Mithun Radhakrishnan created HIVE-17273:

             Summary: MergeFileTask needs to be interruptible
                 Key: HIVE-17273
             Project: Hive
          Issue Type: Bug
    Affects Versions: 2.2.0, 3.0.0
            Reporter: Mithun Radhakrishnan
            Assignee: Mithun Radhakrishnan

This is an extension to the work done in HIVE-16820 (which made {{TezTask}} 
exit correctly when the job is cancelled.)

If a Hive job involves a {{MergeFileTask}} (say {{ALTER TABLE ... PARTITION ... 
CONCATENATE}}), and is cancelled *after* the merge-task has kicked off, then 
the merge-task might not be cancelled, and might run through to completion.

The code should check if the merge-job has already been scheduled, and cancel 
it if required.

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