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Date: Thu, 22 Oct 2009 19:29:59 +0000 (UTC)
From: "Aaron Kimball (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Subject: [jira] Commented: (HADOOP-5958) Use JDK 1.6 File APIs in DF.java
 wherever possible
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    [ https://issues.apache.org/jira/browse/HADOOP-5958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768828#action_12768828 ] 

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

Another question: o.a.h.fs.DF currently inherits the public interface of o.a.h.util.Shell; this would be irrelevant if usage of the "df" command itself were eliminated. Should we:

a) Remove the inheritance from Shell? (incompatible change)
b) Override all the Shell methods with dummies that return meaningless data (e.g., for getExitCode())
c) ...or?

> 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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