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https://issues.apache.org/jira/browse/HBASE-7205?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13510241#comment-13510241
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Ted Yu commented on HBASE-7205:
-------------------------------
{code}
+ classLoaders.add(cl);
{code}
I only found one reference to classLoaders, shown above. I wonder what purpose
classLoaders would serve.
{code}
+ protected Set<ClassLoader> classLoaders = new HashSet<ClassLoader>();
+ static ConcurrentMap<Path, ClassLoader> classLoadersCache = new MapMaker()
{code}
Shouldn't the above be declared as static ? (CoprocessorHost is per-region).
I think we can unload ClassLoader from the cache using DeleteTableHandler and
DisableTableHandler.
The assumption is that different tables have different schemas. Coprocessor for
one table wouldn't directly fit another table.
> 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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