[jira] [Commented] (TEZ-3758) Vertex can hang in RUNNING state when two task attempts finish very closely and have retroactive failures

["Siddharth Seth (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TEZ-3758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16047011#comment-16047011 ] 

Siddharth Seth commented on TEZ-3758:
-------------------------------------

cc [~aplusplus], [~harishjp]

> Vertex can hang in RUNNING state when two task attempts finish very closely and have retroactive failures
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: TEZ-3758
>                 URL: https://issues.apache.org/jira/browse/TEZ-3758
>             Project: Apache Tez
>          Issue Type: Bug
>    Affects Versions: 0.7.1, 0.9.0
>            Reporter: Kuhu Shukla
>            Assignee: Kuhu Shukla
>         Attachments: TEZ-3758.001.patch
>
>
> A vertex's count of what tasks are done can go off in a case where two task attempts finish very closely, say within a millisecond of each other. We had a case where this task, which was marked successful, never scheduled another attempt upon getting a retroactive failure since it thought it had one uncompleted task attempt already. This is because the attempt that finished 1 ms later transitioned to SUCCEEDED but we don't take any action on the taskAttempStatus data structure and it stays false. This JIRA will attempt to solve that race.



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