feat(storage): Takeover idempotence.#13230
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Summary of ChangesHello @cjc25, 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 introduces a crucial enhancement to the storage system's idempotency handling. By correctly identifying 'takeover' operations with specified object generations as idempotent, the system can now safely retry these operations without causing unintended side effects. This improves the overall reliability and fault tolerance of storage interactions, particularly for append-based operations. Highlights
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Code Review
This pull request makes 'takeover' operations on a specific object generation idempotent, allowing them to be safely retried. The change correctly identifies this new condition for idempotency. My review includes a suggestion to consider unifying this new precondition logic with the existing w.o.conds mechanism to improve code clarity and maintainability.
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| isIdempotent := w.o.conds != nil && (w.o.conds.GenerationMatch >= 0 || w.o.conds.DoesNotExist) | ||
| // Specified generation takeovers are also idempotent | ||
| isIdempotent = isIdempotent || w.Append && w.o.gen > 0 |
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The condition w.Append && w.o.gen > 0 seems to implement a form of precondition for what the commit message calls a 'takeover' of a specific generation. This is conceptually similar to what w.o.conds.GenerationMatch provides. To keep the handling of preconditions centralized and improve maintainability, have you considered expressing this 'takeover' condition through the existing w.o.conds struct? For instance, if w.Append and w.o.gen > 0 are true, perhaps w.o.conds.GenerationMatch could be set accordingly earlier in the writer's setup. This would avoid having two separate mechanisms for specifying generation-based preconditions.
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This comment is incorrect :)
Takeovers at a specific object generation are safe to retry.
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| isIdempotent := w.o.conds != nil && (w.o.conds.GenerationMatch >= 0 || w.o.conds.DoesNotExist) | ||
| // Specified generation takeovers are also idempotent | ||
| isIdempotent = isIdempotent || w.Append && w.o.gen > 0 |
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This comment is incorrect :)
🤖 I have created a release *beep* *boop* --- ## [1.57.1](storage/v1.57.0...storage/v1.57.1) (2025-10-28) ### Bug Fixes * **storage:** Takeover idempotence. ([#13230](#13230)) ([cc5d2a1](cc5d2a1)) * **storage:** Copy metadata when using Copier with grpc ([#12919](#12919)) ([57a2e80](57a2e80)) * **storage:** Fix takeover response handling. ([#13239](#13239)) ([26d75bc](26d75bc)) * **storage:** Remove default timeout for gRPC operations ([#13022](#13022)) ([b94c3ba](b94c3ba)) * **storage:** Skip download of file outside of target dir ([#12945](#12945)) ([6259aee](6259aee)) * **storage:** Upgrade gRPC service registration func ([8fffca2](8fffca2)) --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). --------- Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com> Co-authored-by: Brenna N Epp <[email protected]>
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Takeovers at a specific object generation are safe to retry.