Chu Cheng Li created HDDS-13963:
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Summary: Implement Atomic Create-If-Not-Exists via Generation
Sentinel
Key: HDDS-13963
URL: https://issues.apache.org/jira/browse/HDDS-13963
Project: Apache Ozone
Issue Type: Sub-task
Components: OM
Reporter: Chu Cheng Li
Assignee: Chu Cheng Li
Extends the `expectedDataGeneration` logic in Ozone Manager to support atomic
"create-if-not-exists" semantics.
* Enables passing `-1` as the `expectedDataGeneration`.
* When set to `-1`, the `validateAtomicRewrite` logic (in both Create and
Commit phases) strictly enforces that the target key must **not** exist,
throwing `KEY_ALREADY_EXISTS` otherwise.
* This establishes the core OM support required for conditional
"If-None-Match" requests, allowing upper layers (like S3 Gateway) to implement
these features with minimal changes to the underlying protocol.
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