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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9941) The context ClassLoader isn't set while calling into a coprocessor
Date Fri, 03 Jan 2014 18:02:02 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13861724#comment-13861724
] 

Andrew Purtell commented on HBASE-9941:
---------------------------------------

bq. How do I interpret these readings ?

That adding the classloader switching adds ~90ns per upcall.

bq. Log the exception above ?

It's a microbenchmark, this isn't needed or desired.




> The context ClassLoader isn't set while calling into a coprocessor
> ------------------------------------------------------------------
>
>                 Key: HBASE-9941
>                 URL: https://issues.apache.org/jira/browse/HBASE-9941
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Coprocessors
>    Affects Versions: 0.96.0
>            Reporter: Benoit Sigoure
>            Assignee: Andrew Purtell
>             Fix For: 0.98.0
>
>         Attachments: 9941.patch, 9941.patch
>
>
> Whenever one of the methods of a coprocessor is invoked, the context {{ClassLoader}}
isn't set to be the {{CoprocessorClassLoader}}.  It's only set properly when calling the coprocessor's
{{start}} method.  This means that if the coprocessor code attempts to load classes using
the context {{ClassLoader}}, it will fail to find the classes it's looking for.



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