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From "Jonathan Eagles (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9749) Remove synchronization for UGI.getCurrentUser
Date Thu, 10 Apr 2014 20:50:19 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13965829#comment-13965829
] 

Jonathan Eagles commented on HADOOP-9749:
-----------------------------------------

Re-targeting to 2.5.0 as 0.23.x line is reaching maintenance mode. 

> 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
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Critical
>
> 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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