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Posted to hdfs-dev@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2013/02/26 21:20:12 UTC

[jira] [Created] (HDFS-4532) RPC call queue may fill due to current user lookup

Daryn Sharp created HDFS-4532:
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             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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