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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5239) Allow FSNamesystem lock fairness to be configurable
Date Fri, 20 Sep 2013 14:27:52 GMT
Daryn Sharp created HDFS-5239:
---------------------------------

             Summary: Allow FSNamesystem lock fairness to be configurable
                 Key: HDFS-5239
                 URL: https://issues.apache.org/jira/browse/HDFS-5239
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: namenode
    Affects Versions: 2.0.0-alpha, 3.0.0
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp


The fairness of the {{FSNamesystem#fsLock}} is hardcoded to {{true}}.  Using an unfair lock
provides a negligible increase to throughput.  However this is due to bottlenecks elsewhere
in the system. In combination with other changes, such as RPC layer and audit logging, preliminary
tests show up to a 5X improvement for a read heavy workload.

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