Investigate Locking & Contention in the Write Path
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Key: HBASE-1213
URL: https://issues.apache.org/jira/browse/HBASE-1213
Project: Hadoop HBase
Issue Type: Improvement
Affects Versions: 0.19.0
Reporter: Ben Maurer
Fix For: 0.20.0
When doing a large number of bulk updates from different clients, I noticed
that there was a high level of lock contention for stuff like locking the HLog.
It seems that each thread acquires the lock for a single BatchUpdate, releases
the lock then another thread owns the lock before the initial writer gets to
the next update. Having the threads bounce around may lead to suboptimal
performance.
Should be benchmarked & maybe changed to have less context switching.
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