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Date: Fri, 3 Aug 2012 22:07:02 +0000 (UTC)
From: "Steve Loughran (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HADOOP-8650) /bin/hadoop-daemon.sh to add "-f
 <timeout>" arg for forced shutdowns
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    [ https://issues.apache.org/jira/browse/HADOOP-8650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428411#comment-13428411 ] 

Steve Loughran commented on HADOOP-8650:
----------------------------------------

in HA environments, and other situations, you may want to forcibly shut down a hadoop service -even if it is hung. Currently, hadoop-daemon.sh sends a normal SIGTERM signal -one that the process picks up and reacts to.


If the process is completely hung, it is possible that this signal is not acted on, so it stays up. The only way to deal with this is by waiting a while, finding the pid and kill -9'ing it. This must be done by hand, or in an external script. The latter is brittle to changes in HADOOP_PID_DIR values, and requires everyone writing such scripts to code and test it themselves.

To replicate this: 
 # start a daemon: {{hadoop-daemon.sh start namenode}}
 # issue a {{kill -STOP <pid>}} to it's PID
 # try to stop the daemon via the {{hadoop-daemon.sh stop namenode}} command.
 # observe that the NN process remains present.

We could extend hadoop-daemon to support a "-f timeout" argument, which provides a timeout after which the process must be terminated, else a kill -9 signal is issued.
                
> /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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