[jira] Commented: (HADOOP-33) DF enhancement: performance and win XP support

["Jean-François Ménard (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-33?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12556354#action_12556354 ] 

Jean-François Ménard commented on HADOOP-33:
--------------------------------------------

The result of 'fsutil' is localised.

On my french windows XP, the result is:

Nombre total d'octets libres             : 23775694848
Nombre total d'octets                    : 143913521152
Nombre total d'octets libres disponibles  : 23775694848

I modified DF.java accordingly for my needs, but if the order of lines is always the same, I guess that parsing the lines sequentially should do the trick.

> DF enhancement: performance and win XP support
> ----------------------------------------------
>
>                 Key: HADOOP-33
>                 URL: https://issues.apache.org/jira/browse/HADOOP-33
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs, fs
>    Affects Versions: 0.1.0
>         Environment: Unix, Cygwin, Win XP
>            Reporter: Konstantin Shvachko
>            Assignee: Konstantin Shvachko
>            Priority: Minor
>             Fix For: 0.1.0
>
>         Attachments: DF.java, DF5.patch
>
>
> 1. DF is called twice for each heartbeat, which happens each 3 seconds.
> There is a simple fix for that in the attached patch.
> 2. cygwin is required to run df program in windows environment.
> There is a class org.apache.commons.io.FileSystemUtils, which can return disk free space
> for different OSs, but it does not have means to get disk capacity.
> In general in windows there is no efficient and uniform way to calculate disk capacity
> using a shell command.
> The choices are 'chkdsk' and 'defrag -a', but both of them are too slow to be called
> every 3 seconds.
> WinXP and 2003 server have a new tool called fsutil, which provides all necessary info.
> I implemented a call to fsutil in case df fails, and the OS is right.
> Other win versions should still run cygwin.
> I tested this fetaure for linux, winXP and cygwin.
> See attached patch.

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