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Posted to commits@airflow.apache.org by "FrankYang0529 (via GitHub)" <gi...@apache.org> on 2026/08/27 09:03:09 UTC
[PR] Fix scheduler crash when the Kafka event producer plugin is enabled [airflow]
FrankYang0529 opened a new pull request, #72138:
URL: https://github.com/apache/airflow/pull/72138
## Why
- With `[kafka_event_producer] dag_run_events_enabled = True`, the scheduler crashes with `sqlalchemy.orm.exc.DetachedInstanceError` when more than one Dag run is queued.
- The DagRun listeners run inside the scheduler's own transaction. It moves queued Dag runs to RUNNING.
- Building the Kafka producer resolves the Kafka connection. On the scheduler that means `MetastoreBackend.get_connection`, which is decorated with `@provide_session`. `create_session()` is thread-scoped, so on the scheduler's thread it reuses the scheduler's own session and closes it on exit.
- The first Dag run in `_start_queued_dagruns` passes. the second crashes on `dag_run.dag_id`.
## How
- Producer construction moves into `_build_producer`, which runs on a single-use `ThreadPoolExecutor`. `settings.Session` gives out one session per thread, so the connection lookup gets a session of its own and leaves the caller's transaction alone.
## Verification
- `uv run --project providers/apache/kafka pytest providers/apache/kafka/tests/unit`
- `breeze shell --integration kafka --backend postgres --db-reset`, then `pytest providers/apache/kafka/tests/integration/apache/kafka/plugins/test_event_producer.py --integration kafka`.
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Re: [PR] Fix scheduler crash when the Kafka event producer plugin is enabled [airflow]
Posted by "potiuk (via GitHub)" <gi...@apache.org>.
potiuk commented on PR #72138:
URL: https://github.com/apache/airflow/pull/72138#issuecomment-5839124176
Hello @FrankYang0529 - thank you for your contributions to Apache Airflow!
The Airflow community has introduced a limit of **5 open pull requests at a time** for contributors without write access to the repository. You currently have 30 open pull requests, so - as a one-time step of introducing the limit - we closed the ones where maintainers have not engaged yet:
* #69698 - Avoid deactivating configured Dag bundles on transient get bundle errors
* #71678 - Add gzip compression option for GCS remote task logs
* #71775 - Fix comma-separated selected_fields in BigQuery to SQL transfers
* #71837 - Fix the API server silently ignoring its gunicorn worker hooks
* #72027 - Fix docs omitting asset from the Dag discovery safe-mode heuristic
* #72104 - Add missing Druid Ingest connection type
* #72138 - Fix scheduler crash when the Kafka event producer plugin is enabled
* #72153 - Fix unscheduled tasks left on a stale Dag version
* #72317 - Make AzureBatchOperator batch_max_retries take effect
* #72593 - Fix airflow.utils.context deprecation shim returning a module object
* #72626 - Support team-scoped secrets in LocalFilesystemBackend
* #72802 - Honour dag_ignore_file_syntax in Task SDK and example plugin loading
* #72858 - Restore CLI commands from custom executors and auth managers
* #72884 - Restore helpful error for unregistered priority weight strategies
* #72919 - Fix flaky test_trigger_log in triggerer job tests
* #72920 - Fix API server failing to start when [api] access_logfile is set
* #73020 - Fix missing task display name and map index in API audit logs
* #73029 - Fail Gemini batch job operators when the job does not succeed
* #73031 - Fix extra Dag versions from template field callables if paths change
* #73032 - Fix Dags staying blocked by max_active_runs until the next parse
* #73081 - Reject async callables in @task.virtualenv and @task.external_python
* #73136 - Fix env var names in airflow config list for dotted and team sections
* #73247 - Fix OpenLineage jobDependencies run ID after upstream task is cleared
* #73312 - Fix SFTPSensor skipping python_callable in deferrable mode
These pull requests stay open because maintainers are already engaged in them - they count towards your limit:
* #68625 - Add KafkaSharedStreamProducer and KafkaSharedStreamTrigger
* #68778 - Add rerun policy for rollups when an upstream partition is re-run
* #70351 - Replace AirflowException with ValueError in ProduceToTopicOperator
* #71869 - Catch stale entries in the Java SDK dependency trust list
* #72057 - Support priority_weight in EdgeExecutor
* #73021 - Speed up the event logs API by loading only display names
This is **not** a judgement of you or of your changes. We never told contributors before that opening many pull requests at once was a problem, so there is nothing to feel bad about - and nothing is lost: your branches, commits and the review history stay where they are.
What we ask you to do is to make your **first prioritization decision**: choose which of the pull requests above matter most to you, and reopen them (up to 5 open at a time, including the ones still open) with the "Reopen pull request" button or `gh pr reopen <PR_NUMBER> --repo apache/airflow`. Reopen the ones you are ready to follow through - keep them rebased, respond to review comments and fix failing checks.
While your pull requests are waiting for review, the most valuable thing you can do is help in other ways - reviewing other contributors' pull requests, helping with issues, and taking part in the discussions on the devlist and Slack.
Why we introduced the limit, what it means for you and how to reopen or restore a pull request is explained in https://github.com/apache/airflow/blob/main/contributing-docs/32_open_pull_request_limit.rst.
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Drafted-by: Claude Code (Opus 5); reviewed by @potiuk before posting
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Re: [PR] Fix scheduler crash when the Kafka event producer plugin is enabled [airflow]
Posted by "potiuk (via GitHub)" <gi...@apache.org>.
potiuk closed pull request #72138: Fix scheduler crash when the Kafka event producer plugin is enabled
URL: https://github.com/apache/airflow/pull/72138
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