sanastas commented on issue #5698: Oak: New Concurrent Key-Value Map 
URL: 
https://github.com/apache/incubator-druid/issues/5698#issuecomment-499476854
 
 
   While measuring the Oak performance we have found IncrementalIndex module 
doesn't scale well with multi-threading. We traced the threads’ blocking states 
to two causes:
   
       A monitor in IncrementalIndex that synchronized access to dimensionDescs
       A Read-Write lock in StringDimensionIndexer
   
   The first case is addressed in PR#7838. You are welcome to take a look. 
Thanks!

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