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Posted to issues@iceberg.apache.org by "williamacostalora (via GitHub)" <gi...@apache.org> on 2026/07/20 03:30:38 UTC
[PR] Fix issue 2530 [iceberg-python]
williamacostalora opened a new pull request, #3688:
URL: https://github.com/apache/iceberg-python/pull/3688
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Closes #2530
# Rationale for this change
Python 3.13 introduced stricter resource leak detection that flags unclosed
sqlite3 connections left open by SQLAlchemy connection pools after test teardown.
PR #2863 added warning filters in `pyproject.toml` to suppress these warnings
rather than fixing the root cause. This PR resolves the underlying issue by
adding `catalog.close()` / `engine.dispose()` calls to all affected test fixtures
and removes the sqlite `ResourceWarning` filter.
Nine locations across `tests/catalog/test_sql.py` and `tests/conftest.py` created
`SqlCatalog` instances without calling `catalog.close()` during teardown. The
`close()` method (which calls `self.engine.dispose()`) already existed and was
correctly implemented in `pyiceberg/catalog/sql.py` — it simply wasn't being
invoked by the fixtures.
**Note:** The two ray-related warning filters (`unclosed file`, `subprocess still
running`) are left in place as ray is an optional dependency requiring a CI
environment to reproduce and verify. Happy to address those in a follow-up PR.
## Are these changes tested?
Yes. Removed the sqlite `ResourceWarning` filter from `pyproject.toml` and ran:
uv run python -m pytest tests/catalog/test_sql.py -W error::ResourceWarning -v
13/13 tests pass with zero ResourceWarnings. Also added
`test_catalog_fixture_closes_connections` to `TestSqlCatalogClose` as a
regression test to prevent future regressions.
## Are there any user-facing changes?
No — all changes are in test files and `pyproject.toml`. No public API changes.
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Re: [PR] Add Python 3.13 support [iceberg-python]
Posted by "Fokko (via GitHub)" <gi...@apache.org>.
Fokko commented on code in PR #3688:
URL: https://github.com/apache/iceberg-python/pull/3688#discussion_r3894832355
##########
pyiceberg/catalog/bigquery_metastore.py:
##########
@@ -102,6 +102,16 @@ def __init__(self, name: str, **properties: str):
self.location = location
self.project_id = project_id
+ @override
Review Comment:
I think this is a great addition
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Re: [PR] Add Python 3.13 support [iceberg-python]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #3688:
URL: https://github.com/apache/iceberg-python/pull/3688#issuecomment-5922339885
This pull request has been marked as stale due to 30 days of inactivity. It will be closed in 1 week if no further activity occurs. If you think that's incorrect or this pull request requires a review, please simply write any comment. If closed, you can revive the PR at any time and @mention a reviewer or discuss it on the dev@iceberg.apache.org list. Thank you for your contributions.
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Re: [PR] Fix issue 2530 [iceberg-python]
Posted by "williamacostalora (via GitHub)" <gi...@apache.org>.
williamacostalora commented on PR #3688:
URL: https://github.com/apache/iceberg-python/pull/3688#issuecomment-5086855701
Hi @Fokko @kevinjqliu — this PR fixes the underlying sqlite connection leaks in test fixtures that were being suppressed by warning filters added in PR #2863. All 17 CI checks now pass. The fix covers unclosed SQLAlchemy connections across `tests/catalog/test_sql.py`, `tests/catalog/test_bigquery_metastore.py`, `tests/table/test_pyarrow.py`, `tests/table/test_inspect.py`, `tests/table/test_datafusion.py`, and `tests/conftest.py`. Would appreciate a review when you have bandwidth!
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Re: [PR] Add Python 3.13 support [iceberg-python]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #3688:
URL: https://github.com/apache/iceberg-python/pull/3688#issuecomment-6071819107
This pull request has been closed due to lack of activity. This is not a judgement on the merit of the PR in any way. It is just a way of keeping the PR queue manageable. If you think that is incorrect, or the pull request requires review, you can revive the PR at any time.
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Re: [PR] Fix issue 2530 [iceberg-python]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #3688:
URL: https://github.com/apache/iceberg-python/pull/3688#issuecomment-5433237522
This pull request has been marked as stale due to 30 days of inactivity. It will be closed in 1 week if no further activity occurs. If you think that's incorrect or this pull request requires a review, please simply write any comment. If closed, you can revive the PR at any time and @mention a reviewer or discuss it on the dev@iceberg.apache.org list. Thank you for your contributions.
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Re: [PR] Fix issue 2530 [iceberg-python]
Posted by "rambleraptor (via GitHub)" <gi...@apache.org>.
rambleraptor commented on code in PR #3688:
URL: https://github.com/apache/iceberg-python/pull/3688#discussion_r3660596886
##########
vendor/hive_metastore/ThriftHiveMetastore.py:
##########
@@ -12201,9 +12201,9 @@ def __init__(self, handler):
self._processMap["truncate_table_req"] = Processor.process_truncate_table_req
self._processMap["get_tables"] = Processor.process_get_tables
self._processMap["get_tables_by_type"] = Processor.process_get_tables_by_type
- self._processMap[
- "get_all_materialized_view_objects_for_rewriting"
- ] = Processor.process_get_all_materialized_view_objects_for_rewriting
+ self._processMap["get_all_materialized_view_objects_for_rewriting"] = (
Review Comment:
Another formatting change. We really shouldn't change vendor code if we can avoid it.
##########
pyiceberg/catalog/sql.py:
##########
@@ -778,9 +778,25 @@ def close(self) -> None:
"""Close the catalog and release database connections.
This method closes the SQLAlchemy engine and disposes of all connection pools.
- This ensures that any cached connections are properly closed, which is especially
- important for blobfuse scenarios where file handles need to be closed for
- data to be flushed to persistent storage.
+ This is crucial for proper resource cleanup and must be called in test fixture
+ teardowns to prevent Python 3.13+ ResourceWarnings about unclosed connections.
+
+ The connection pool lifecycle is managed by SQLAlchemy's engine. When dispose()
Review Comment:
Can you simplify this comment? This is really verbose and it's hard to understand what the additional text is adding.
##########
pyproject.toml:
##########
@@ -171,9 +173,10 @@ filterwarnings = [
"error",
# Ignore Python version deprecation warning from google.api_core while we still support 3.10
"ignore:You are using a Python version.*which Google will stop supporting:FutureWarning:google.api_core",
- # Python 3.13 sqlite3 module ResourceWarnings for unclosed database connections
- "ignore:unclosed database in <sqlite3.Connection object*:ResourceWarning",
- # Ignore Ray subprocess cleanup warnings
+ # Ray subprocess cleanup warnings are suppressed because ray is not installed in local test environments
Review Comment:
This comment doesn't seem to be doing anything? The old comment was better.
##########
pyiceberg/catalog/sql.py:
##########
@@ -778,9 +778,25 @@ def close(self) -> None:
"""Close the catalog and release database connections.
This method closes the SQLAlchemy engine and disposes of all connection pools.
- This ensures that any cached connections are properly closed, which is especially
- important for blobfuse scenarios where file handles need to be closed for
- data to be flushed to persistent storage.
+ This is crucial for proper resource cleanup and must be called in test fixture
+ teardowns to prevent Python 3.13+ ResourceWarnings about unclosed connections.
+
+ The connection pool lifecycle is managed by SQLAlchemy's engine. When dispose()
+ is called, it closes all idle connections and invalidates active ones. This is
+ especially important in test environments where fixtures create catalogs that
+ otherwise may not be explicitly closed, and in production scenarios with
+ blobfuse where file handles need to be closed for data to be flushed to
+ persistent storage.
+
+ For Python 3.14+, explicit garbage collection is needed to ensure all
+ sqlite3 connections are immediately released, as deferred GC can cause
+ ResourceWarnings during test teardown.
+
+ See: Issue #2530 (https://github.com/apache/iceberg-python/issues/2530)
"""
if hasattr(self, "engine"):
self.engine.dispose()
+ # Force immediate garbage collection to release sqlite3 connections on Python 3.14+
+ import gc
+
+ gc.collect()
Review Comment:
This scares me. Why do we need to force garbage collection to release these connections? This will have unintended side-effects elsewhere. If not, it'll just be really slow.
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Re: [PR] Add Python 3.13 support [iceberg-python]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] closed pull request #3688: Add Python 3.13 support
URL: https://github.com/apache/iceberg-python/pull/3688
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