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From "Mikhail Bautin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10089) Metrics intern table names cause eventual permgen OOM in 0.94
Date Sat, 07 Dec 2013 02:03:36 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13842008#comment-13842008
] 

Mikhail Bautin commented on HBASE-10089:
----------------------------------------

[~xieliang007]: yes, you are right. In that case, this problem is specific to JDK 6 with low
permgen size.

> Metrics intern table names cause eventual permgen OOM in 0.94
> -------------------------------------------------------------
>
>                 Key: HBASE-10089
>                 URL: https://issues.apache.org/jira/browse/HBASE-10089
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.0, 0.94.14
>            Reporter: Dave Latham
>            Assignee: Ted Yu
>            Priority: Minor
>             Fix For: 0.94.15
>
>         Attachments: 10089-0.94.txt
>
>
> As part of the metrics system introduced in HBASE-4768 there are two places that hbase
uses String interning ( SchemaConfigured and SchemaMetrics ).  This includes interning table
names.  We have long running environment where we run regular integration tests on our application
using hbase.  Those tests create and drop tables with new names regularly.  These leads to
filling up the permgen with interned table names.  Workaround is to periodically restart the
region servers.



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