gianm commented on a change in pull request #7203: Fix race in historical when 
loading segments in parallel
URL: https://github.com/apache/incubator-druid/pull/7203#discussion_r263497471
 
 

 ##########
 File path: server/src/main/java/org/apache/druid/server/SegmentManager.java
 ##########
 @@ -223,6 +233,8 @@ public void dropSegment(final DataSegment segment)
             final PartitionChunk<ReferenceCountingSegment> removed = 
loadedIntervals.remove(
                 segment.getInterval(),
                 segment.getVersion(),
+                // remove() internally searches for a partitionChunk to remove 
which is *equal* to the given
+                // partitionChunk. Note that partitionChunk.equals() checks 
only the partitionNum, but not the object.
 
 Review comment:
   Thanks for adding this comment. It was a bit confusing without it.

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