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From "Ben Maurer (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1213) Investigate Locking & Contention in the Write Path
Date Tue, 24 Feb 2009 05:24:01 GMT
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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