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Date: Thu, 6 Dec 2012 05:02:58 +0000 (UTC)
From: "Ted Yu (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <1803075074.67001.1354770178237.JavaMail.jiratomcat@arcas>
In-Reply-To: <1259445436.14891.1353541378105.JavaMail.jiratomcat@arcas>
Subject: [jira] [Commented] (HBASE-7205) Coprocessor classloader is
 replicated for all regions in the HRegionServer
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    [ https://issues.apache.org/jira/browse/HBASE-7205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13511114#comment-13511114 ] 

Ted Yu commented on HBASE-7205:
-------------------------------

In RegionCoprocessorHost.postClose(), we can retrieve activeCoprocessorClassLoaders and release the (strong) references.
                
> Coprocessor classloader is replicated for all regions in the HRegionServer
> --------------------------------------------------------------------------
>
>                 Key: HBASE-7205
>                 URL: https://issues.apache.org/jira/browse/HBASE-7205
>             Project: HBase
>          Issue Type: Bug
>          Components: Coprocessors
>    Affects Versions: 0.92.2, 0.94.2
>            Reporter: Adrian Muraru
>            Assignee: Ted Yu
>            Priority: Critical
>             Fix For: 0.96.0, 0.94.4
>
>         Attachments: 7205-v1.txt, HBASE-7205_v2.patch
>
>
> HBASE-6308 introduced a new custom CoprocessorClassLoader to load the coprocessor classes and a new instance of this CL is created for each single HRegion opened. This leads to OOME-PermGen when the number of regions go above hundres / region server. 
> Having the table coprocessor jailed in a separate classloader is good however we should create only one for all regions of a table in each HRS.

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