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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-33) DF enhancement: performance and win XP support
Date Tue, 25 Jul 2006 20:18:14 GMT
     [ http://issues.apache.org/jira/browse/HADOOP-33?page=all ]

Konstantin Shvachko updated HADOOP-33:
--------------------------------------

    Attachment: DF.java

I'm updating the universal version of DF.java to reflect changes introduced by HADOOP-344.
DF is hadoop's only dependency on cygwin not counting the scripts.
In order to run it on windows XP (without cygwin) you need to replace DF.java with the
file attached.


> DF enhancement: performance and win XP support
> ----------------------------------------------
>
>                 Key: HADOOP-33
>                 URL: http://issues.apache.org/jira/browse/HADOOP-33
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: fs, dfs
>    Affects Versions: 0.1.0
>         Environment: Unix, Cygwin, Win XP
>            Reporter: Konstantin Shvachko
>         Assigned To: 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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