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MapReduce >> mail # user >> cluster set-up / a few quick questions

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cluster set-up / a few quick questions

- do you put Master's node <hostname> under fs.default.name in core-site.xml on the slave machines or slaves' hostnames?
- do you need to run "sudo -u hdfs hadoop namenode -format" and create /tmp /var folders on the HDFS of the slave machines that will be running only DN and TT or not? Do you still need to create hadoop/dfs/name folder on the slaves?

In hdfs-site.xml for dfs.name.dir & dfs.data.dir properties  we specify  /hadoop/dfs/name /hadoop/dfs/data  being  local linux NFS directories by running command "mkdir -p /hadoop/dfs/data"
but mapred.system.dir  property is to point to HDFS and not NFS  since we are running "sudo -u hdfs hadoop fs -mkdir /tmp/mapred/system"??
If so and since it is exactly the same format  /far/boo/baz how does hadoop know which directory is local on NFS or HDFS?
Would you please kindly reconfirm.

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