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? >>
