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From "Sudheesh Katkam (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-3190) Invalid FragmentState transition from CANCELLATION_REQUESTED in QueryManager
Date Fri, 29 May 2015 20:46:18 GMT

    [ https://issues.apache.org/jira/browse/DRILL-3190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14565369#comment-14565369

Sudheesh Katkam commented on DRILL-3190:

Review board: https://reviews.apache.org/r/34829/

> Invalid FragmentState transition from CANCELLATION_REQUESTED in QueryManager
> ----------------------------------------------------------------------------
>                 Key: DRILL-3190
>                 URL: https://issues.apache.org/jira/browse/DRILL-3190
>             Project: Apache Drill
>          Issue Type: Bug
>          Components: Execution - Flow
>            Reporter: Sudheesh Katkam
>            Assignee: Sudheesh Katkam
>             Fix For: 1.1.0
>         Attachments: DRILL-3190.1.patch.txt
> If a fragment is cancelled as soon as it starts running, there are two state change messages
that are reported to the QueryManager: transition to RUNNING and transition to CANCELLATION_REQUESTED.

> The order of receiving these messages is not guaranteed because the messages *can be*
reported from different threads. The QueryManager#FragmentStateListener does not check for
a transition from CANCELLATION_REQUESTED to RUNNING. This state change should not happen in

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