The master and slave files, if I remember correctly are used to start the correct daemons on the correct nodes from the master node.
Raj >________________________________ > From: Joey Echeverria <j...@cloudera.com> >To: "common-user@hadoop.apache.org" <common-user@hadoop.apache.org> >Cc: "common-user@hadoop.apache.org" <common-user@hadoop.apache.org> >Sent: Thursday, March 1, 2012 4:57 PM >Subject: Re: Adding nodes > >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. > >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? >>> > > >
