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https://issues.apache.org/jira/browse/YARN-2853?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14212287#comment-14212287
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Hudson commented on YARN-2853:
------------------------------

SUCCESS: Integrated in Hadoop-Hdfs-trunk #1933 (See 
[https://builds.apache.org/job/Hadoop-Hdfs-trunk/1933/])
YARN-2853. Fixed a bug in ResourceManager causing apps to hang when the user 
kill request races with ApplicationMaster finish. Contributed by Jian He. 
(vinodkv: rev 3651fe1b089851b38be351c00a9899817166bf3e)
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/TestRM.java
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/ApplicationMasterService.java
* 
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/TestRMAppTransitions.java
* hadoop-yarn-project/CHANGES.txt
YARN-2853. Merging to branch-2.6 for hadoop-2.6.0-rc1. (acmurthy: rev 
d648e60ebab7f1942dba92e9cd2cb62b8d70419b)
* hadoop-yarn-project/CHANGES.txt


> Killing app may hang while AM is unregistering
> ----------------------------------------------
>
>                 Key: YARN-2853
>                 URL: https://issues.apache.org/jira/browse/YARN-2853
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Jian He
>            Assignee: Jian He
>             Fix For: 2.6.0
>
>         Attachments: YARN-2853.1.patch, YARN-2853.1.patch, YARN-2853.2.patch, 
> YARN-2853.3.patch
>
>
> When killing an app, app first moves to KILLING state, If RMAppAttempt 
> receives the attempt_unregister event before attempt_kill event,  it'll 
> ignore the later attempt_kill event.  Hence, RMApp won't be able to move to 
> KILLED state and stays at KILLING state forever.



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