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https://issues.apache.org/jira/browse/HADOOP-4374?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12689366#action_12689366
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Amareshwari Sriramadasu commented on HADOOP-4374:
-------------------------------------------------

One minor comment:
After removing System.exit call from shutdown hook, I don't think you need 2 
catch blocks in shutdown hook. Also log Throwable as String by calling 
StringUtils.stringifyException(th)

> JVM should not be killed but given an opportunity to exit gracefully
> --------------------------------------------------------------------
>
>                 Key: HADOOP-4374
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4374
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>    Affects Versions: 0.19.0
>            Reporter: Devaraj Das
>            Assignee: Ravi Gummadi
>             Fix For: 0.20.0
>
>         Attachments: HADOOP-4374.patch, HADOOP-4374.v1.patch
>
>
> When the tasktracker picks an idle JVM for purging, it should signal the JVM 
> to exit gracefully, rather than forcefully killing it. This might have the 
> unfortunate side effect of logs not fully flushed yet in some cases.

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