[GitHub] [kafka] dima5rr commented on pull request #9020: KAFKA-10271 Performance degradation while fetching a key from a single partition

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dima5rr commented on pull request #9020:
URL: https://github.com/apache/kafka/pull/9020#issuecomment-658604900


   Hi @vvcephei, thank you for the input.
   
   After profiling under load it looks like problem in excessive loops over 
calling internalTopologyBuilder.topicGroups()
   which is synchronized.
   Though short-circuit WrappingStoreProvider can help, but will not solve root 
cause.
   
   WDYT?
   
   
https://github.com/apache/kafka/blob/f699bd98c14e31f07c5a3f6ba9ce2c4b441e7fdb/streams/src/main/java/org/apache/kafka/streams/state/internals/StreamThreadStateStoreProvider.java#L113
   
   
https://github.com/apache/kafka/blob/f699bd98c14e31f07c5a3f6ba9ce2c4b441e7fdb/streams/src/main/java/org/apache/kafka/streams/processor/internals/InternalTopologyBuilder.java#L1030
   
   
![9020](https://user-images.githubusercontent.com/18258318/87517410-79870d80-c687-11ea-8ba1-746af4c932fe.png)
   
   


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