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From "Terry Siu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-4051) Table coprocessor loaded twice when region is initialized
Date Thu, 30 Jun 2011 23:03:28 GMT
Table coprocessor loaded twice when region is initialized
---------------------------------------------------------

                 Key: HBASE-4051
                 URL: https://issues.apache.org/jira/browse/HBASE-4051
             Project: HBase
          Issue Type: Bug
          Components: coprocessors
    Affects Versions: 0.92.0
         Environment: Ubuntu 11.04 64-bit
            Reporter: Terry Siu
             Fix For: 0.92.0


I'm debugging a prePut hook which I've implemented as part of the coprocessor work being developed.
This hook is loaded via a table COPROCESSOR attribute and I've noticed that the prePut method
is being called twice for a single Put. After setting up the region server to run in a debugger,
I'm noticing the call to loadTableCoprocessors() being invoked twice during region initialization,
specifically: 

1.       HRegion.init => RegionCoprocessorHost.init => RegionCoprocessorHost.loadTableCoprocessors


2.       ... => RegionCoprocessorHost.preOpen => RegionCoprocessorHost.loadTableCoprocessors


This results in two RegionEnvironment instances, each containing a new instance of my coprocessor,
being added to the RegionCoprocessorHost. When I issue a put, the list of RegionEnvironments
is iterated over and each calls the prePut method in my coprocessor. Reason why this is posing
a problem for me is that I modify the family map passed in to my prePut method. Since this
family map is the same instance used in both prePut calls, the second prePut call operates
on the modified family map, which leads to an unexpected result. 

Is the double loading of the same coprocessor class intentional, is this a bug?

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