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Posted to common-dev@hadoop.apache.org by "Konstantin Shvachko (JIRA)" <ji...@apache.org> on 2006/03/02 01:12:42 UTC
[jira] Commented: (HADOOP-33) DF enhancement: performance and win
XP support
[ http://issues.apache.org/jira/browse/HADOOP-33?page=comments#action_12368399 ]
Konstantin Shvachko commented on HADOOP-33:
-------------------------------------------
This patch (DF2.patch) covers DF caching and reuse of the same instance of DF in FSDataset.
I removed main() from the DF class, and created class TestDF in the test directory.
Additionally, for those who want Windows XP/2003 df functionality without cygwin
I attach DF.java, which covers that and is ready for adding other OSs, if desired.
Just replace committed DF.java with the one attached.
> DF enhancement: performance and win XP support
> ----------------------------------------------
>
> Key: HADOOP-33
> URL: http://issues.apache.org/jira/browse/HADOOP-33
> Project: Hadoop
> Type: Improvement
> Components: fs, dfs
> Environment: Unix, Cygwin, Win XP
> Reporter: Konstantin Shvachko
> Priority: Minor
> Attachments: DF.patch, DFpatch.txt
>
> 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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