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https://issues.apache.org/jira/browse/HDFS-4532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13590656#comment-13590656
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Kihwal Lee commented on HDFS-4532:
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The patch itself looks good, but there is one thing I am not sure about in the
existing code.
Do isExternalInvocation() and FSNamesystem.getRemoteIp() work correctly when
Hftp is used?
> 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: 0.23.0, 2.0.0-alpha, 3.0.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Attachments: HDFS-4532.branch-23.patch, HDFS-4532.patch
>
>
> 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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