Review Request 34283: Third Attempt: use a global read-write lock in purgatory

[Guozhang Wang]

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Review request for kafka.


Bugs: KAFKA-2160
    https://issues.apache.org/jira/browse/KAFKA-2160


Repository: kafka


Description
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Fix KAFKA-2160


Diffs
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  core/src/main/scala/kafka/server/DelayedOperation.scala 
2ed9b467c2865e5717d7f6fd933cd09a5c5b22c0 

Diff: https://reviews.apache.org/r/34283/diff/


Testing
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Thanks,

Guozhang Wang