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
