guozhangwang opened a new pull request #11367:
URL: https://github.com/apache/kafka/pull/11367


   Note this is a bit hacky solution to improve the performance of 
stream-stream join for in-memory shared stores: theoretically deleting while 
iterating is not a good pattern and hence have undefined behavior. After 
looking through the source code I think the only reason it works here is 
because we only delete keys that we have iterated over.
   
   ### Committer Checklist (excluded from commit message)
   - [ ] Verify design and implementation 
   - [ ] Verify test coverage and CI build status
   - [ ] Verify documentation (including upgrade notes)
   


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