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From "Eli Collins (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (HADOOP-3818) Not possible to access a FileSystem from within a ShutdownHook
Date Thu, 11 Aug 2011 18:40:27 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-3818?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Eli Collins resolved HADOOP-3818.
---------------------------------

    Resolution: Won't Fix

Out of date

> Not possible to access a FileSystem from within a ShutdownHook
> --------------------------------------------------------------
>
>                 Key: HADOOP-3818
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3818
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 0.17.1
>            Reporter: Rowan Nairn
>            Priority: Minor
>
> FileSystem uses addShutdownHook to close all FileSystems at exit.  This makes it impossible
to access a FileSystem from within your own ShutdownHook threads, say for deleting incomplete
output.  Using a pre-existing FileSystem object is unsafe since it may be closed by the time
the thread executes.  Using FileSystem.get(...) results in an exception:
> Exception in thread "Thread-10" java.lang.IllegalStateException: Shutdown in progress
> 	at java.lang.Shutdown.add(Shutdown.java:81)
> 	at java.lang.Runtime.addShutdownHook(Runtime.java:190)
> 	at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1293)
> 	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:203)
> 	at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:108)

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