Cheolsoo Park created PIG-3471:
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             Summary: Add a base abstract class for ExecutionEngine
                 Key: PIG-3471
                 URL: https://issues.apache.org/jira/browse/PIG-3471
             Project: Pig
          Issue Type: Sub-task
          Components: tez
    Affects Versions: tez-branch
            Reporter: Cheolsoo Park
            Assignee: Cheolsoo Park
             Fix For: tez-branch


While implementing TezExecutionEngine, I realized that a lot of code can be 
shared between MRExecutionEngine and TezExecutionEngine because both use the 
common Hadoop framework (hdfs, resource manager, etc). So it would make sense 
to create a base abstract class for them (called HExecutionEngine) and have 
them inherit common methods and fields from it.

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