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From "Michael Stack (Jira)" <j...@apache.org>
Subject [jira] [Created] (HBASE-24167) [Flakey Tests] TestHRegionWithInMemoryFlush#testWritesWhileScanning gets stuck MVCC
Date Sat, 11 Apr 2020 01:13:00 GMT
Michael Stack created HBASE-24167:
-------------------------------------

             Summary: [Flakey Tests] TestHRegionWithInMemoryFlush#testWritesWhileScanning
gets stuck MVCC
                 Key: HBASE-24167
                 URL: https://issues.apache.org/jira/browse/HBASE-24167
             Project: HBase
          Issue Type: Bug
            Reporter: Michael Stack


I see this in recent nightly fails on branch-2, my experimental branch. It happened in the
two builds last night. It was only test to fail. Both failed with:

 2020-04-10 07:42:46,700 WARN  [Time-limited test] regionserver.MultiVersionConcurrencyControl(228):
STUCK: MultiVersionConcurrencyControl{readPoint=8684,              writePoint=8686}

I ran the test in my  harness and it pushes up against heap limits for sure, especially after
recent cut down in forked jvm size.

For now, see if alleviating scope of testWritesWhileScanning just when called from this test
helps w/ flakeyness. Probably worth a deep dive why we get into this state w/ in-memory compaction.



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