[jira] [Created] (PIG-3539) Pig should be able to submit multiple DAG

["Daniel Dai (JIRA)" <ji...@apache.org>]

Daniel Dai created PIG-3539:
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             Summary: Pig should be able to submit multiple DAG
                 Key: PIG-3539
                 URL: https://issues.apache.org/jira/browse/PIG-3539
             Project: Pig
          Issue Type: Sub-task
          Components: tez
            Reporter: Daniel Dai
            Assignee: Daniel Dai
             Fix For: tez-branch


There could be several scenario Pig want to submit multiple DAG:
1. a blocking operator in grunt
2. a blocking operator in script (exec, fs)
3. break a DAG into two for possible inner DAG optimization

Pig should use TezSession so that we can reuse AM. TezSession should be a thread local variable. For those who use Pig Java API, they will use the same AM within a thread, but different AM in another thread.



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