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https://issues.apache.org/jira/browse/MAPREDUCE-3528?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13183255#comment-13183255
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Hudson commented on MAPREDUCE-3528:
-----------------------------------

Integrated in Hadoop-Mapreduce-trunk #954 (See 
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/954/])
    MAPREDUCE-3528. Fixed TaskHeartBeatHandler to use a new configuration for 
the thread loop interval separate from task-timeout configuration property. 
(Siddharth Seth via vinodkv)

vinodkv : 
http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1229403
Files : 
* /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/TaskHeartbeatHandler.java
* 
/hadoop/common/trunk/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MRJobConfig.java

                
> The task timeout check interval should be configurable independent of 
> mapreduce.task.timeout
> --------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3528
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3528
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mr-am, mrv2
>    Affects Versions: 0.23.0
>            Reporter: Siddharth Seth
>            Assignee: Siddharth Seth
>             Fix For: 0.23.1
>
>         Attachments: MR3528.txt
>
>
> TaskHeartbeatHandler sleeps for 'mapreduce.task.timeout' - between each 
> check. If a task/NM goes bad immediately after starting a task - the timeout 
> is detected in ~2x the configured timeout interval.

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