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https://issues.apache.org/jira/browse/HADOOP-7973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13185683#comment-13185683
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Daryn Sharp commented on HADOOP-7973:
-------------------------------------

It's unclear what all changes transpired, but somehow oozie MR tasks used a DFS 
uri w/o a port for in/out dirs, while the task code used the 
{{fs.default.name}} which does include the port.  The problem was masked due to 
two distinct filesystem instances.  If filesystem is fixed to return the same 
object for a uri with and w/o the default port, then the problem comes back 
again.
                
> DistributedFileSystem close has severe consequences
> ---------------------------------------------------
>
>                 Key: HADOOP-7973
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7973
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>    Affects Versions: 1.0.0
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>            Priority: Blocker
>
> The way {{FileSystem#close}} works is very problematic.  Since the 
> {{FileSystems}} are cached, any {{close}} by any caller will cause problems 
> for every other reference to it.  Will add more detail in the comments.

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