title: Should we change the master and slaves config file for a Hadoop cluster in all nodes?
body: <p>I know that we should put the IP address of the master node in conf/master file and put the IP addresses of all slave nodes in conf/slaves file one per each single line. My question is should we do this only on the master node or we should also change these two files on all slave nodes as well? Furthermore, If I want the master node to be as a DataNode and TaskTracker as well, should I put the IP address of master in slaves file as well?</p>