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Question ID 20583	What do you need to do when adding new slave nodes to a cluster?
Option A	Halt and resubmit any running MapReduce jobs to guarantee correctness.
Option B	Restart the NameNode daemon.
Option C	Add a new entry to /etc/slavenodes on the NameNode host.
Option D	Increase the value of dfs.number.of.nodes in hdfs-site.xml.
Option E	add the new node's DNS name to the conf/slaves file on the master node.
Correct Answer	E

Explanation Reference: http://www.quora.com/How-to-add-a-node-in-Hadoop-cluster

Question ID 20584	What is the standard configuration of slave nodes in a Hadoop cluster?
Option A	Each slave node either runs a TaskTracker or a DataNode daemon, but not both.
Option B	Each slave node runs a JobTracker and a DataNode daemon.
Option C	Each slave node runs a TaskTracker and a DataNode daemon.
Option D	Each slave node runs a DataNode daemon, but only a fraction of the slave nodes run TaskTrackers.
Option E	Each slave node runs a TaskTracker, but only a fraction of the slave nodes run DataNode daemons.
Correct Answer	C

Explanation Reference: http://bradhedlund.com/2011/09/10/understanding-hadoop-clusters-and-the- network/ (second paragraph on the page)

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