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https://issues.apache.org/jira/browse/HDFS-4532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13592292#comment-13592292
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Kihwal Lee commented on HDFS-4532:
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+1 for the latest patch.
bq. Good questions, and a cursory scan of the code appears that hftp is not
handled correctly. The servlets attempt to get the rpc proxy from the servlet
context, and if it does it directly invokes methods on the server-side proxy.
This patch doesn't aggravate that issue.
Please file a jira for this.
> 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,
> 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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