[jira] Commented: (HADOOP-5958) Use JDK 1.6 File APIs in DF.java wherever possible

["Aaron Kimball (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-5958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768822#action_12768822 ] 

Aaron Kimball commented on HADOOP-5958:
---------------------------------------

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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