leventov commented on a change in pull request #7938: locking in Theta sketch 
buffer aggregator
URL: https://github.com/apache/incubator-druid/pull/7938#discussion_r317993101
 
 

 ##########
 File path: 
extensions-core/datasketches/src/main/java/org/apache/druid/query/aggregation/datasketches/theta/SketchBufferAggregator.java
 ##########
 @@ -40,6 +44,7 @@
   private final int maxIntermediateSize;
   private final IdentityHashMap<ByteBuffer, Int2ObjectMap<Union>> unions = new 
IdentityHashMap<>();
 
 Review comment:
   Please also add all the necessary `@GuardedBy("stripedLock")` annotations to 
fields and methods in other Aggregator classes changed in this PR.

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