gustavodemorais opened a new pull request, #28933:
URL: https://github.com/apache/flink/pull/28933

   ## What is the purpose of the change
   
   WatermarkCompactingSinkMaterializer removed buffer entries while iterating 
and read their values afterwards. The value of a Map.Entry is undefined once 
the entry has been removed, and RocksDBMapEntry returns null for it, so 
consolidation on restore only works because the heap backend keeps removed 
values readable.
   
   ## Brief change log
   
   - Consume all buffered values in consolidateBufferToMinValue before mutating 
the buffer, and drop it with a single clear()
   - Iterate values() instead of entries() in the ordered branch
   
   ## Verifying this change
   
   - WatermarkCompactingSinkMaterializerTest
   
   ## Does this pull request potentially affect one of the following parts:
   
   - Dependencies (does it add or upgrade a dependency): no
   - The public API, i.e., is any changed class annotated with 
`@Public(Evolving)`: no
   - The serializers: no
   - The runtime per-record code paths (performance sensitive): no - 
consolidation runs at most once per key per restore
   - Anything that affects deployment or recovery: JobManager (and its 
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
   - The S3 file system connector: no
   
   ## Documentation
   
   - Does this pull request introduce a new feature? no
   - If yes, how is the feature documented? not applicable
   
   ---
   
   ##### Was generative AI tooling used to co-author this PR?
   
   - [x] Yes (please specify the tool below)
   
   2.1.220 (Claude Code) with Opus 5


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