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https://issues.apache.org/jira/browse/HDDS-13919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chu Cheng Li updated HDDS-13919:
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Status: Patch Available (was: In Progress)
> S3 Conditional Writes (PutObject)
> ---------------------------------
>
> Key: HDDS-13919
> URL: https://issues.apache.org/jira/browse/HDDS-13919
> Project: Apache Ozone
> Issue Type: Sub-task
> Components: Ozone Manager, s3gateway
> Reporter: Chu Cheng Li
> Assignee: Chu Cheng Li
> Priority: Major
> Labels: pull-request-available
>
> h4. Headers
> h5. If-Match: <etag> - Succeeds only if the object EXISTS and its ETag matches
> - Returns `412 Precondition Failed` if object doesn't exist or ETag doesn't
> match
> - Primary use case: Atomic updates (similar to compare-and-swap)
> - Enables optimistic locking patterns
> h5. If-None-Match: "*" - Succeeds only if the object does NOT exist
> - Returns `412 Precondition Failed` if object already exists
> - Primary use case: Prevent accidental overwrites (create-only semantics)
> h4. Behavior Notes
> - Both headers can be used independently for different use cases
> - If-Match enables atomic rewrites (update existing object only if unchanged)
> - If-None-Match enables atomic creates (create only if doesn't exist)
> - Cannot use both If-Match and If-None-Match together in the same request
> h4. Error Codes
> h5. 412 Precondition Failed - When condition is not met
> - No additional charges for failed conditional requests
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