Hyunsik Choi created TAJO-1020:
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             Summary: TajoContainerProxy::assignExecutionBlock causes NPE by 
race condition.
                 Key: TAJO-1020
                 URL: https://issues.apache.org/jira/browse/TAJO-1020
             Project: Tajo
          Issue Type: Bug
            Reporter: Hyunsik Choi
            Priority: Critical
             Fix For: 0.9.0


When some classes using KeyValueProto is being used for a concurrent manner. 
The member variable 'builder' in KeyValueProto causes race condition. As a 
result, builder can cause NPE.

This is an urgent issue. Please review it as soon as possible. 



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