Fix leaked semaphore warnings in Airflow 3 by resetting dbt adapters#2335
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tatiana
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This looks very good, @pankajkoti !
I just merged the memory debug PR, #2327, please - feel free to rebase and cut an alpha, so the change can be validated with the user who reported it.
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Pull request overview
Adds a post-dbt-run cleanup to prevent Airflow 3 “leaked semaphore objects” warnings by resetting dbt adapters and forcing garbage collection.
Changes:
- Introduces
_cleanup_dbt_adapters()to reset dbt adapters and rungc.collect(). - Calls
_cleanup_dbt_adapters()after eachdbtRunner.invoke(...). - Adds unit tests covering adapter cleanup behavior and ensuring cleanup is triggered after
run_command.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.
| File | Description |
|---|---|
cosmos/dbt/runner.py |
Adds adapter reset + GC cleanup and wires it into run_command. |
tests/dbt/test_runner.py |
Adds tests for cleanup behavior and run_command invoking cleanup. |
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Looks good, @pankajkoti , thanks for working on this!
I gave some minor feedback inline. My main concern is the usage of Exception.
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…2335) dbt adapters maintain an internal state that holds onto semaphores. When running with Airflow 3, this causes "leaked semaphore objects" warnings from Python's resource tracker at task shutdown. This fix resets dbt adapters and triggers garbage collection after each dbt command execution to properly release these resources. Closes: #2334 (cherry picked from commit 2128e94)
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**Enhancements** * Change Snowflake profile mappings to default to four threads by @tatiana in #2374 * Refactor to avoid potential future ``UnboundLocalError`` for ``producer_task`` in ``calculate_tasks_map`` by @rin in #2309 **Bug Fixes** * Fix graph selector when using + selector with ``dbt-loom`` by @award1230 in #2389 * Populate ``compiled_sql`` for ``InvocationMode.SUBPROCESS`` in ``ExecutionMode.WATCHER`` by @pankajkoti in #2319 * Preserve ``extra_context`` for watcher consumer task instances by @pankajkoti in #2381 * Fix watcher: respect ``deferrable=False`` from ``operator_args`` on consumer sensor by @pankajkoti in #2384 * Error handle invalid YAML with ``LoadMode.DBT_MANIFEST`` and ``RenderConfig.selector`` by @jonbillings in #2316 * Fix selecting model when it has the same name as folder by @pankajastro in #2328 * Handle Param Validation errors by @tatiana in #2358 * Fix cache swap issue by @jonbillings in #2332 * Fix leaked semaphore warnings in Airflow 3 by resetting dbt adapters by @pankajkoti in #2335 **Docs** * Document ``ExecutionMode.KUBERNETES`` limitations by @tatiana in #2326 **Others** * Add .airflow-registry.yaml for Airflow Provider Registry by @kaxil in #2387 * Improve test coverage for PR #2307 by @tatiana in #2308 * Address feedback from code review #2389 by @evanvolgas in #2394 Closes: astronomer/oss-integrations-private#333
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Enhancements * Change Snowflake profile mappings to default to four threads by @tatiana in #2374 * Refactor to avoid potential future ``UnboundLocalError`` for ``producer_task`` in ``calculate_tasks_map`` by @rin in #2309 Bug Fixes * Fix graph selector when using + selector with ``dbt-loom`` by @award1230 in #2389 * Populate ``compiled_sql`` for ``InvocationMode.SUBPROCESS`` in ``ExecutionMode.WATCHER`` by @pankajkoti in #2319 * Preserve ``extra_context`` for watcher consumer task instances by @pankajkoti in #2381 * Fix watcher: respect ``deferrable=False`` from ``operator_args`` on consumer sensor by @pankajkoti in #2384 * Error handle invalid YAML with ``LoadMode.DBT_MANIFEST`` and ``RenderConfig.selector`` by @YourRoyalLinus in #2316 * Fix selecting model when it has the same name as folder by @pankajastro in #2328 * Handle Param Validation errors by @tatiana in #2358 * Fix cache swap issue by @YourRoyalLinus in #2332 * Fix leaked semaphore warnings in Airflow 3 by resetting dbt adapters by @pankajkoti in #2335 Docs * Document ``ExecutionMode.KUBERNETES`` limitations by @tatiana in #2326 Others * Add .airflow-registry.yaml for Airflow Provider Registry by @kaxil in #2387 * Improve test coverage for PR #2307 by @tatiana in #2308 * Address feedback from code review #2389 by @evanvolgas in #2394 Additional details on this change: - The actual release was done from branch 1.13: https://github.com/astronomer/astronomer-cosmos/releases/tag/astronomer-cosmos-v1.13.1 - This PR aims to update our CHANGELOG, and allow us to give credit to the username that was being questioned by codespell
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1.14.0 (2026-04-07) --------------------- Breaking Changes * Drop support for Airflow versions earlier than **2.9** by @jedcunningham in #2288 * Fix inclusion of package models and selection/exclusion behavior by @pankajkoti in #2357 * ``ExecutionMode.WATCHER``: The per-node ``*_status`` XCom value is now a dict (``{"status": "<status>", "outlet_uris": [...]}``) instead of a plain string. Any custom code that reads these internal XCom keys directly will need to be updated by @pankajkoti in #2507 Features * Add cluster policy support for ``ExecutionMode.WATCHER`` sensor retries by @astro-anand in #2293 * Add debug mode to track memory utilization by @tatiana in #2327 * Add FQN selection support for ``LoadMode.DBT_MANIFEST`` by @pankajastro in #2375 * Introduce interceptors for Cosmos tasks by @tatiana in #2419 * Add config to allow disabling dag versioning by @pankajkoti in #2470 * Implement TaskGroups by models folder by @maximilianoarcieri and @tatiana in #1566, #2469, and #2420 * feat: implement DbtTestWatcherOperator by @michal-mrazek in #2447 * Add source freshness aware execution for ``ExecutionMode.WATCHER`` by @pankajastro and @tatiana in #2467 * Note: Like ``ExecutionMode.WATCHER``, this feature is experimental and its interface and implementation can change in the future. * Add Airflow 3.2 support by @pankajastro and @pankajkoti in #2472 Enhancements * Add watcher mode support for dbt test node states by @michal-mrazek in #2318 * Rename watcher-mode sensor retry queue and reuse it for producer tasks by @pankajastro in #2331 * Fix leaked semaphore warnings in Airflow 3 by resetting dbt adapters by @pankajkoti in #2335 * Improve dbt Fusion support and related tests by @tatiana in #2356 * Default Snowflake profile mappings to four threads by @tatiana in #2374 * Attempt to remove Pydantic as a dependency by @tatiana in #2377 * Log dbt-core and adapter versions in watcher consumer tasks by @pankajastro in #2412 * Log model errors in watcher consumer on dbt node failure by @pankajastro in #2431 * Reduce XCom read/write for tracking node state and errors in ConsumerWatcher task by @pankajastro in #2471 * Remove duplicate debug log in watcher subprocess path by @tatiana in #2494 * Simplify and unify WATCHER implementation regardless of InvocationMode by @tatiana in #2498 * Switch to lazy imports in cosmos/__init__.py by @pankajkoti in #2531 Bug Fixes * Handle invalid YAML errors with ``LoadMode.DBT_MANIFEST`` and ``RenderConfig.selector`` by @YourRoyalLinus in #2316 * Populate ``compiled_sql`` for ``InvocationMode.SUBPROCESS`` in ``ExecutionMode.WATCHER`` by @pankajkoti in #2319 * Fix select/exclude type mismatch by @tatiana in #2364 * Set ``emit_datasets=False`` for ``DbtTest*`` operators by @pankajastro in #2365 * Set correct queue priority for watcher producer tasks by @pankajastro in #2372 * Preserve ``extra_context`` for watcher consumer task instances by @pankajkoti in #2381 * Respect ``deferrable=False`` from ``operator_args`` on watcher consumer sensors by @pankajkoti in #2384 * Fix watcher queue precedence and add documentation by @pankajastro in #2391 * Do not set ``compiled_sql`` on ``ExecutionMode.WATCHER`` producers by @pankajkoti in #2440 * Remove const attribute for ``__cosmos_telemetry_metadata__`` dag param by @pankajkoti in #2466 * Remove timeout override from Cosmos watcher sensors by @tatiana and @claude in #2478 * Remove forced ``retries=0`` from watcher producer operators by @tatiana in #2479 * RFC: Add patch for newer versions of amazon provider when running dbt on EKS by @aoelvp94 in #2481 * Fix ``cosmos_debug_max_memory_mb`` XCom not pushed in Watcher sensor tasks by @tatiana in #2503 * Fix ``TestBehavior.NONE`` and ``TestBehavior.AFTER_ALL`` exclude ignored with selectors in ``ExecutionMode.WATCHER`` by @pankajkoti in #2511 * Move dataset emission for ``ExecutionMode.WATCHER`` from producer to consumer sensors by @pankajkoti in #2507 Docs * Document cluster policy configuration for ``ExecutionMode.WATCHER`` sensor tasks by @pankajastro in #2315 * Remove outdated docs for the dbt docs plugin with Airflow 3 by @pankajastro in #2353 * Make Watcher DBT Execution Queue heading clickable by @pankajastro in #2354 * Update ``ExecutionMode.WATCHER`` documentation regarding test node implementation by @jroachgolf84 in #2355 * Fix ``pre_dbt_fusion`` configuration rendering by @pankajastro in #2369 * Add documentation for including/excluding nodes based on FQN by @pankajastro in #2371 * Update watcher execution mode documentation by @tatiana in #2380 * Add documentation for ``DbtSeedLocalOperator`` by @jroachgolf84 in #2383 * Fix miscellaneous Sphinx warnings by @pankajastro in #2395 * Improve contributing documentation by @lzdanski in #2397 * Add **Get Started in 5 Minutes** guide by @lzdanski in #2398 * Add Sphinx redirects package for documentation redirects by @lzdanski in #2407 * Restructure **Getting Started** and **Guides** sections by @lzdanski in #2418 * Add open-source quickstart by @lzdanski in #2439 * Fix documentation redirects by @lzdanski in #2442 * Restructure and refactor reference documentation by @lzdanski in #2443 * Add execution modes decision documentation by @lzdanski in #2444 * Add **Core Concepts** page to Getting Started by @lzdanski in #2448 * Add guide: *How Cosmos Works* by @lzdanski in #2449 * Update **Getting Started** overview and index pages by @lzdanski in #2452 * Add guide: *How Cosmos Runs dbt* by @lzdanski in #2453 * Fix miscellaneous documentation links by @lzdanski in #2454 * Add Mermaid diagrams and execution mode diagrams by @lzdanski and @tatiana in #2459 * Add documentation for memory optimization options by @pankajastro in #2340 * Fix typo in watcher execution mode docs by @evanvolgas in #2485 * Fix minor documentation issues by @evanvolgas in #2489 * Add troubleshooting note for dbt debug logs in ExecutionMode.WATCHER by @tatiana in #2491 * docs: unify RST header styles across documentation by @jigangz in #2473 * docs: fix env var for rich logging by @vricciardulli in #2514 * docs: update dbt project path example for Airflow 3 Astro compatibility by @yeoreums in #2512 * Document missing Cosmos Airflow config settings in cosmos-conf.rst by @tatiana in #2515 * Split security-privacy policy doc and add dependency cooldown by @pankajkoti in #2519 * Add performance optimization and troubleshooting docs by @pankajkoti in #2521 * Update copyright year to 2026 by @tayloramurphy in #2527 * docs: Updating "Project Policies" to "Policies" in menu bar by @jroachgolf84 in #2526 Others * Fix tests after removing support for Airflow versions earlier than 2.9 by @tatiana in #2321 * Enable listener tests for Airflow 3.1 by @pankajastro in #2348 * Accept ``int`` or ``float`` for ``cosmos_debug_max_memory_mb`` in integration tests by @pankajkoti in #2352 * Update ``CODEOWNERS`` to prioritize ``oss-integrations`` by @tatiana in #2359 * Fix automatic reviewer assignment in GitHub by @tatiana and @phanikumv in #2360 * Improve PyPI tagging by @tatiana in #2363 * Add integration tests for dbt Fusion and ``ExecutionMode.WATCHER`` by @tatiana in #2373 * Fix Zizmor check by @tatiana in #2376 * Remove ``methodtools`` dependency by @tatiana in #2378 * Improve comments on #2389 by @evanvolgas in #2394 * Refactor ``load_from_dbt_manifest`` to reduce code complexity by @pankajkoti in #2399 * Refactor ``_handle_no_precursors_or_descendants`` to reduce complexity by @pankajkoti in #2400 * Improve issue templates by @tatiana in #2401 * Avoid running tests when only docs change by @tatiana in #2402 * Add ``no-reload`` target for serving docs locally by @pankajkoti in #2405 * Fix test hash checks on macOS by @tatiana in #2406 * Attempt deterministic dbt project copy in test fixtures by @pankajkoti in #2409 * Pin ``virtualenv <21`` due to hatch incompatibility in CI by @pankajkoti in #2410 * Revert virtualenv pin for hatch installation in CI by @pankajkoti in #2426 * Add version comments for commit SHA pinned GitHub Actions by @pankajkoti in #2436 * Fix ``hatch run docs:build`` issues by @tatiana in #2437 * Minor code improvements by @dnskr in #2446 * Pre-commit autoupdate by @pre-commit-ci in #2367, #2396, #2422, #2451, #2468, #2495, and #2516 * Add file to support Claude understanding the Cosmos repository by @tatiana in #2458 * Dependency updates by @dependabot in #2368, #2425, #2435, #2465, #2475, #2504, #2518, and #2528 * Isolate Scarf telemetry integration test into its own CI job by @pankajkoti and @claude in #2477 * ci: upgrade Airflow version to 3.1 in MyPy type-check job by @yeoreums in #2506 * Add commit message guidelines to CLAUDE.md by @pankajkoti in #2509 * Extend skipping tests in CI for more non-code file changes by @pankajkoti in #2510 * Add Dependabot pre-commit support with 7-day cooldown by @pankajkoti in #2517 * Enforce zero warnings policy for documentation by @dnskr in #2513 Co-authored-by: Pankaj Koti <pankajkoti699@gmail.com> Co-authored-by: Tatiana Al-Chueyr <tatiana.alchueyr@gmail.com> --------- Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com> Co-authored-by: Pankaj Koti <pankajkoti699@gmail.com> Co-authored-by: Tatiana Al-Chueyr <tatiana.alchueyr@gmail.com>
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dbt adapters maintain an internal state that holds onto semaphores.
When running with Airflow 3, this causes "leaked semaphore objects"
warnings from Python's resource tracker at task shutdown.
This fix resets dbt adapters and triggers garbage collection after
each dbt command execution to properly release these resources.
Closes: #2334