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https://issues.apache.org/jira/browse/HIVE-18326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16317403#comment-16317403
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Siddharth Seth commented on HIVE-18326:
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On DAG itself - I think this is the only place. That's a core component
internal to Tez. I would be very careful about depending on this. I know
there's other places where Tez internals are used - they're mostly from the
runtime though.
I think a Tez API specific change can be made. In fact TEZ-3770 will likely go
in without API changes, which I had asked for there as well.
> LLAP Tez scheduler - only preempt tasks if there's a dependency between them
> ----------------------------------------------------------------------------
>
> Key: HIVE-18326
> URL: https://issues.apache.org/jira/browse/HIVE-18326
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
> Fix For: 3.0.0
>
> Attachments: HIVE-18326.01.patch, HIVE-18326.02.patch,
> HIVE-18326.02.patch, HIVE-18326.patch
>
>
> It is currently possible for e.g. two sides of a union (or a join for that
> matter) to have slightly different priorities. We don't want to preempt
> running tasks on one side in favor of the other side in such cases.
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