Sergey Shelukhin updated HIVE-17256:
    Attachment: HIVE-17256.01.patch

> add a notion of a guaranteed task to LLAP
> -----------------------------------------
>                 Key: HIVE-17256
>                 URL: https://issues.apache.org/jira/browse/HIVE-17256
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Sergey Shelukhin
>            Assignee: Sergey Shelukhin
>         Attachments: HIVE-17256.01.patch, HIVE-17256.patch
> Tasks are basically on two levels, guaranteed and speculative, with 
> speculative being the default. As long as noone uses the new flag, the tasks 
> behave the same.
> All the tasks that do have the flag also behave the same with regard to each 
> other.
> The difference is that a guaranteed task is always higher priority, and 
> preempts, a speculative task. 

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