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https://issues.apache.org/jira/browse/HBASE-3552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12999824#comment-12999824
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stack commented on HBASE-3552:
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+1 Looks good to me.
> Coprocessors Are Unable To Load If RegionServer is Launched Using a Different
> Classloader than System Default
> -------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-3552
> URL: https://issues.apache.org/jira/browse/HBASE-3552
> Project: HBase
> Issue Type: Bug
> Components: coprocessors, regionserver
> Affects Versions: 0.92.0
> Environment: Ubuntu 10.10 x86_32
> Reporter: Ed Kohlwey
> Assignee: Andrew Purtell
> Attachments: HBASE-3552.patch
>
>
> If a region server is launched in a context such that its classloader is
> different from the system class loader, then the Class object used to
> represent the Coprocessor interface of the coprocessor will be different than
> the Coprocessor Class object that is used by
> RegionCoprocessorHost.loadSystemCoprocessors() .
> There's a few options that come to mind to fix this problem:
> 1. Remove the logic where loadSystemCoprocessors changes the context's
> ClassLoader back to the system default classloader.
> 2. Remove the cast to Coprocessor in CoprocessorHost.load() and invoke
> methods via reflection.
> 3. Set the class loader back to the system default before launching any
> daemon threads.
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