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https://issues.apache.org/jira/browse/HADOOP-9749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daryn Sharp resolved HADOOP-9749.
---------------------------------
Resolution: Duplicate
> Remove synchronization for UGI.getCurrentUser
> ---------------------------------------------
>
> Key: HADOOP-9749
> URL: https://issues.apache.org/jira/browse/HADOOP-9749
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: security
> Affects Versions: 0.23.0, 2.0.0-alpha, 3.0.0-alpha1
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Priority: Critical
> Attachments: HADOOP-9749.branch-2.patch, HADOOP-9749.trunk.2.patch,
> HADOOP-9749.trunk.patch, HADOOP-9749.trunk.patch
>
>
> HADOOP-7854 added synchronization to {{getCurrentUser}} due to
> {{ConcurrentModificationExceptions}}. This degrades NN call handler
> performance.
> The problem was not well understood at the time, but it's caused by a
> collision between relogin and {{getCurrentUser}} due to a bug in
> {{Krb5LoginModule}}. Avoiding the collision will allow removal of the
> synchronization.
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