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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-8325) Add a ShutdownHookManager to be used by different components instead of the JVM shutdownhook
Date Fri, 27 Apr 2012 19:52:49 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-8325?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alejandro Abdelnur updated HADOOP-8325:
---------------------------------------

    Summary: Add a ShutdownHookManager to be used by different components instead of the JVM
shutdownhook  (was: remove FileSystem JVM shutdown hook that does closeAll())

IMO, Option #3 seems the best choice (updating summary to reflect that)
                
> Add a ShutdownHookManager to be used by different components instead of the JVM shutdownhook
> --------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-8325
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8325
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 2.0.0
>            Reporter: Alejandro Abdelnur
>            Assignee: Alejandro Abdelnur
>            Priority: Critical
>             Fix For: 2.0.0
>
>
> FileSystem adds a JVM shutdown hook when a filesystem instance is cached.
> MRAppMaster also uses a JVM shutdown hook, among other things, the MRAppMaster JVM shutdown
hook is used to ensure state are written to HDFS.
> This creates a race condition because each JVM shutdown hook is a separate thread and
if there are multiple JVM shutdown hooks there is not assurance of order of execution, they
could even run in parallel.

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