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https://issues.apache.org/jira/browse/HADOOP-4655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12681455#action_12681455
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Doug Cutting commented on HADOOP-4655:
--------------------------------------

> Since this patch adds new API (without changing existing APIs), it is safe to 
> pull this into 0.20. 

Except we don't add new features to branches, but only to trunk, right?

Also, what's the use case for newInstanceLocal()?  I can't think of one and 
would prefer not to add that method.

> FileSystem.CACHE should be ref-counted
> --------------------------------------
>
>                 Key: HADOOP-4655
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4655
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: dfs, fs
>    Affects Versions: 0.18.1, 0.18.2, 0.19.0, 0.19.1, 0.20.0
>            Reporter: Hong Tang
>            Assignee: dhruba borthakur
>             Fix For: 0.20.0
>
>         Attachments: FileSystemUnique.patch, FileSystemUnique.txt, 
> FileSystemUnique2.txt
>
>
> FileSystem.CACHE is not ref-counted, and could lead to resource leakage.

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