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https://issues.apache.org/jira/browse/HBASE-7205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13529175#comment-13529175
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Gary Helmling commented on HBASE-7205:
--------------------------------------
There are indeed parts of SortedCopyOnWriteSet that are not thread safe due to
leaked references to the TreeSet implementation. I opened HBASE-7326 to fix.
From a quick review of the trunk code, though, there is nothing (yet) using
SortedCopyOnWriteSet in an unsafe way.
> 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-v10.txt, 7205-v1.txt, 7205-v3.txt, 7205-v4.txt,
> 7205-v5.txt, 7205-v6.txt, 7205-v7.txt, 7205-v8.txt, 7205-v9.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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