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https://issues.apache.org/jira/browse/HADOOP-8650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13429303#comment-13429303
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Steve Loughran commented on HADOOP-8650:
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Well spotted, that is in trunk from HADOOP-8353; backporting that to branch-1 
could be a first step. adding the sleep & poll is feature creep, but one that 
would deliver a faster shutdown
                
> /bin/hadoop-daemon.sh to add "-f <timeout>" arg for forced shutdowns 
> ---------------------------------------------------------------------
>
>                 Key: HADOOP-8650
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8650
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 1.0.3, 2.2.0-alpha
>            Reporter: Steve Loughran
>
> Add a timeout for the daemon script to trigger a kill -9 if the clean 
> shutdown fails.

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