fxbing commented on issue #4895: 
PulsarBrokerStatsClientTest.testTopicInternalStats is flaky
URL: https://github.com/apache/pulsar/issues/4895#issuecomment-524789900
 
 
   Fixed in #5040
   
   `individualDeletedMessages` is an instance of 
`ConcurrentOpenLongPairRangeSet` in `ManagedCursorImpl`.
   In `CursorStats`,  the value of `totalNonContiguousDeletedMessagesRange`  is 
`individualDeletedMessages.size()`, and the value of 
`individuallyDeletedMessages` is `individualDeletedMessages.toString()`.
   But in `ConcurrentOpenLongPairRangeSet`, `size()` and `toString()` use the 
same cache flag.
   After using one of `size()` and `toString()`, another can't get the correct 
result.

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