Mithun Radhakrishnan updated HIVE-17273:
    Attachment: HIVE-17273.1.patch

Here's the initial crack at a fix.

> MergeFileTask needs to be interruptible
> ---------------------------------------
>                 Key: HIVE-17273
>                 URL: https://issues.apache.org/jira/browse/HIVE-17273
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 2.2.0, 3.0.0
>            Reporter: Mithun Radhakrishnan
>            Assignee: Mithun Radhakrishnan
>         Attachments: HIVE-17273.1.patch
> 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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