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Posted to github@beam.apache.org by "damccorm (via GitHub)" <gi...@apache.org> on 2026/01/16 15:36:11 UTC
[PR] Fix spanner io hang by closing connections [beam]
damccorm opened a new pull request, #37327:
URL: https://github.com/apache/beam/pull/37327
Somehow spanner IO expansion is still hanging after https://github.com/apache/beam/pull/37305 in https://github.com/GoogleCloudPlatform/DataflowTemplates/pull/3222 (fully context https://github.com/GoogleCloudPlatform/DataflowTemplates/pull/3204). This tries to fix the problem differently by properly disposing of connections.
Notably, this doesn't address similar uses in https://github.com/apache/beam/blob/133034612813f20d76e0c081d5058f04daf10544/sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/spanner/changestreams/dao/DaoFactory.java#L119 - this is ok for now since these are only used by DoFns at runtime (not expansion), so they shouldn't cause the same hangs we were observing in pipeline expansion. But they should eventually be fixed.
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Re: [PR] Fix spanner io hang by closing connections [beam]
Posted by "gemini-code-assist[bot] (via GitHub)" <gi...@apache.org>.
gemini-code-assist[bot] commented on PR #37327:
URL: https://github.com/apache/beam/pull/37327#issuecomment-3760628085
## Summary of Changes
Hello @damccorm, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request resolves a critical Spanner IO hang that occurred during pipeline expansion. The fix ensures that Spanner database connections are properly closed after use, preventing resource leaks and improving the stability of pipeline setup processes. This change specifically targets the `getDialect` method within `SpannerIO` to prevent the observed hangs.
### Highlights
* **Resource Management**: Introduced a `try-with-resources` statement for `SpannerAccessor` in the `getDialect` method to ensure proper and automatic closing of Spanner connections.
* **Bug Fix**: Addressed a persistent Spanner IO hang issue observed during pipeline expansion by ensuring that database connections are explicitly disposed of.
* **Scope Limitation**: Acknowledged that similar resource management patterns in `DaoFactory.java` are not addressed in this pull request, as they are not implicated in the pipeline expansion hangs this PR aims to fix.
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Re: [PR] Fix spanner io hang by closing connections [beam]
Posted by "github-actions[bot] (via GitHub)" <gi...@apache.org>.
github-actions[bot] commented on PR #37327:
URL: https://github.com/apache/beam/pull/37327#issuecomment-3760633897
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Re: [PR] Fix spanner io hang by closing connections [beam]
Posted by "damccorm (via GitHub)" <gi...@apache.org>.
damccorm merged PR #37327:
URL: https://github.com/apache/beam/pull/37327
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Re: [PR] Fix spanner io hang by closing connections [beam]
Posted by "damccorm (via GitHub)" <gi...@apache.org>.
damccorm commented on PR #37327:
URL: https://github.com/apache/beam/pull/37327#issuecomment-3760627820
R: @Abacn
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