I encountered this while I was starting out too, while moving from a single node cluster to more nodes. I suggest clearing your hadoop-datastore directory, reformatting the HDFS and restarting again. You are very close :) Jeff
> -----Original Message----- > From: Colin Freas [mailto:[EMAIL PROTECTED] > Sent: Friday, March 21, 2008 11:18 AM > To: [email protected] > Subject: Re: Master as DataNode > > ah: > > 2008-03-21 14:06:05,526 ERROR org.apache.hadoop.dfs.DataNode: > java.io.IOException: Incompatible namespaceIDs in > /var/tmp/hadoop-datastore/hadoop/dfs/data: namenode namespaceID = > 2121666262; datanode namespaceID = 2058961420 > > > looks like i'm hitting this "Incompatible namespaceID" bug: > http://issues.apache.org/jira/browse/HADOOP-1212 > > is there a work around for this? > > -colin > > > On Fri, Mar 21, 2008 at 1:50 PM, Jeff Eastman <[EMAIL PROTECTED]> > wrote: > > > Check your logs. That should work out of the box with the configuration > > steps you described. > > > > Jeff > > > > > -----Original Message----- > > > From: Colin Freas [mailto:[EMAIL PROTECTED] > > > Sent: Friday, March 21, 2008 10:40 AM > > > To: [email protected] > > > Subject: Master as DataNode > > > > > > setting up a simple hadoop cluster with two machines, i've gotten to > the > > > point where the two machines can see each other, things seem fine, but > > i'm > > > trying to set up the master as both a master and a slave, just for > > testing > > > purposes. > > > > > > so, i've put the master into the conf/masters file and the conf/slaves > > > file. > > > > > > things seem to work, but there's no DataNode process listed with jps > on > > > the > > > master. i'm wondering if there's a switch i need to flip to tell > hadoop > > > to > > > use the master as a datanode even if it's in the slaves file? > > > > > > thanks again. > > > > > > -colin > > > > > >
