[jira] [Reopened] (TEZ-2426) Ensure the eventRouter thread completes before switching to a new task and thread safety fixes in IPOContexts.

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

     [ https://issues.apache.org/jira/browse/TEZ-2426?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Siddharth Seth reopened TEZ-2426:
---------------------------------

> Ensure the eventRouter thread completes before switching to a new task and thread safety fixes in IPOContexts.
> --------------------------------------------------------------------------------------------------------------
>
>                 Key: TEZ-2426
>                 URL: https://issues.apache.org/jira/browse/TEZ-2426
>             Project: Apache Tez
>          Issue Type: Bug
>    Affects Versions: 0.7.0
>            Reporter: Bikas Saha
>            Assignee: Siddharth Seth
>            Priority: Critical
>             Fix For: 0.7.0
>
>         Attachments: TEZ-2426-3.patch, TEZ-2426.1.txt, TEZ-2426.2.txt, am.log, container.log
>
>
> Sequence of events
> 1) Task A starts in a container
> 2) Task A complete event comes to AM
> 3) Task B starts in the same container
> 4) Task A's input calls some method on its context. Crashes with NPE
> 5) The crash sends an input failed event for Task A to the AM
> 6) Task A state machine crashes saying cannot handle failed after success
> In some cases, it could be that status update event is also sent after completion, though not sure if its related to the failed event being sent.



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