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https://issues.apache.org/jira/browse/HBASE-7205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13503304#comment-13503304
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Andrew Purtell commented on HBASE-7205:
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CoprocessorClassLoader extends URLClassloader, and is used the same way.
Reverting doesn't make sense if the effects in PermGen are not a consequence of
this change.
We need a test for checking PermGen use in the presence of coprocessors or not
- open a few hundred regions and see.
The suggestion to cache the CP classloader according to CP path is a good one,
we should pursue that because we don't support replacing jars out underneath
the RS after a CP is loaded anyway.
> 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
> Priority: Critical
> Fix For: 0.96.0, 0.94.4
>
>
> 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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