hi Ramya
Setup topology.script.file.name in your hadoop-site.xml and the script.
check http://hadoop.apache.org/core/docs/current/cluster_setup.html ,
Hadoop Rack Awareness section.
Hi Lohit,
I have not set the datanode to tell namenode which rack it belongs to.
Can you please tell me how do I do it? Is it using setNetworkLocation()?
My intention is to kill the datanodes in a given rack. So it would be
useful even if I obtain the subnet each datanode belongs to.
Thanks
Ramya
-----Original Message-----
From: lohit [mailto:[EMAIL PROTECTED]
Sent: Wednesday, November 26, 2008 12:26 PM
To: core-user@hadoop.apache.org
Subject: Re: How to retrieve rack ID of a datanode
/default-rack is set when datanode has not set rackID. It is upto the
datanode to tell namenode which rack it belongs to.
Is your datanode doing that explicitly ?
-Lohit
----- Original Message ----
From: Ramya R <[EMAIL PROTECTED]>
To: core-user@hadoop.apache.org
Sent: Tuesday, November 25, 2008 10:36:46 PM
Subject: How to retrieve rack ID of a datanode
Hi all,
I want to retrieve the Rack ID of every datanode. How can I do this?
I tried using getNetworkLocation() in
org.apache.hadoop.hdfs.protocol.DatanodeInfo. I am getting /default-rack
as the output for all datanodes.
Any advice?
Thank in advance
Ramya
--
Yi-Kai Tsai (cuma) <[EMAIL PROTECTED]>, Asia Regional Search Engineering.
