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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5958) Use JDK 1.6 File APIs in DF.java wherever possible
Date Thu, 22 Oct 2009 20:04:59 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768848#action_12768848
] 

Doug Cutting commented on HADOOP-5958:
--------------------------------------

> Remove the inheritance from Shell? (incompatible change)

I'd be surprised if this broke any applications.  It would indeed be safer to add the dummy
methods, deprecated, and file an issue to remove them attached to the next release, but that
feels like overkill here.  Does any code in Hadoop depend on it extending Shell?

Does java.io.File let you find the mount point?  I thought we used that in places, but perhaps
not.  I guess if it's used then we might still need to use the 'df' command to support that,
although perhaps we could avoid it for the other methods.

> 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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