[Backport Fix to branch-3.1.x]: Prevent Hadoop directory copy failures by correctly setting generation id Preconditions #1463
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dheerajsngh
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Aug 25, 2025
- Origin PR/
…ration ID preconditions (#1363)
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Summary of Changes
Hello @dheerajsngh, 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 backports a critical fix to prevent Hadoop directory copy failures. The core issue stemmed from incorrect handling of Google Cloud Storage object generation IDs, specifically when a generation ID of 0 was being treated as a valid generation match precondition, leading to unexpected behavior. The changes ensure that generation ID preconditions are only applied when the generation ID is a positive value, aligning with how GCS handles object versions. Additionally, a minor tracing improvement was made to better track upload IDs.
Highlights
- Generation ID Handling: Modified GCS read channels to correctly apply generation ID preconditions only when the generation ID is a positive value, preventing issues with zero or null generation IDs.
- Tracing Improvement: Updated the GoogleCloudStorageClientGrpcTracingInterceptor to use a specific constant for uninitialized streamUploadId instead of null, improving clarity and robustness in tracing.
- Comprehensive Testing: Added new unit tests to explicitly verify that generation match preconditions are correctly applied (or not applied) based on the generation ID's value (positive vs. zero).
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Code Review
This pull request backports a fix to prevent Hadoop directory copy failures by ensuring that an invalid generation ID (specifically 0) is not used as a precondition in GCS requests. The changes correctly add a check for a positive generation ID before using it in generationMatch preconditions in both GoogleCloudStorageClientReadChannel and GoogleCloudStorageReadChannel. The logic is sound and the accompanying tests effectively verify the new behavior for both positive and zero generation IDs. The changes in GoogleCloudStorageClientGrpcTracingInterceptor to use a constant instead of null for streamUploadId are also a good improvement for robustness. Overall, the changes are correct and well-implemented.
Codecov Report❌ Patch coverage is Additional details and impacted files@@ Coverage Diff @@
## branch-3.1.x #1463 +/- ##
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Coverage ? 82.72%
Complexity ? 2238
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Files ? 119
Lines ? 9864
Branches ? 1201
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Hits ? 8160
Misses ? 1207
Partials ? 497
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