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From "Segel, Mike" <mse...@navteq.com>
Subject RE: Stopping datanodes dynamically.
Date Mon, 31 Jan 2011 17:22:25 GMT
Well he didn't say he wanted to decommission the node, just stop it independently of the name
node. ;-)

-----Original Message-----
From: Koji Noguchi [mailto:knoguchi@yahoo-inc.com] 
Sent: Monday, January 31, 2011 11:16 AM
To: common-dev@hadoop.apache.org
Subject: Re: Stopping datanodes dynamically.

If you want to decommission a datanode,

http://hadoop.apache.org/common/docs/r0.20.0/hdfs_user_guide.html#DFSAdmin+Command
-refreshNodes  briefly explains how it works.

Koji


On 1/31/11 4:35 AM, "Segel, Mike" <msegel@navteq.com> wrote:

James,

Remove the node without stopping what?

If you mean you want to remove the data node without stopping the master, you have a couple
of ways...

First, if you're running Cloudera's CDH3b3 release you have /etc/init.d scripts where you
can issue a stop command.
(Stopping the datanode and the task tracker job.)

Or you could use a kill -9 , or a killall -9 java to stop the processes.

After 10 minutes the name node sees the data node as non-responsive and marks it as down.
If you want to remove the data node permanently, there are other steps....


HTH

-Mike

________________________________________
From: James Ram [hadooprj@gmail.com]
Sent: Monday, January 31, 2011 3:02 AM
To: common-dev@hadoop.apache.org
Subject: Stopping datanodes dynamically.

Hi,

Can anyone please answer the question. How to remove the datanodes
dynamically from the masternode without stopping it?


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