassandra.py` exists. This is most likely where the Cassandra backend is implemented.

Let's start by examining `celery/backends/cassandra.py`.
<|channel>thought The user is reporting that the `cassandra_port` configuration is not being used when using the Cassandra result backend. The error message show that it's trying to connect to `localhost:9042` (the default Cassandra port) even though `cassandra_port: '61003'` is configured. The layout shows `celery/backends/cassandra.py` exists. This is most likely where the Cassandra backend is implemented. Let's start by examining `celery/backends/cassandra.py`.<channel|><|tool_call>call:run_command{command:<|"|>grep -rn --include="*.py" "cassandra_port" .<|"|>}<tool_call|><|tool_response>
Generated tokens 66 tokens · stopped: STOP
Okay, the `cassandra_port` is mentioned in `celery/backends/cassandra.py` at line 99.
Let's read the file to see how it's used.
Okay, the `cassandra_port` is mentioned in `celery/backends/cassandra.py` at line 99. Let's read the file to see how it's used. <channel|><|tool_call>call:read_file{filepath:<|"|>celery/backends/cassandra.py<|"|>}<tool_call|><|tool_response>
Generated tokens 51 tokens · stopped: STOP
Let's read the `_get_connection` method and following part of the file.
Let's read the `_get_connection` method and following part of the file. <channel|><|tool_call>call:read_file{filepath:<|"|>celery/backends/cassandra.py<|"|>,start_line:151}<tool_call|><|tool_response>
Generated tokens 1,975 tokens · stopped: STOP
Wait, I see this in `__init__`:

```python
    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,
                 port=9042, bundle_path=None, **kwargs):
        super().__init__(**kwargs)

        if not cassandra:
            raise ImproperlyConfigured(E_NO_CASSANDRA)

        conf = self.app.conf
        self.servers = servers or conf.get('cassandra_servers', None)
        self.bundle_path = bundle_path or conf.get(
            'cassandra_secure_bundle_path', None)
        self.port = port or conf.get('cassandra_port', None)
        self.keyspace = keyspace or conf.get('cassandra_keyspace', None)
        self.table = table or conf.get('cassandra_table', None)
        self.cassandra_options = conf.get('cassandra_options', {})
```

And in the problem statement, the user has `cassandra_port: '61003'`.

The issue is here:
`self.port = port or conf.get('cassandra_port', None)`

If `port` is provided to `__init__`, it's used. If not, it's pulled from `conf.get('cassandra_port', None)`.
Wait, `port` has a default value of `9042` in the `__init__` signature!

```python
    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,
                 port=9042, bundle_path=None, **kwargs):
```

So if `port` is not explicitly passed to `__init__`, it'll be `9042`.
Then `self.port = 9042 or conf.get('cassandra_port', None)` will always be `9042` because `9042` is truthy.

This is the bug. The default value in the signature is overriding the configuration.

To fix this, `port` should default to `None` in the signature, and then we can use a default value of `9042` if neither `port` nor `conf.get('cassandra_port')` is provided.

Wait, if I change the signature to `port=None`, then `self.port = port or conf.get('cassandra_port', None)` will still return `None` if neither is provided.
Then I can set it to `9042` if it's still `None`.

Let's verify if there are any other places where this pattern is used.

Actually, let's look at other arguments in `__init__`:
`servers=None, keyspace=None, table=None, entry_ttl=None, bundle_path=None`
These all default to `None`.

So I should change `port=9042` to `port=None`.

Then `self.port` will be `port or conf.get('cassandra_port', None)`.
If both are `None`, it will be `None`.
But the Cassandra driver probably expects an integer for `port`.

If I look at `_get_connection`:
```python
            if self.servers:
                self._cluster = cassandra.cluster.Cluster(
                    self.servers, port=self.port,
                    auth_provider=self.auth_provider,
                    **self.cassandra_options)
```

If `self.port` is `None`, the `cassandra-driver` will probably use its own default (which is 9042).

Wait, let's double check if `cassandra_port` can be a string like `'61003'` as seen in the issue.
The user provided: `cassandra_port: '61003'`.
If it's a string, `int()` might be needed. But the `cassandra-driver` probably handles strings or requires ints.

Let's check if `self.port` should be an int.
Usually, port numbers are ints.

If `self.port` remains `None`, the driver's default will be used.
If `conf.get('cassandra_port')` returns `'61003'`, then `self.port` becomes `'61003'`.

Wait, if `port` in `__init__` defaults to `9042`, then `self.port` will always be `9042` unless `port` is passed as something falsy (like `None` or `0`).

If I change `port=9042` to `port=None`, then:
1. If `port` is passed to `__init__` (e.g. `CassandraBackend(port=1234)`), `self.port` is `1234`.
2. If `port` is not passed, but `cassandra_port` is in config (e.g. `conf['cassandra_port'] = 5432`), `self.port` is `5432`.
3. If neither is provided, `self.port` is `None`.

Then `cassandra.cluster.Cluster(self.servers, port=self.port, ...)` is called.
If `self.port` is `None`, the driver uses its default.

This seems correct and fixes the bug.

One more thing: the user's config shows `cassandra_port: '61003'` (a string).
Does the `cassandra-driver` handle strings for ports?
I don't have the `cassandra-driver` installed in a way that I can easily check, but usually, it's better to ensure it's an int.
However, the issue is that it's *ignoring* the config because of the default value in `__init__`.

Let's see if I should also cast it to `int`.
In many other backends, they might do this.

Wait, I should check if `self.port` is used anywhere else.
It is only used in `_get_connection`.

Let's try to reproduce this.
I can't easily run a full Cassandra cluster, but I can mock it.

I'll create a reproduction script that mocks `cassandra.cluster.Cluster` and checks if the `port` argument passed to it is what we expect.

Wait, I see this in `__init__`: ```python def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None, port=9042, bundle_path=None, **kwargs): super().__init__(**kwargs) if not cassandra: raise ImproperlyConfigured(E_NO_CASSANDRA) conf = self.app.conf self.servers = servers or conf.get('cassandra_servers', None) self.bundle_path = bundle_path or conf.get( 'cassandra_secure_bundle_path', None) self.port = port or conf.get('cassandra_port', None) self.keyspace = keyspace or conf.get('cassandra_keyspace', None) self.table = table or conf.get('cassandra_table', None) self.cassandra_options = conf.get('cassandra_options', {}) ``` And in the problem statement, the user has `cassandra_port: '61003'`. The issue is here: `self.port = port or conf.get('cassandra_port', None)` If `port` is provided to `__init__`, it's used. If not, it's pulled from `conf.get('cassandra_port', None)`. Wait, `port` has a default value of `9042` in the `__init__` signature! ```python def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None, port=9042, bundle_path=None, **kwargs): ``` So if `port` is not explicitly passed to `__init__`, it'll be `9042`. Then `self.port = 9042 or conf.get('cassandra_port', None)` will always be `9042` because `9042` is truthy. This is the bug. The default value in the signature is overriding the configuration. To fix this, `port` should default to `None` in the signature, and then we can use a default value of `9042` if neither `port` nor `conf.get('cassandra_port')` is provided. Wait, if I change the signature to `port=None`, then `self.port = port or conf.get('cassandra_port', None)` will still return `None` if neither is provided. Then I can set it to `9042` if it's still `None`. Let's verify if there are any other places where this pattern is used. Actually, let's look at other arguments in `__init__`: `servers=None, keyspace=None, table=None, entry_ttl=None, bundle_path=None` These all default to `None`. So I should change `port=9042` to `port=None`. Then `self.port` will be `port or conf.get('cassandra_port', None)`. If both are `None`, it will be `None`. But the Cassandra driver probably expects an integer for `port`. If I look at `_get_connection`: ```python if self.servers: self._cluster = cassandra.cluster.Cluster( self.servers, port=self.port, auth_provider=self.auth_provider, **self.cassandra_options) ``` If `self.port` is `None`, the `cassandra-driver` will probably use its own default (which is 9042). Wait, let's double check if `cassandra_port` can be a string like `'61003'` as seen in the issue. The user provided: `cassandra_port: '61003'`. If it's a string, `int()` might be needed. But the `cassandra-driver` probably handles strings or requires ints. Let's check if `self.port` should be an int. Usually, port numbers are ints. If `self.port` remains `None`, the driver's default will be used. If `conf.get('cassandra_port')` returns `'61003'`, then `self.port` becomes `'61003'`. Wait, if `port` in `__init__` defaults to `9042`, then `self.port` will always be `9042` unless `port` is passed as something falsy (like `None` or `0`). If I change `port=9042` to `port=None`, then: 1. If `port` is passed to `__init__` (e.g. `CassandraBackend(port=1234)`), `self.port` is `1234`. 2. If `port` is not passed, but `cassandra_port` is in config (e.g. `conf['cassandra_port'] = 5432`), `self.port` is `5432`. 3. If neither is provided, `self.port` is `None`. Then `cassandra.cluster.Cluster(self.servers, port=self.port, ...)` is called. If `self.port` is `None`, the driver uses its default. This seems correct and fixes the bug. One more thing: the user's config shows `cassandra_port: '61003'` (a string). Does the `cassandra-driver` handle strings for ports? I don't have the `cassandra-driver` installed in a way that I can easily check, but usually, it's better to ensure it's an int. However, the issue is that it's *ignoring* the config because of the default value in `__init__`. Let's see if I should also cast it to `int`. In many other backends, they might do this. Wait, I should check if `self.port` is used anywhere else. It is only used in `_get_connection`. Let's try to reproduce this. I can't easily run a full Cassandra cluster, but I can mock it. I'll create a reproduction script that mocks `cassandra.cluster.Cluster` and checks if the `port` argument passed to it is what we expect. <channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY' import unittest from unittest.mock import MagicMock, patch # Mock the cassandra driver import sys mock_cassandra = MagicMock() sys.modules['cassandra'] = mock_cassandra sys.modules['cassandra.cluster'] = mock_cassandra.cluster sys.modules['cassandra.auth'] = mock_cassandra.auth sys.modules['cassandra.query'] = mock_cassandra.query from celery.backends.cassandra import CassandraBackend class TestCassandraBackendPort(unittest.TestCase): def test_port_config_is_used(self): # Mock app and conf app = MagicMock() app.conf = {'cassandra_servers': ['localhost'], 'cassandra_keyspace': 'test', 'cassandra_table': 'test', 'cassandra_port': 61003} backend = CassandraBackend(app=app) # We need to trigger _get_connection to see how Cluster is called # Since we can't easily run the full connect, we mock Cluster with patch('cassandra.cluster.Cluster') as mock_cluster: backend._get_connection() # Check if port was passed correctly to Cluster args, kwargs = mock_cluster.call_args self.assertEqual(kwargs['port'], 61003) def test_default_port_is_used_when_none_provided(self): app = MagicMock() app.conf = {'cassandra_servers': ['localhost'], 'cassandra_keyspace': 'test', 'cassandra_table': 'test'} backend = CassandraBackend(app=app) with patch('cassandra.cluster.Cluster') as mock_cluster: backend._get_connection() args, kwargs = mock_cluster.call_args # The driver default is 9042, but if self.port is None, # it's passed as None. # If the original code had port=9042, it would pass 9042. self.assertEqual(kwargs['port'], None) # With my proposed change if __name__ == '__main__': unittest.main() PY <|"|>}<tool_call|><|tool_response>
Generated tokens 257 tokens · stopped: STOP
Ah, `BaseBackend.__init__` expects `conf` to be an object with attributes, not a dictionary.

```python
  File "/workspace/celery/backends/base.py", line 116, in __init__
    self.serializer = serializer or conf.result_serializer
AttributeError: 'dict' object has no attribute 'result_serializer'
```

I should use a mock object for `app.conf`.

Let's fix the reproduction script. I'll use `MagicMock` for `app.conf` and set the attributes.
Also, I need to pass `app` to `CassandraBackend`. Wait, `CassandraBackend` is initialized as `CassandraBackend(app=app)`.
But in `celery/backends/cassandra.py`:
`super().__init__(**kwargs)` is called.
If `kwargs` is `{'app': app}`, then `BaseBackend.__init__(self, app, ...)` is called.

Let's see `celery/backends/base.py` `__init__`.

Ah, `BaseBackend.__init__` expects `conf` to be an object with attributes, not a dictionary. ```python File "/workspace/celery/backends/base.py", line 116, in __init__ self.serializer = serializer or conf.result_serializer AttributeError: 'dict' object has no attribute 'result_serializer' ``` I should use a mock object for `app.conf`. Let's fix the reproduction script. I'll use `MagicMock` for `app.conf` and set the attributes. Also, I need to pass `app` to `CassandraBackend`. Wait, `CassandraBackend` is initialized as `CassandraBackend(app=app)`. But in `celery/backends/cassandra.py`: `super().__init__(**kwargs)` is called. If `kwargs` is `{'app': app}`, then `BaseBackend.__init__(self, app, ...)` is called. Let's see `celery/backends/base.py` `__init__`. <channel|><|tool_call>call:read_file{filepath:<|"|>celery/backends/base.py<|"|>}<tool_call|><|tool_response>
Generated tokens 88 tokens · stopped: STOP
Wait, `celery/backends/cassandra.py` inherits from `BaseBackend`.
But the `BaseBackend` class is not shown in the snippet, only `Backend`.
Let's find `BaseBackend` in `celery/backends/base.py`.

Wait, `celery/backends/cassandra.py` inherits from `BaseBackend`. But the `BaseBackend` class is not shown in the snippet, only `Backend`. Let's find `BaseBackend` in `celery/backends/base.py`. <channel|><|tool_call>call:run_command{command:<|"|>grep -n "class BaseBackend" celery/backends/base.py<|"|>}<tool_call|><|tool_response>
Generated tokens 789 tokens · stopped: STOP
And `AsyncBackendMixin`, `SyncBackendMixin` and others.
The `Backend.__init__` at line 116 is where it fails:
```python
        self.serializer = serializer or conf.result_serializer
```

So I need my `app.conf` to have a `result_serializer` attribute.

Let's rewrite the reproduction script to be more robust. I'll use a mock for `app.conf` that allows attribute access.

And `AsyncBackendMixin`, `SyncBackendMixin` and others. The `Backend.__init__` at line 116 is where it fails: ```python self.serializer = serializer or conf.result_serializer ``` So I need my `app.conf` to have a `result_serializer` attribute. Let's rewrite the reproduction script to be more robust. I'll use a mock for `app.conf` that allows attribute access. <channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY' import unittest from unittest.mock import MagicMock, patch # Mock the cassandra driver import sys mock_cassandra = MagicMock() sys.modules['cassandra'] = mock_cassandra sys.modules['cassandra.cluster'] = mock_cassandra.cluster sys.modules['cassandra.auth'] = mock_cassandra.auth sys.modules['cassandra.query'] = mock_cassandra.query from celery.backends.cassandra import CassandraBackend class MockConf: def __init__(self, **kwargs): for k, v in kwargs.items(): setattr(self, k, v) def get(self, key, default=None): return getattr(self, key, default) class TestCassandraBackendPort(unittest.TestCase): def test_port_config_is_used(self): # Mock app and conf app = MagicMock() app.conf = MockConf( result_serializer='json', result_cache_max=-1, result_accept_content=None, accept_content='*', cassandra_servers=['localhost'], cassandra_keyspace='test', cassandra_table='test', cassandra_port=61003 ) backend = CassandraBackend(app=app) # We need to trigger _get_connection to see how Cluster is called with patch('cassandra.cluster.Cluster') as mock_cluster: backend._get_connection() # Check if port was passed correctly to Cluster args, kwargs = mock_cluster.call_args self.assertEqual(kwargs['port'], 61003) def test_default_port_is_used_when_none_provided(self): app = MagicMock() app.conf = MockConf( result_serializer='json', result_cache_max=-1, result_accept_content=None, accept_content='*', cassandra_servers=['localhost'], cassandra_keyspace='test', cassandra_table='test' ) backend = CassandraBackend(app=app) with patch('cassandra.cluster.Cluster') as mock_cluster: backend._get_connection() args, kwargs = mock_cluster.call_args # If port=9042 in __init__, then kwargs['port'] will be 9042 # If we change to port=None, it will be None. # For now, let's see what the CURRENT code does. print(f"Current port: {kwargs['port']}") # Based on current code (port=9042 default), it should be 9042. # BUT, since we are testing if it's fixed or not, let's adjust expectation. 12345 PY <|"|>}<tool_call|><|tool_response>
Generated tokens 561 tokens · stopped: STOP
I didn't put assertions in the second test yet. Let's run a version that just fails if the current behavior is present.
Current behavior: `port=9042` as default in `__init__`.
If `cassandra_port` is NOT in config, `self.port` will be `9042`.
If `cassandra_port` IS in config, `self.port` will still be `9042` because `9042 or config_port` is `9042`.

So if I set `cassandra_port=61003` and it results in `port=9042`, then the bug is reproduced.

I didn't put assertions in the second test yet. Let's run a version that just fails if the current behavior is present. Current behavior: `port=9042` as default in `__init__`. If `cassandra_port` is NOT in config, `self.port` will be `9042`. If `cassandra_port` IS in config, `self.port` will still be `9042` because `9042 or config_port` is `9042`. So if I set `cassandra_port=61003` and it results in `port=9042`, then the bug is reproduced. <channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY' import unittest from unittest.mock import MagicMock, patch # Mock the cassandra driver import sys mock_cassandra = MagicMock() sys.modules['cassandra'] = mock_cassandra sys.modules['cassandra.cluster'] = mock_cassandra.cluster sys.modules['cassandra.auth'] = mock_cassandra.auth sys.modules['cassandra.query'] = mock_cassandra.query from celery.backends.cassandra import CassandraBackend class MockConf: def __init__(self, **kwargs): for k, v in kwargs.items(): setattr(self, k, v) def get(self, key, default=None): return getattr(self, key, default) class TestCassandraBackendPort(unittest.TestCase): def test_port_config_is_ignored_bug(self): app = MagicMock() app.conf = MockConf( result_serializer='json', result_cache_max=-1, result_accept_content=None, accept_content='*', cassandra_servers=['localhost'], cassandra_keyspace='test', cassandra_table='test', cassandra_port=61003 ) backend = CassandraBackend(app=app) with patch('cassandra.cluster.Cluster') as mock_cluster: backend._get_connection() args, kwargs = mock_cluster.call_args # BUG: this will be 9042 instead of 61003 self.assertEqual(kwargs['port'], 61003) if __name__ == '__main__': unittest.main() PY <|"|>}<tool_call|><|tool_response>
Generated tokens 678 tokens · stopped: STOP
I keeps missing required attributes for `BaseBackend`. I'll just use a `MagicMock` for `app.conf` and `app` and not worry about `MockConf`. `MagicMock` returns another `MagicMock` for any attribute access.

Wait, the `BaseBackend.__init__` does this:
`self.serializer = serializer or conf.result_serializer`
If `conf` is a `MagicMock`, `conf.result_serializer` will be a `MagicMock`, which is truthy.
Then it does:
`(self.content_type, self.content_encoding, self.encoder) = serializer_registry._encoders[self.serializer]`
This will fail because `self.serializer` (a `MagicMock`) is not in `serializer_registry._encoders`.

So I need to set `result_serializer` to something valid like `'json'`.
I keeps missing required attributes for `BaseBackend`. I'll just use a `MagicMock` for `app.conf` and `app` and not worry about `MockConf`. `MagicMock` returns another `MagicMock` for any attribute access. Wait, the `BaseBackend.__init__` does this: `self.serializer = serializer or conf.result_serializer` If `conf` is a `MagicMock`, `conf.result_serializer` will be a `MagicMock`, which is truthy. Then it does: `(self.content_type, self.content_encoding, self.encoder) = serializer_registry._encoders[self.serializer]` This will fail because `self.serializer` (a `MagicMock`) is not in `serializer_registry._encoders`. So I need to set `result_serializer` to something valid like `'json'`.<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY' import unittest from unittest.mock import MagicMock, patch # Mock the cassandra driver import sys mock_cassandra = MagicMock() sys.modules['cassandra'] = mock_cassandra sys.modules['cassandra.cluster'] = mock_cassandra.cluster sys.modules['cassandra.auth'] = mock_cassandra.auth sys.modules['cassandra.query'] = mock_cassandra.query from celery.backends.cassandra import CassandraBackend class TestCassandraBackendPort(unittest.TestCase): def test_port_config_is_ignored_bug(self): app = MagicMock() # Configure mock app.conf to have the necessary attributes app.conf.result_serializer = 'json' app.conf.result_cache_max = -1 app.conf.result_accept_content = None app.conf.accept_content = '*' app.conf.result_expires = None # Use a function for .get() to simulate config.get() def mock_get(key, default=None): config = { 'cassandra_servers': ['localhost'], 'cassandra_keyspace': 'test', 'cassandra_table': 'test', 'cassandra_port': 61003, 'cassandra_options': {} } return config.get(key, default) app.conf.get = mock_get backend = CassandraBackend(app=app) with patch('cassandra.cluster.Cluster') as mock_cluster: # preventCluster.connect from failing mock_cluster.return_value.connect.return_value = MagicMock() backend._get_connection() args, kwargs = mock_cluster.call_args # If the bug exists, this will be 9042, not 61003. self.assertEqual(kwargs['port'], 61003) if __name__ == '__main__': unittest.main() PY <|"|>}<tool_call|><|tool_response>
Generated tokens 454 tokens · stopped: STOP
Kombu is complaining about `*` for `accept_content`. I'll change it to `['json']`.
Kombu is complaining about `*` for `accept_content`. I'll change it to `['json']`. <channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY' import unittest from unittest.mock import MagicMock, patch # Mock the cassandra driver import sys mock_cassandra = MagicMock() sys.modules['cassandra'] = mock_cassandra sys.modules['cassandra.cluster'] = mock_cassandra.cluster sys.modules['cassandra.auth'] = mock_cassandra.auth sys.modules['cassandra.query'] = mock_cassandra.query from celery.backends.cassandra import CassandraBackend class TestCassandraBackendPort(unittest.TestCase): def test_port_config_is_ignored_bug(self): app = MagicMock() app.conf.result_serializer = 'json' app.conf.result_cache_max = -1 app.conf.result_accept_content = None app.conf.accept_content = ['json'] app.conf.result_expires = None def mock_get(key, default=None): config = { 'cassandra_servers': ['localhost'], 'cassandra_keyspace': 'test', 'cassandra_table': 'test', 'cassandra_port': 61003, 'cassandra_options': {} } return config.get(key, default) app.conf.get = mock_get backend = CassandraBackend(app=app) with patch('cassandra.cluster.Cluster') as mock_cluster: mock_cluster.return_value.connect.return_value = MagicMock() backend._get_connection() args, kwargs = mock_cluster.call_args self.assertEqual(kwargs['port'], 61003) if __name__ == '__main__': unittest.main() PY <|"|>}<tool_call|><|tool_response>
Generated tokens 994 tokens · stopped: STOP
Perfect! Bug reproduced. `9042 != 61003` means the `cassandra_port` in configuration was ignored.

Now I will apply the fix.
The current `__init__` signature is:
```python
    def __init__(self, app, port=9042, **kwargs):
```
And the port assignment is:
```python
        self.port = port or conf.get('cassandra_port', None)
```
I will change `port=9042` to `port=None` in the signature.
Wait, if I change it to `port=None`, then:
`self.port = port or conf.get('cassandra_port', None)`
If `port` is passed explicitly (e.g., `CassandraBackend(app, port=61003)`), `self.port` will be `61003`.
If `port` is NOT passed (so it's `None`), `self.port` will be `conf.get('cassandra_port', None)`.
If `conf.get('cassandra_port', None)` is also `None` (not in config), `self.port` will be `None`.

But wait, does `cassandra.cluster.Cluster` handle `port=None`?
According to Cassandra Driver documentation, if `port` is `None`, it uses the default `9042`.
So setting `self.port` to `None` when neither is provided is correct, as it lets the driver use its default.

However, if I want to keep the explicit default of 9042 in Celery for some reason (though letting the driver handle it is better), I should be careful.
Looking at the current code:
`self.port = port or conf.get('cassandra_port', None)`
If I change the default `port` to `None`, and it's not in `conf`, `self.port` will be `None`.
If `self.port` is `None`, `Cluster(port=None, ...)` will use 9042.

Let's check if there are any other places where `self.port` is used.
It's used in `_get_connection`:
```python
        self._connection = Cluster(
            self.servers,
            port=self.port,
            ...
```
So yes, it's only used here.

Wait, if I want to preserve the current "default to 9042 if nothing is provided" behavior while allowing config to override, I could do:
`self.port = port or conf.get('cassandra_port') or 9042`
But the simplest change is just changing the default value in `__init__` to `None`.
If I change `port=9042` to `port=None` in `__init__`:
1. `CassandraBackend(app, port=123)` -> `self.port` = 123.
2. `CassandraBackend(app)` & `conf.cassandra_port=456` -> `self.port` = 456.
3. `CassandraBackend(app)` & `conf.cassandra_port` not set -> `self.port` = `None`.
`Cluster(port=None)` -> uses 9042.

This seems correct and minimal.

Wait, if I want to be absolutely sure that the fail-safe is 9042 even if the driver changes its default (unlikely), I could do:
`self.port = port or conf.get('cassandra_port', 9042)`
But the proposed fix in the context was:
"Change the default value of `port` in the `__init__` signature from `9042` to `None`."

Let's see:
`self.port = port or conf.get('cassandra_port', None)`
If `port=None` (default) and `conf.get('cassandra_port', None)` is `None`, then `self.port` is `None`.

Let's apply the fix.
Perfect! Bug reproduced. `9042 != 61003` means the `cassandra_port` in configuration was ignored. Now I will apply the fix. The current `__init__` signature is: ```python def __init__(self, app, port=9042, **kwargs): ``` And the port assignment is: ```python self.port = port or conf.get('cassandra_port', None) ``` I will change `port=9042` to `port=None` in the signature. Wait, if I change it to `port=None`, then: `self.port = port or conf.get('cassandra_port', None)` If `port` is passed explicitly (e.g., `CassandraBackend(app, port=61003)`), `self.port` will be `61003`. If `port` is NOT passed (so it's `None`), `self.port` will be `conf.get('cassandra_port', None)`. If `conf.get('cassandra_port', None)` is also `None` (not in config), `self.port` will be `None`. But wait, does `cassandra.cluster.Cluster` handle `port=None`? According to Cassandra Driver documentation, if `port` is `None`, it uses the default `9042`. So setting `self.port` to `None` when neither is provided is correct, as it lets the driver use its default. However, if I want to keep the explicit default of 9042 in Celery for some reason (though letting the driver handle it is better), I should be careful. Looking at the current code: `self.port = port or conf.get('cassandra_port', None)` If I change the default `port` to `None`, and it's not in `conf`, `self.port` will be `None`. If `self.port` is `None`, `Cluster(port=None, ...)` will use 9042. Let's check if there are any other places where `self.port` is used. It's used in `_get_connection`: ```python self._connection = Cluster( self.servers, port=self.port, ... ``` So yes, it's only used here. Wait, if I want to preserve the current "default to 9042 if nothing is provided" behavior while allowing config to override, I could do: `self.port = port or conf.get('cassandra_port') or 9042` But the simplest change is just changing the default value in `__init__` to `None`. If I change `port=9042` to `port=None` in `__init__`: 1. `CassandraBackend(app, port=123)` -> `self.port` = 123. 2. `CassandraBackend(app)` & `conf.cassandra_port=456` -> `self.port` = 456. 3. `CassandraBackend(app)` & `conf.cassandra_port` not set -> `self.port` = `None`. `Cluster(port=None)` -> uses 9042. This seems correct and minimal. Wait, if I want to be absolutely sure that the fail-safe is 9042 even if the driver changes its default (unlikely), I could do: `self.port = port or conf.get('cassandra_port', 9042)` But the proposed fix in the context was: "Change the default value of `port` in the `__init__` signature from `9042` to `None`." Let's see: `self.port = port or conf.get('cassandra_port', None)` If `port=None` (default) and `conf.get('cassandra_port', None)` is `None`, then `self.port` is `None`. Let's apply the fix. <channel|><|tool_call>call:edit_file{filepath:<|"|>celery/backends/cassandra.py<|"|>,new_string:<|"|> def __init__(self, app, port=None, **kwargs):<|"|>,old_string:<|"|> def __init__(self, app, port=9042, **kwargs):<|"|>}<tool_call|><|tool_response>
Generated tokens 59 tokens · stopped: STOP
Ah, the indentation. Let me read the file again to make sure I have the exact line.
Ah, the indentation. Let me read the file again to make sure I have the exact line. <channel|><|tool_call>call:read_file{filepath:<|"|>celery/backends/cassandra.py<|"|>,start_line:80,end_line:100}<tool_call|><|tool_response>
Generated tokens 197 tokens · stopped: STOP
I see, the `__init__` has more arguments than I thought.

```python
    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,
                 port=9042, bundle_path=None, **kwargs):
```

So I need to replace that.

I see, the `__init__` has more arguments than I thought. ```python def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None, port=9042, bundle_path=None, **kwargs): ``` So I need to replace that. <channel|><|tool_call>call:edit_file{filepath:<|"|>celery/backends/cassandra.py<|"|>,new_string:<|"|> def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None, port=None, bundle_path=None, **kwargs):<|"|>,old_string:<|"|> def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None, port=9042, bundle_path=None, **kwargs):<|"|>}<tool_call|><|tool_response>
Generated tokens 715 tokens · stopped: STOP
Now let's verify with the reproduction script.
Now let's verify with the reproduction script.<channel|><|tool_call>call:run_command{command:<|"|>python3 - <<'PY' import unittest from unittest.mock import MagicMock, patch # Mock the cassandra driver import sys mock_cassandra = MagicMock() sys.modules['cassandra'] = mock_cassandra sys.modules['cassandra.cluster'] = mock_cassandra.cluster sys.modules['cassandra.auth'] = mock_cassandra.auth sys.modules['cassandra.query'] = mock_cassandra.query from celery.backends.cassandra import CassandraBackend class TestCassandraBackendPort(unittest.TestCase): def test_port_config_is_used(self): app = MagicMock() app.conf.result_serializer = 'json' app.conf.result_cache_max = -1 app.conf.result_accept_content = None app.conf.accept_content = ['json'] app.conf.result_expires = None def mock_get(key, default=None): config = { 'cassandra_servers': ['localhost'], 'cassandra_keyspace': 'test', 'cassandra_table': 'test', 'cassandra_port': 61003, 'cassandra_options': {} } return config.get(key, default) app.conf.get = mock_get backend = CassandraBackend(app=app) with patch('cassandra.cluster.Cluster') as mock_cluster: mock_cluster.return_value.connect.return_value = MagicMock() backend._get_connection() args, kwargs = mock_cluster.call_args self.assertEqual(kwargs['port'], 61003) def test_default_port_still_works(self): app = MagicMock() app.conf.result_serializer = 'json' app.conf.result_cache_max = -1 app.conf.result_accept_content = None app.conf.accept_content = ['json'] app.conf.result_expires = None def mock_get(key, default=None): config = { 'cassandra_servers': ['localhost'], 'cassandra_keyspace': 'test', 'cassandra_table': 'test', # cassandra_port NOT set } return config.get(key, default) app.conf.get = mock_get backend = CassandraBackend(app=app) with patch('cassandra.cluster.Cluster') as mock_cluster: mock_cluster.return_value.connect.return_value = MagicMock() backend._get_connection() args, kwargs = mock_cluster.call_args # self.port will be None, Cluster(port=None) uses 9042 self.assertIsNone(kwargs['port']) if __name__ == '__main__': unittest.main() PY <|"|>}<tool_call|><|tool_response>
Generated tokens 243 tokens · stopped: STOP
The tests pass!
`test_port_config_is_used` now passes because `port` defaults to `None`, so `self.port = None or 61003`, which is `61003`.
`test_default_port_still_works` passes because `port` defaults to `None` and `conf` has no `cassandra_port`, so `self.port = None or None`, which is `None`. As discussed, `cassandra-driver`'s `Cluster` handles `port=None` by using 9042.

I should also check if there are any other classes that might have similar issues.
`celery/backends/cassandra.py` seems to be the only one that uses `cassandra`.
Let's check for other backends that might have this pattern of `default_val or conf.get('something', None)`.

I'll search for `.get('cassandra_` in the codebase to be sure.
The tests pass! `test_port_config_is_used` now passes because `port` defaults to `None`, so `self.port = None or 61003`, which is `61003`. `test_default_port_still_works` passes because `port` defaults to `None` and `conf` has no `cassandra_port`, so `self.port = None or None`, which is `None`. As discussed, `cassandra-driver`'s `Cluster` handles `port=None` by using 9042. I should also check if there are any other classes that might have similar issues. `celery/backends/cassandra.py` seems to be the only one that uses `cassandra`. Let's check for other backends that might have this pattern of `default_val or conf.get('something', None)`. I'll search for `.get('cassandra_` in the codebase to be sure.<channel|><|tool_call>call:run_command{command:<|"|>grep -rn --include="*.py" ".get('cassandra_" .<|"|>}<tool_call|><|tool_response>
Generated tokens 498 tokens · stopped: STOP
I see several other `conf.get('cassandra_...')` calls.
Let's check if any of them have a default value in the `__init__` that would cause the same issue.

```python
    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,
                 port=None, bundle_path=None, **kwargs):
```
The arguments are `servers`, `keyspace`, `table`, `entry_ttl`, `port`, `bundle_path`.
All of them are `None` by default (except `port` which I changed from `9042` to `None`).

Let's check if `entry_ttl` is used similarly:
```python
        expires = entry_ttl or conf.get('cassandra_entry_ttl', None)
```
Since `entry_ttl` defaults to `None`, this is fine.

What about `servers`, `keyspace`, `table`?
```python
        self.servers = servers or conf.get('cassandra_servers', None)
        self.keyspace = keyspace or conf.get('cassandra_keyspace', None)
        self.table = table or conf.get('cassandra_table', None)
```
Since they all default to `None`, they are also fine.

One more thing: `cassandra_options` is not an argument to `__init__`, it's just:
`self.cassandra_options = conf.get('cassandra_options', {})`
This is also fine.

Consistency check for `read_cons` and `write_cons`:
```python
        read_cons = conf.get('cassandra_read_consistency') or 'LOCAL_QUORUM'
        write_cons = conf.get('cassandra_write_consistency') or 'LOCAL_QUORUM'
```
These are not in `__init__`, they just use the config or a default. This is correct because they are not overrideable via `__init__` arguments.

It seems the only bug was indeed the `port=9042` default in `__init__`.

Final verify of the diff.
I see several other `conf.get('cassandra_...')` calls. Let's check if any of them have a default value in the `__init__` that would cause the same issue. ```python def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None, port=None, bundle_path=None, **kwargs): ``` The arguments are `servers`, `keyspace`, `table`, `entry_ttl`, `port`, `bundle_path`. All of them are `None` by default (except `port` which I changed from `9042` to `None`). Let's check if `entry_ttl` is used similarly: ```python expires = entry_ttl or conf.get('cassandra_entry_ttl', None) ``` Since `entry_ttl` defaults to `None`, this is fine. What about `servers`, `keyspace`, `table`? ```python self.servers = servers or conf.get('cassandra_servers', None) self.keyspace = keyspace or conf.get('cassandra_keyspace', None) self.table = table or conf.get('cassandra_table', None) ``` Since they all default to `None`, they are also fine. One more thing: `cassandra_options` is not an argument to `__init__`, it's just: `self.cassandra_options = conf.get('cassandra_options', {})` This is also fine. Consistency check for `read_cons` and `write_cons`: ```python read_cons = conf.get('cassandra_read_consistency') or 'LOCAL_QUORUM' write_cons = conf.get('cassandra_write_consistency') or 'LOCAL_QUORUM' ``` These are not in `__init__`, they just use the config or a default. This is correct because they are not overrideable via `__init__` arguments. It seems the only bug was indeed the `port=9042` default in `__init__`. Final verify of the diff. <channel|><|tool_call>call:run_command{command:<|"|>git status --short && git diff<|"|>}<tool_call|><|tool_response>
Generated tokens 263 tokens · stopped: STOP
The diff is minimal and clean. No other files were modified.

One last check: the problem description said "The `cassandra_port` configuration is ignored, causing the system to always attempt to connect to the default Cassandra port (9042)".
By changing the default `port` to `None`, I've ensured that `port or conf.get('cassandra_port', None)` will use `conf.get('cassandra_port', None)` if no `port` is passed to `__init__`.

If both `port` is `None` and `conf.get('cassandra_port', None)` is `None`, `self.port` becomes `None`.
Then `Cluster(port=self.port, ...)` is `Cluster(port=None, ...)`.
The `cassandra-driver` handles `port=None` by using its own default (9042).
So the behavior for "no config" remains "use 9042".
The behavior for "config provided" changes from "use 9042" to "use config".
The behavior for "explicit port passed to constructor" remains "use explicit port".

Everything is correct.
The diff is minimal and clean. No other files were modified. One last check: the problem description said "The `cassandra_port` configuration is ignored, causing the system to always attempt to connect to the default Cassandra port (9042)". By changing the default `port` to `None`, I've ensured that `port or conf.get('cassandra_port', None)` will use `conf.get('cassandra_port', None)` if no `port` is passed to `__init__`. If both `port` is `None` and `conf.get('cassandra_port', None)` is `None`, `self.port` becomes `None`. Then `Cluster(port=self.port, ...)` is `Cluster(port=None, ...)`. The `cassandra-driver` handles `port=None` by using its own default (9042). So the behavior for "no config" remains "use 9042". The behavior for "config provided" changes from "use 9042" to "use config". The behavior for "explicit port passed to constructor" remains "use explicit port". Everything is correct.<channel|><|tool_call>call:submit_patch{}<tool_call|><|tool_response>

Patch, tests and logs

Final code change Included
diff --git a/celery/backends/cassandra.py b/celery/backends/cassandra.py
index 0eb37f3..6724cfc 100644
--- a/celery/backends/cassandra.py
+++ b/celery/backends/cassandra.py
@@ -86,7 +86,7 @@ class CassandraBackend(BaseBackend):
     supports_autoexpire = True      # autoexpire supported via entry_ttl
 
     def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=None,
-                 port=9042, bundle_path=None, **kwargs):
+                 port=None, bundle_path=None, **kwargs):
         super().__init__(**kwargs)
 
         if not cassandra:
Test output Included
============================= test session starts ==============================
collected 12 items

t/unit/backends/test_cassandra.py ...........F                           [100%]

=================================== FAILURES ===================================
/celery/t/unit/backends/test_cassandra.py:273: assert None == 9042
==================================== PASSES ====================================
- generated xml file: /tmp/rebench-grade-ad6103b8df014daeb1fc451093201571.xml --
=========================== short test summary info ============================
PASSED t/unit/backends/test_cassandra.py::test_CassandraBackend::test_init_no_cassandra
PASSED t/unit/backends/test_cassandra.py::test_CassandraBackend::test_init_with_and_without_LOCAL_QUROM
PASSED t/unit/backends/test_cassandra.py::test_CassandraBackend::test_init_with_cloud
PASSED t/unit/backends/test_cassandra.py::test_CassandraBackend::test_reduce
PASSED t/unit/backends/test_cassandra.py::test_CassandraBackend::test_get_task_meta_for
PASSED t/unit/backends/test_cassandra.py::test_CassandraBackend::test_as_uri
PASSED t/unit/backends/test_cassandra.py::test_CassandraBackend::test_store_result
PASSED t/unit/backends/test_cassandra.py::test_CassandraBackend::test_timeouting_cluster
PASSED t/unit/backends/test_cassandra.py::test_CassandraBackend::test_create_result_table
PASSED t/unit/backends/test_cassandra.py::test_CassandraBackend::test_init_session
PASSED t/unit/backends/test_cassandra.py::test_CassandraBackend::test_auth_provider
FAILED t/unit/backends/test_cassandra.py::test_CassandraBackend::test_options
========================= 1 failed, 11 passed in 0.06s =========================
Test errors Included
Test report (JUnit) Included
<?xml version="1.0" encoding="utf-8"?><testsuites><testsuite name="pytest" errors="0" failures="1" skipped="0" tests="12" time="0.066" timestamp="2026-11-14T05:07:05.689461+00:00" hostname="465117d68ecc"><testcase classname="t.unit.backends.test_cassandra.test_CassandraBackend" name="test_init_no_cassandra" time="0.009" /><testcase classname="t.unit.backends.test_cassandra.test_CassandraBackend" name="test_init_with_and_without_LOCAL_QUROM" time="0.001" /><testcase classname="t.unit.backends.test_cassandra.test_CassandraBackend" name="test_init_with_cloud" time="0.014" /><testcase classname="t.unit.backends.test_cassandra.test_CassandraBackend" name="test_reduce" time="0.001" /><testcase classname="t.unit.backends.test_cassandra.test_CassandraBackend" name="test_get_task_meta_for" time="0.001" /><testcase classname="t.unit.backends.test_cassandra.test_CassandraBackend" name="test_as_uri" time="0.001" /><testcase classname="t.unit.backends.test_cassandra.test_CassandraBackend" name="test_store_result" time="0.001" /><testcase classname="t.unit.backends.test_cassandra.test_CassandraBackend" name="test_timeouting_cluster" time="0.001" /><testcase classname="t.unit.backends.test_cassandra.test_CassandraBackend" name="test_create_result_table" time="0.001" /><testcase classname="t.unit.backends.test_cassandra.test_CassandraBackend" name="test_init_session" time="0.001" /><testcase classname="t.unit.backends.test_cassandra.test_CassandraBackend" name="test_auth_provider" time="0.001" /><testcase classname="t.unit.backends.test_cassandra.test_CassandraBackend" name="test_options" time="0.001"><failure message="assert None == 9042&#10; +  where None = &lt;celery.backends.cassandra.CassandraBackend object at 0x7e877a659ea0&gt;.port">E   assert None == 9042
     +  where None = &lt;celery.backends.cassandra.CassandraBackend object at 0x7e877a659ea0&gt;.port</failure></testcase></testsuite></testsuites>
Agent log Included
  [   0.0s] 📋 System Prompt: You are a principal Python software engineer resolving a repository issue in `/workspace`.
  [   0.0s] 🎯 Task Prompt: You are evaluating a software engineering task for repository celery/celery.
  [  14.2s] 💭 (452 chars) "The user is reporting that the `cassandra_port` configuration is not being used when using 
the Cassandra result backend...."
  [  14.2s] 🔧 run_command grep -rn --include="*.py" "cassandra_port" .
  [  14.3s]   → ./celery/backends/cassandra.py:99:        self.port = port or conf.get('cassandra_port', None)
  [  18.6s] 💭 (127 chars) "Okay, the `cassandra_port` is mentioned in `celery/backends/cassandra.py` at line 99.
Let's read the file to see how it'..."
  [  18.6s] 📖 read_file (celery/backends/cassandra.py)
  [  18.7s]   ✓ {'status': 'ok', 'filepath': 'celery/backends/cassandra.py', 'content': '"""Apache Cassandra result 
store backend using …
  [  23.1s] 💭 (71 chars) "Let's read the `_get_connection` method and following part of the file."
  [  23.1s] 📖 read_file (celery/backends/cassandra.py)
  [  23.2s]   ✓ {'status': 'ok', 'filepath': 'celery/backends/cassandra.py', 'content': '        try:\n            if 
self._session is n…
  [ 164.4s] 💭 (4655 chars) "Wait, I see this in `__init__`:

```python
    def __init__(self, servers=None, keyspace=None, table=None, entry_ttl=Non..."
  [ 164.4s] 🔧 run_command (52 lines) python3 - <<'PY'
  [ 164.9s]   → error (exit 0): 
  [ 183.9s] 💭 (776 chars) "Ah, `BaseBackend.__init__` expects `conf` to be an object with attributes, not a dictionary.

```python
  File "/workspa..."
  [ 183.9s] 📖 read_file (celery/backends/base.py)
  [ 184.0s]   ✓ {'status': 'ok', 'filepath': 'celery/backends/base.py', 'content': '"""Result backend base classes.\n\n-
:class:`BaseBac…
  [ 190.9s] 💭 (193 chars) "Wait, `celery/backends/cassandra.py` inherits from `BaseBackend`.
But the `BaseBackend` class is not shown in the snippe..."
  [ 190.9s] 🔧 run_command grep -n "class BaseBackend" celery/backends/base.py
  [ 191.0s]   → 804:class BaseBackend(Backend, SyncBackendMixin):
  [ 229.0s] 💭 (371 chars) "And `AsyncBackendMixin`, `SyncBackendMixin` and others.
The `Backend.__init__` at line 116 is where it fails:
```python
..."
  [ 229.0s] 🔧 run_command (70 lines) python3 - <<'PY'
  [ 229.2s]   🔧 
  [ 253.5s] 💭 (444 chars) "I didn't put assertions in the second test yet. Let's run a version that just fails if the 
current behavior is present.
..."
  [ 253.5s] 🔧 run_command (46 lines) python3 - <<'PY'
  [ 253.7s]   → error (exit 0): 
  [ 286.2s] 💭 (694 chars) "I keeps missing required attributes for `BaseBackend`. I'll just use a `MagicMock` for 
`app.conf` and `app` and not worr..."
  [ 286.2s] 🔧 run_command (50 lines) python3 - <<'PY'
  [ 286.4s]   → error (exit 0): 
  [ 342.4s] 💭 (82 chars) "Kombu is complaining about `*` for `accept_content`. I'll change it to `['json']`."
  [ 342.4s] 🔧 run_command (46 lines) python3 - <<'PY'
  [ 342.5s]   → error (exit 0): 
  [ 378.9s] 💭 (2828 chars) "Perfect! Bug reproduced. `9042 != 61003` means the `cassandra_port` in configuration was 
ignored.

Now I will apply the ..."
  [ 378.9s] ✏️ edit_file (celery/backends/cassandra.py)
  [ 378.9s]   ❌ {'status': 'error', 'error_type': 'FileEditError', 'error_message': "Failed to replace: old_string not 
found. Ensure you…
  [ 380.6s] 💭 (83 chars) "Ah, the indentation. Let me read the file again to make sure I have the exact line."
  [ 380.6s] 📖 read_file (celery/backends/cassandra.py)
  [ 380.6s]   ✓ {'status': 'ok', 'filepath': 'celery/backends/cassandra.py', 'content': "\n    #: List of Cassandra 
servers with format:…
  [ 384.6s] 💭 (236 chars) "I see, the `__init__` has more arguments than I thought.

```python
    def __init__(self, servers=None, keyspace=None, ..."
  [ 384.6s] ✏️ edit_file (celery/backends/cassandra.py)
  [ 384.7s]   ✓ {'status': 'ok', 'filepath': 'celery/backends/cassandra.py', 'occurrences': 1, 'strategy': 'exact', 
'diff': '--- a/celer…
  [ 396.0s] 💭 (46 chars) "Now let's verify with the reproduction script."
  [ 396.0s] 🔧 run_command (74 lines) python3 - <<'PY'
  [ 396.1s]   🔧 
  [ 403.4s] 💭 (711 chars) "The tests pass!
`test_port_config_is_used` now passes because `port` defaults to `None`, so `self.port = None or 61003`,..."
  [ 403.4s] 🔧 run_command grep -rn --include="*.py" ".get('cassandra_" .
  [ 403.5s]   → ./celery/backends/cassandra.py:96:        self.servers = servers or conf.get('cassandra_servers', None)
  [ 415.5s] 💭 (1610 chars) "I see several other `conf.get('cassandra_...')` calls.
Let's check if any of them have a default value in the `__init__`..."
  [ 415.5s] 🔧 run_command git status --short && git diff
  [ 415.6s]   →  M celery/backends/cassandra.py
  [ 423.0s] 💭 (908 chars) "The diff is minimal and clean. No other files were modified.

One last check: the problem description said "The `cassand..."
  [ 423.0s] 🤖 submit_patch
  [ 423.1s]   → submit_patch: {"status": "ok", "patch_size": 566, "files_changed": 1}
  [ 428.1s] 💭 (156 chars) "I have successfully reproduced the bug, implemented the fix, and verified it with a 
reproduction script. The fix is mini..."
  [ 428.1s] ✅ Agent finished: The `CassandraBackend` was ignoring the `cassandra_port` configuration because the `port`
argument in its `__init__` method had a default value of `9042`. Since `9042` is truthy, the expression `self....
Native result row
{
  "agent_error": null,
  "duration_seconds": 462.66,
  "error": "Test failures/errors recorded in JUnit XML (failures=1, errors=0)",
  "grade": {
    "collected_tests": 12,
    "competition_junit_ok": false,
    "error": "Test failures/errors recorded in JUnit XML (failures=1, errors=0)",
    "required_issues_count": 1,
    "resolved": false,
    "status_counts": {
      "FAILED": 1,
      "PASSED": 11
    },
    "strict_clean_patch": true,
    "test_exit_code": 1
  },
  "instance_id": "celery__celery-9465",
  "pass_idx": 0,
  "patch_chars": 566,
  "phase1_seconds": 460.99,
  "repo": "celery/celery",
  "request_log_path": "/kaggle-root/working/r31/rollouts_X/requests/celery__celery-9465__p0__r2.jsonl",
  "resolved": false,
  "rollout_idx": 2,
  "run_key": "celery__celery-9465__p0__r2",
  "strict_clean_patch": true,
  "tool_calls": 16,
  "total_llm_calls": 18,
  "trace_path": "/kaggle-root/working/r31/rollouts_X/traces/trace_celery__celery-9465__p0__r2.json"
}