I take that back. I forgot about the changes in new version of HDFS. If you are testing this take a look at TestReplication.java Lohit
----- Original Message ---- From: Ramya R <[EMAIL PROTECTED]> To: core-user@hadoop.apache.org Cc: [EMAIL PROTECTED] Sent: Tuesday, November 25, 2008 11:15:28 PM Subject: RE: How to retrieve rack ID of a datanode 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
