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https://issues.apache.org/jira/browse/HADOOP-10792?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14054642#comment-14054642
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Steve Loughran commented on HADOOP-10792:
-----------------------------------------

I feel your pain, as I've hit it too. You can ask for a non-shared copy of a 
FileSystem instance by setting the property "fs.%s.impl.disable.cache" for the 
config you use when you ask for the FS. I recommend you do that in libraries, 
or rely on the JVM shutdown logic to trigger cleanup.

> Add FileSystem#closeIfNotReferred method
> ----------------------------------------
>
>                 Key: HADOOP-10792
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10792
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs
>            Reporter: Kousuke Saruta
>
> FileSystem#close closes FileSystem even if the same instance of FileSystem is 
> referred by someone.
> For instance, a library using FileSystem calls FileSystem.get, and a program 
> using the library calls FileSystem.get, both of instances of FileSystem is 
> same. 
> When the library and the program is implemented as different threads and one 
> calls FileSystem.close, another fails most of operations of FileSystem.
> So, we need the method like cloesIfNotReferred, which closes FileSystem only 
> if a instance of FileSystem is not referred by anyone.



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