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https://issues.apache.org/jira/browse/HADOOP-8656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13429338#comment-13429338
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Steve Loughran commented on HADOOP-8656:
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If you suspend a hadoop daemon with a {{kill -STOP $pid}}, the {{service
hadoop-namenode stop}} operation will not actually terminate the process -it
issues a kill -TERM "hint".
HADOOP-8353 forces the shutdown with a sleep followed by a kill -9 if there is
a process with that pid still listed. This forces the shutdown, and should have
no adverse side effects provided that Pid doesn't get reused during the sleep
phase.
This JIRA covers backporting it to 1.1 and trunk
> backport forced daemon shutdown of HADOOP-8353 into branch-1
> ------------------------------------------------------------
>
> Key: HADOOP-8656
> URL: https://issues.apache.org/jira/browse/HADOOP-8656
> Project: Hadoop Common
> Issue Type: Improvement
> Affects Versions: 1.0.3
> Environment: init.d
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Minor
> Fix For: 1.1.0
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> the init.d service shutdown code doesn't work if the daemon is hung
> -backporting the portion of HADOOP-8353 that edits bin/hadoop-daemon.sh
> corrects this
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