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https://issues.apache.org/jira/browse/HDDS-15067?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bolin Lin updated HDDS-15067:
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Status: Patch Available (was: In Progress)
> Conditional CompleteMultipartUpload
> -----------------------------------
>
> Key: HDDS-15067
> URL: https://issues.apache.org/jira/browse/HDDS-15067
> Project: Apache Ozone
> Issue Type: Sub-task
> Components: OM, s3gateway
> Reporter: Chu Cheng Li
> Assignee: Bolin Lin
> Priority: Major
> Labels: pull-request-available
> Attachments: image-2026-04-21-15-25-36-673.png
>
>
> Conditional MPU completion should reuse the same conditional write fields
> already present in {{{}KeyArgs{}}}, but unlike normal conditional
> {{{}PUT{}}}, it does not need an open-key plus later commit bridge. The final
> key is assembled and committed inside one OM transaction in
> {{S3MultipartUploadCompleteRequest.validateAndUpdateCache(...)}} while
> holding the normal bucket write lock
> h3. Gateway Flow
> # Parse {{If-None-Match}} / {{If-Match}} using the same shared helper used
> by conditional {{{}PUT{}}}.
> # Extend the existing {{completeMultipartUpload}} client API, or add a
> conditional overload, so the gateway can pass the parsed condition to OM
> through {{{}OmKeyArgs{}}}.
> # Populate the request as follows:
> ** {{If-None-Match: *}} -> {{expectedDataGeneration =
> OzoneConsts.EXPECTED_GEN_CREATE_IF_NOT_EXISTS}}
> ** {{If-Match: "<etag>"}} -> {{expectedETag = <etag>}}
> # Ensure the OM protocol translator copies these optional fields from
> {{OmKeyArgs}} into the {{CompleteMultiPartUploadRequest}} {{{}KeyArgs{}}}.
> # Map conditional validation failures to the same S3 {{PreconditionFailed}}
> response used by the other conditional write paths.
>
> h3. OM Validation
> Validation should occur in
> {{S3MultipartUploadCompleteRequest.validateAndUpdateCache(...)}} after the
> request acquires the bucket write lock and before it assembles the final key
> from the uploaded parts.
> The proposed flow is:
> # Load the current committed destination key from {{{}keyTable{}}}.
> # Reuse the same {{If-Match}} validation helper already used by conditional
> {{PUT}} to convert {{expectedETag}} into {{{}expectedDataGeneration{}}}.
> # Reuse the same atomic rewrite validation helper to evaluate:
> ** create-if-absent semantics for {{If-None-Match: *}}
> ** generation/ETag match semantics for {{If-Match}}
> # If validation passes, continue with the existing MPU complete logic:
> validate part order, validate part identity, compute the MPU ETag, write the
> final key, and delete the multipart metadata/open-key state.
> # Clear conditional-only fields before persisting the committed key so they
> remain request-scoped metadata rather than part of the final key state.
>
> Because the final destination validation and the key-table write happen under
> the same OM bucket lock in one request, this path does not need a separate
> second-phase commit revalidation step like conditional {{{}PutObject{}}}.
>
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