On Thu, Mar 1, 2012 at 4:57 PM, Joey Echeverria <j...@cloudera.com> wrote:
> Not quite. Datanodes get the namenode host from fs.defalt.name in > core-site.xml. Task trackers find the job tracker from the > mapred.job.tracker setting in mapred-site.xml. > I actually meant to ask how does namenode/jobtracker know there is a new node in the cluster. Is it initiated by namenode when slave file is edited? Or is it initiated by tasktracker when tasktracker is started? > > Sent from my iPhone > > On Mar 1, 2012, at 18:49, Mohit Anchlia <mohitanch...@gmail.com> wrote: > > > On Thu, Mar 1, 2012 at 4:46 PM, Joey Echeverria <j...@cloudera.com> > wrote: > > > >> You only have to refresh nodes if you're making use of an allows file. > >> > >> Thanks does it mean that when tasktracker/datanode starts up it > > communicates with namenode using master file? > > > > Sent from my iPhone > >> > >> On Mar 1, 2012, at 18:29, Mohit Anchlia <mohitanch...@gmail.com> wrote: > >> > >>> Is this the right procedure to add nodes? I took some from hadoop wiki > >> FAQ: > >>> > >>> http://wiki.apache.org/hadoop/FAQ > >>> > >>> 1. Update conf/slave > >>> 2. on the slave nodes start datanode and tasktracker > >>> 3. hadoop balancer > >>> > >>> Do I also need to run dfsadmin -refreshnodes? > >> >
