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Fix flaky FileIOTest.testMatchWatchForNewFiles test under CI filesystems#38047

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Fix flaky FileIOTest.testMatchWatchForNewFiles test under CI filesystems#38047
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@bvolpato bvolpato commented Apr 2, 2026

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addresses #19480

The FileIOTest.testMatchWatchForNewFiles test occasionally flakes in the CI environment because the updOptions configuration in CopyFilesFn does not preserve file attributes when overwriting existing files. In some CI filesystems, this causes the copied file to register a lastModifiedMillis timestamp of 0. Thus, when ExtractFilenameAndLastUpdateFn parses this file, it throws a RuntimeException at FileIO.java:800, failing the pipeline run.

This PR adds StandardCopyOption.COPY_ATTRIBUTES to preserve the file's original timestamps, avoiding the exception.


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Summary of Changes

Hello, I'm Gemini Code Assist1! 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 addresses a flaky test in FileIOTest by ensuring that file attributes are correctly maintained when files are replaced. By preserving original timestamps and increasing the wait time for file operations, the test becomes more resilient to the timing and filesystem constraints often encountered in CI environments.

Highlights

  • File Attribute Preservation: Updated the file copy options to include StandardCopyOption.COPY_ATTRIBUTES, ensuring file timestamps are preserved during overwrites to prevent failures in CI environments.
  • Test Stability: Increased the Thread.sleep duration from 100ms to 500ms in the test logic to provide more headroom for high-load CI filesystems.

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@github-actions github-actions Bot added the java label Apr 2, 2026
@bvolpato
bvolpato marked this pull request as draft April 2, 2026 14:49
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bvolpato force-pushed the bvolpato/fix-fileio-flaky-test branch 3 times, most recently from 4350fb8 to 5e86d7e Compare April 6, 2026 02:20
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bvolpato marked this pull request as ready for review May 5, 2026 09:36
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bvolpato commented May 5, 2026

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[review-prs-verification]
Ready to merge: yes

Verified after pushing 9aa0988403676b9b5e34d1502c4741ce5373ca7b:

  • ./gradlew --no-daemon :runners:direct-java:needsRunnerTests --tests org.apache.beam.sdk.io.FileIOTest.testMatchWatchForNewFiles
  • ./gradlew --no-daemon :sdks:java:core:spotlessCheck :sdks:java:core:compileTestJava :sdks:java:core:assemble
  • ./gradlew --no-daemon :runners:java-fn-execution:test --tests org.apache.beam.runners.fnexecution.logging.GrpcLoggingServiceTest.testMultipleClientsFailingIsHandledGracefullyByServer
  • GitHub checks on PR head: 18 success, 0 pending, 0 failing.

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Code Review

This pull request modifies FileIOTest.java to include COPY_ATTRIBUTES in file update options and introduces manual modification time updates using future timestamps to ensure distinct mtimes during test execution. Feedback suggests adopting a more deterministic method for timestamp generation to avoid fragility and recommends capturing the system time once when updating multiple files to ensure consistency.

Comment thread sdks/java/core/src/test/java/org/apache/beam/sdk/io/FileIOTest.java Outdated
Comment thread sdks/java/core/src/test/java/org/apache/beam/sdk/io/FileIOTest.java Outdated
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Assigning reviewers:

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Reminder, please take a look at this pr: @kennknowles

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Assigning new set of reviewers because Pr has gone too long without review. If you would like to opt out of this review, comment assign to next reviewer:

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bvolpato marked this pull request as draft May 22, 2026 12:06
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Reminder, please take a look at this pr: @chamikaramj

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Reminder, please take a look at this pr: @kennknowles

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Assigning new set of reviewers because Pr has gone too long without review. If you would like to opt out of this review, comment assign to next reviewer:

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Reminder, please take a look at this pr: @ahmedabu98

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Assigning new set of reviewers because Pr has gone too long without review. If you would like to opt out of this review, comment assign to next reviewer:

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Hey @bvolpato! Is this good to go?

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Reminder, please take a look at this pr: @Abacn

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waiting on author

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bvolpato marked this pull request as ready for review July 14, 2026 12:02
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Hey @bvolpato! Is this good to go?

@ahmedabu98 yoyo! yes, sorry -- I just marked as review to fix CI checks and forgot to put it back in review

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Code Review

This pull request updates FileIOTest.java to ensure overwrite updates get distinct modification times when COPY_ATTRIBUTES is enabled by explicitly setting the last modified time on source files. The review feedback suggests capturing System.currentTimeMillis() in a local variable and reusing it to ensure both files receive the exact same timestamp, avoiding potential discrepancies if the system clock ticks over between calls.

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Comment thread sdks/java/core/src/test/java/org/apache/beam/sdk/io/FileIOTest.java Outdated
bvolpato added 2 commits July 16, 2026 00:25
addresses apache#19480

The `FileIOTest.testMatchWatchForNewFiles` test occasionally flakes in the CI environment because the `updOptions` configuration in `CopyFilesFn` does not preserve file attributes when overwriting existing files. In some CI filesystems, this causes the copied file to register a `lastModifiedMillis` timestamp of `0`. Thus, when `ExtractFilenameAndLastUpdateFn` parses this file, it throws a `RuntimeException` at `FileIO.java:800`, failing the pipeline run.

This PR adds `StandardCopyOption.COPY_ATTRIBUTES` to preserve the file's original timestamps, avoiding the exception.
@bvolpato
bvolpato force-pushed the bvolpato/fix-fileio-flaky-test branch from 9aa0988 to 2d8a2bb Compare July 16, 2026 04:32
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