[jira] [Resolved] (HDFS-5211) Race condition between DistributedFileSystem#close and FileSystem#close can cause return of a closed DistributedFileSystem instance from the FileSystem cache.

["Chris Nauroth (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-5211?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Nauroth resolved HDFS-5211.
---------------------------------

       Resolution: Fixed
    Fix Version/s: 1.3.0
                   1-win
     Hadoop Flags: Reviewed

I have committed this to branch-1 and branch-1-win.  Thanks to Xi and Nicholas for code reviews.
                
> Race condition between DistributedFileSystem#close and FileSystem#close can cause return of a closed DistributedFileSystem instance from the FileSystem cache.
> --------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-5211
>                 URL: https://issues.apache.org/jira/browse/HDFS-5211
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 1.2.1
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>             Fix For: 1-win, 1.3.0
>
>         Attachments: HDFS-5211.1.patch, HDFS-5211.2.patch
>
>
> {{DistributedFileSystem#close}} closes the underlying {{DFSClient}} before the superclass call to {{FileSystem#close}}, which removes the instance from the cache.  This leaves a small window during which another thread can call {{FileSystem#get}} and receive the closed instance from the cache.

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