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Posted to issues@hbase.apache.org by "Bharath Vissapragada (Jira)" <ji...@apache.org> on 2021/06/11 15:52:00 UTC

[jira] [Created] (HBASE-25998) Revisit synchronization in SyncFuture

Bharath Vissapragada created HBASE-25998:
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             Summary: Revisit synchronization in SyncFuture
                 Key: HBASE-25998
                 URL: https://issues.apache.org/jira/browse/HBASE-25998
             Project: HBase
          Issue Type: Improvement
          Components: Performance, regionserver, wal
    Affects Versions: 3.0.0-alpha-1, 1.7.0, 2.5.0
            Reporter: Bharath Vissapragada
            Assignee: Bharath Vissapragada


While working on HBASE-25984, I noticed some weird frames in the flame graphs around monitor entry exit consuming a lot of CPU cycles (see attached images). Noticed that the synchronization there is too coarse grained and sometimes unnecessary. I did a simple patch that switched to a reentrant lock based synchronization with condition variable rather than a busy wait and that showed 70-80% increased throughput in WAL PE. Seems too good to be true.. (more details in the comments).



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