@amit: if the DN is getting the IP from dhcp then the ip address might change after a reboot. Dynamic ip's in the cluster are not a good choice. IMO
Best Regards, Anil On Apr 30, 2012, at 8:22 PM, Amith D K <amit...@huawei.com> wrote: > Hi sumadhur, > > As u mentioned configureg the NN and JT ip would be enough. > > I am not able to understand how on DN restart its IP get changed? > > ________________________________________ > From: sumadhur [sumadhur_i...@yahoo.com] > Sent: Tuesday, May 01, 2012 10:58 AM > To: common-user@hadoop.apache.org > Subject: adding or restarting a data node in a hadoop cluster > > I am on hadoop 0.20. > > To add a data node to a cluster, if we do not use the include/exclude/slaves > files, do we need to do anything other than configuring the hdfs-site.xml to > point to name node and the mapred-site.xml to point to job tracker? > > For example, should the job tracker and name node be restarted always? > > On a related note, if we restart a data node(that has some blocks on it) and > the data node now has new IP address, Should we restart namenode/job tracker > for hdfs and map-reduce to function correctly? > Would the blocks on the restarted data node be detected or would hdfs think > that these blocks were lost and start replicating them? > > Thanks, > Sumadhur
