Bharath Vissapragada created HBASE-25998: --------------------------------------------
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). -- This message was sent by Atlassian Jira (v8.3.4#803005)