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From "Larry McCay (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-10357) Memory Leak in UserGroupInformation.doAs for JDBC Connection to Hive
Date Fri, 21 Feb 2014 15:57:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-10357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13908453#comment-13908453

Larry McCay commented on HADOOP-10357:

This has been verified with loginUserFromKeytabAndReturnUGI as well as with a patch for getUGIFromSubject
from HADOOP-10342.
Using VisualVM we can identify UgiInstrumentation as a source of some of this leak - we end
up with an instance for every connection established and subsequently closed.

> Memory Leak in UserGroupInformation.doAs for JDBC Connection to Hive
> --------------------------------------------------------------------
>                 Key: HADOOP-10357
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10357
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: security
>    Affects Versions: 1.2.0
>            Reporter: Larry McCay
> When using UGI.doAs in order to make a connection there appears to be a memory leak involving
the UGI that is used for the doAs and the UGI held by TUGIAssumingTransport.
> When using this approach to establishing a JDBC connection in an environment that will
serve many users and requests client side eventually runs out of memory.

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