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List:       hadoop-dev
Subject:    [jira] [Resolved] (HADOOP-9749) Remove synchronization for UGI.getCurrentUser
From:       "Daryn Sharp (JIRA)" <jira () apache ! org>
Date:       2017-03-27 17:53:47
Message-ID: JIRA.12658575.1374169640000.134106.1490637227507 () Atlassian ! JIRA
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     [ https://issues.apache.org/jira/browse/HADOOP-9749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel \
]

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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