The DataNode can be told which rack it lies in. This is documented in http://issues.apache.org/jira/browse/HADOOP-692
thanks, dhruba -----Original Message----- From: Torsten Curdt [mailto:[EMAIL PROTECTED] Sent: Thursday, September 06, 2007 3:35 PM To: [email protected] Subject: Re: Anybody using HDFS as a long term storage solution? Is there a jira issue for it already? Whom could I bug (bribe?) to document the rack-awareness feature? :) cheers -- Torsten On 07.09.2007, at 00:26, Michael Bieniosek wrote: > Well, there is an (undocumented?) way to get rack-awareness in the > Datanode, > so you could co-opt this to represent datacenter-awareness. I > don't think > there is such a rack-awareness ability for the DFSClient or > TaskTracker > though. > > -Michael > > On 9/6/07 3:10 PM, "Torsten Curdt" <[EMAIL PROTECTED]> wrote: > >>> Another big question: Has anybody tried using HADOOP / HDFS across >>> multiple geographic sites? >> >> That's actually a biggy I would be very much interested in, too >> >> cheers >> -- >> Torsten >
