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From "Kihwal Lee (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-9749) Remove synchronization for UGI.getCurrentUser
Date Wed, 15 Feb 2017 15:17:42 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-9749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kihwal Lee updated HADOOP-9749:
-------------------------------
    Attachment: HADOOP-9749.trunk.patch

Resubmitting the trunk patch to trigger precommit.

> 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.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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