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https://issues.apache.org/jira/browse/HBASE-7205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510166#comment-13510166
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Adrian Muraru commented on HBASE-7205:
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[~ted_yu] This is really similar with my wip patch - unfortunately I did not
find enough time to clean it up until now.
Couple of comments on your patch
{noformat}101 + if (clsLoaderCache.containsKey(path)) {{noformat}
1. CPH.load() is executed concurrently from multiple RS threads so
clsLoaderCache needs to be synchronized/ConcurrentHashMap.
2. We need a way to drop cached classloaders that are not being used by any
online Region.
> 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-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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