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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5898) Consider double-checked locking for block cache lock
Date Sun, 29 Apr 2012 03:15:11 GMT
Todd Lipcon created HBASE-5898:
----------------------------------

             Summary: Consider double-checked locking for block cache lock
                 Key: HBASE-5898
                 URL: https://issues.apache.org/jira/browse/HBASE-5898
             Project: HBase
          Issue Type: Improvement
          Components: performance
    Affects Versions: 0.94.1
            Reporter: Todd Lipcon


Running a workload with a high query rate against a dataset that fits in cache, I saw a lot
of CPU being used in IdLock.getLockEntry, being called by HFileReaderV2.readBlock. Even though
it was all cache hits, it was wasting a lot of CPU doing lock management here. I wrote a quick
patch to switch to a double-checked locking and it improved throughput substantially for this
workload.

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