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From Ramya Nimmagadda <Ramya.Nimmaga...@microsoft.com>
Subject RE: Building branch-1-win, Starting Datanode on Windows
Date Mon, 04 Mar 2013 20:40:32 GMT
Hi Daniel,

This can happen when "data" directory permissions are different from default (755). Possible
reasons could be: 

1. This directory already exists but created with different permissions . One scenario I can
think of : The directory got created as part of build workflow, and the permissions are inherited
from parent (C:\Hadoop) 
2. The datanode service tried to create this (if it does not exist) and failed while setting
permissions using "winutils". This case can be verified by looking at the DN log for FSShell
exceptions 

To further investigate the root cause, it would help to find out who exactly  created this
directory. As Bikas mentioned, can you go through the logs for any exceptions related to permissions?


Thanks,
Ramya

-----Original Message-----
From: Bikas Saha [mailto:bikas@hortonworks.com] 
Sent: Monday, March 04, 2013 10:44 AM
To: common-dev@hadoop.apache.org
Subject: RE: Building branch-1-win, Starting Datanode on Windows

I don't think you need to manually set permissions on Hadoop directories.
Did you build the native windows executable in your build? Do you see any exceptions mentioning
winutils?

Bikas

-----Original Message-----
From: Daniel Jones [mailto:daniel.jones@opencredo.com]
Sent: Monday, March 04, 2013 6:56 AM
To: common-dev@hadoop.apache.org
Subject: Building branch-1-win, Starting Datanode on Windows

Hi all,

I've cloned the branch-1-win branch of Hadoop, and successfully managed to build it on my
Windows 8 machine.
When trying to start a datanode instance, I get the following error:

13/03/04 14:42:47 WARN datanode.DataNode: Invalid directory in
dfs.data.dir: Incorrect permission for C:/hadoop/data, expected:
rwxr-xr-x, while actual: ------rwx
13/03/04 14:42:47 ERROR datanode.DataNode: All directories in dfs.data.dir are invalid.

The directory exists, and I've set "Allow all" to Everyone.

Is this an issue that should exist in the Windows branch? Is there a way to massage Windows'
file permissions into something the datanode will accept without further modifications to
the code?

Many thanks in advance.
--
Daniel Jones - Consultant
Open Credo Ltd - Excellence in Enterprise Application Development

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