Rich Howarth created HBASE-18847:
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Summary: Huge performance bottleneck in HFileWriterV2 in 1.2.6
Key: HBASE-18847
URL: https://issues.apache.org/jira/browse/HBASE-18847
Project: HBase
Issue Type: Bug
Affects Versions: 1.2.6
Reporter: Rich Howarth
The below code block starts at line 277 of HFileWriterV2.java. Class-level
synchronization in a heavily used code path has a demonstrably significant
negative effect on performance. I tested forcing a major compaction with 18
compaction threads per node; removing the synchronization resulted in an order
of magnitude performance increase, with the bottleneck then being at the disks
(where I want it to be).
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