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https://issues.apache.org/jira/browse/HADOOP-5958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768822#action_12768822
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Aaron Kimball commented on HADOOP-5958:
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Do we want to use {{File.getFreeSpace()}} or {{File.getUsableSpace()}}? The API
docs (http://java.sun.com/javase/6/docs/api/java/io/File.html) are pretty vague
about what "usable" means. A quick test on my machine shows that they do return
different values, by about 6%.
> 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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