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Date: Wed, 20 May 2009 05:55:45 -0700 (PDT)
From: "Tom White (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-4829) Allow FileSystem shutdown hook to
 be disabled
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    [ https://issues.apache.org/jira/browse/HADOOP-4829?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12711130#action_12711130 ] 

Tom White commented on HADOOP-4829:
-----------------------------------

Todd.

This patch no longer applies following the changes to the test source tree. Could you please generate a new version?

> Allow FileSystem shutdown hook to be disabled
> ---------------------------------------------
>
>                 Key: HADOOP-4829
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4829
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: fs
>    Affects Versions: 0.18.1
>            Reporter: Bryan Duxbury
>            Priority: Minor
>         Attachments: hadoop-4829-v2.txt, hadoop-4829.txt
>
>
> FileSystem sets a JVM shutdown hook so that it can clean up the FileSystem cache. This is great behavior when you are writing a client application, but when you're writing a server application, like the Collector or an HBase RegionServer, you need to control the shutdown of the application and HDFS much more closely. If you set your own shutdown hook, there's no guarantee that your hook will run before the HDFS one, preventing you from taking some shutdown actions.
> The current workaround I've used is to snag the FileSystem shutdown hook via Java reflection, disable it, and then run it on my own schedule. I'd really appreciate not having to do take this hacky approach. It seems like the right way to go about this is to just to add a method to disable the hook directly on FileSystem. That way, server applications can elect to disable the automatic cleanup and just call FileSystem.closeAll themselves when the time is right.

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