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https://issues.apache.org/jira/browse/HADOOP-5958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768931#action_12768931
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Doug Cutting commented on HADOOP-5958:
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> That means we'd need to put most of the current DF's logic into some other 
> class that extends Shell; maybe a private inner class?

Works for me.  Delegation.

> Use JDK 1.6 File APIs in DF.java wherever possible
> --------------------------------------------------
>
>                 Key: HADOOP-5958
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5958
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: fs
>            Reporter: Devaraj Das
>             Fix For: 0.21.0
>
>
> JDK 1.6 has File APIs like File.getFreeSpace() which should be used instead 
> of spawning a command process for getting the various disk/partition related 
> attributes. This would avoid spikes in memory consumption by tasks when 
> things like LocalDirAllocator is used for creating paths on the filesystem.

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