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https://issues.apache.org/jira/browse/HDFS-4532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13593380#comment-13593380
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Hudson commented on HDFS-4532:
------------------------------
Integrated in Hadoop-Hdfs-trunk #1335 (See
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1335/])
HDFS-4532. RPC call queue may fill due to current user lookup (daryn)
(Revision 1452435)
Result = SUCCESS
daryn : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1452435
Files :
* /hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
*
/hadoop/common/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
> 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
> Fix For: 3.0.0, 0.23.7, 2.0.4-beta
>
> 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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