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From "Ivan Mitic (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5330) JVM manager should not forcefully kill the process on Signal.TERM on Windows
Date Tue, 18 Jun 2013 23:46:20 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ivan Mitic updated MAPREDUCE-5330:
----------------------------------

    Summary: JVM manager should not forcefully kill the process on Signal.TERM on Windows
 (was: Killing M/R JVM's leads to metrics not being uploaded)
    
> JVM manager should not forcefully kill the process on Signal.TERM on Windows
> ----------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5330
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5330
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 1-win
>         Environment: Windows
>            Reporter: Xi Fang
>            Assignee: Xi Fang
>         Attachments: MAPREDUCE-5330.patch
>
>
> In MapReduce, we sometimes kill a task's JVM before it naturally shuts down if we want
to launch other tasks (look in JvmManager$JvmManagerForType.reapJvm). This behavior means
that if the map task process is in the middle of doing some cleanup/finalization after the
task is done, it might be interrupted/killed without giving it a chance. 
> In the Microsoft's Hadoop Service, after a Map/Reduce task is done and during closing
file systems in a special shutdown hook, we're typically uploading storage (ASV in our context)
usage metrics to Microsoft Azure Tables. So if this kill happens these metrics get lost. The
impact is that for many MR jobs we don't see accurate metrics reported most of the time.

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