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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