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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4532) RPC call queue may fill due to current user lookup
Date Tue, 26 Feb 2013 20:20:12 GMT
Daryn Sharp created HDFS-4532:

             Summary: RPC call queue may fill due to current user lookup
                 Key: HDFS-4532
                 URL: https://issues.apache.org/jira/browse/HDFS-4532
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode
    Affects Versions: 2.0.0-alpha, 0.23.0, 3.0.0
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp
            Priority: Critical

Audit logging need to invoke {{UGI.getCurrentUser}} to log the user performing an operation.
 This is a synch'ed method, so audit logging is effectively serializing the completion of
concurrent read ops.  Under very heavy load, RPC throughput drops dramatically, the call queue
fills with thousands of waiting operations, and clients begin timing out.  Jstack shows all
but one call handler blocked on {{UGI.getCurrentUser}}.

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