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From "Victoria Markman (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-3493) Alter session command with an option to cancel query in a particular phase of execution
Date Fri, 11 Sep 2015 16:07:45 GMT

    [ https://issues.apache.org/jira/browse/DRILL-3493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14741035#comment-14741035
] 

Victoria Markman commented on DRILL-3493:
-----------------------------------------

Yes, exception injector throwing OOM will test cancellation implicitly and this is very important
test. However, having forman cancel query when reached cancellation site is a different test.
It's much closer to cancellation user is going to issue explicitly.
We will only be able to test on a single node, but that's a good way to start, plus we will
be able to have automated test suite.

> Alter session command with an option to cancel query in a particular phase of execution
> ---------------------------------------------------------------------------------------
>
>                 Key: DRILL-3493
>                 URL: https://issues.apache.org/jira/browse/DRILL-3493
>             Project: Apache Drill
>          Issue Type: New Feature
>          Components: Execution - Flow
>            Reporter: Victoria Markman
>            Assignee: Deneche A. Hakim
>            Priority: Blocker
>             Fix For: 1.3.0
>
>
> This proposal is to implement: 
> "alter session cancel <execution phase> = true|false".
> where <execution phase> is an entry point for query cancellation, like say "sort"
or "disk based sort" , etc.
> When this option is set, if query reaches this point, forman would issue cancel.
> This way: we can easily test correctness of query cancellation in different types of
queries.



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