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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5835) Killing Task might cause the job to go to ERROR state
Date Sat, 26 Apr 2014 15:15:24 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13982017#comment-13982017
] 

Hudson commented on MAPREDUCE-5835:
-----------------------------------

FAILURE: Integrated in Hadoop-Mapreduce-trunk #1769 (See [https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1769/])
MAPREDUCE-5835. Killing Task might cause the job to go to ERROR state. Contributed by Ming
Ma (jlowe: http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1590168)
* /hadoop/common/trunk/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/job/impl/TaskImpl.java
* /hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/TestKill.java


> Killing Task might cause the job to go to ERROR state
> -----------------------------------------------------
>
>                 Key: MAPREDUCE-5835
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5835
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.4.0
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>            Priority: Critical
>             Fix For: 3.0.0, 2.4.1
>
>         Attachments: MAPREDUCE-5835.patch
>
>
> There could be a race condition if job is killed right after task attempt receives TA_DONE
event. In that case, TaskImpl might receive T_ATTEMPT_SUCCEEDED followed by T_ATTEMPTED_KILLED
for the same attempt, thus transition job to ERROR state.
> a. The task is in KILL_WAIT.
> b. TA receives TA_DONE event.
> c. Before TA transitions to SUCCEEDED state, Task sends TA_KILL event.
> d. TA transitions to SUCCEEDED state and thus send T_ATTEMPT_SUCCEEDED to the task. The
task transitions to KILLED state.
> e. TA processes TA_KILL event and sends T_ATTEMPT_KILLED to the task.
> f. When task is in KILLED state, it can't handle T_ATTEMPT_KILLED event, thus transition
job to ERROR state.



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