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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
Description Reference: http://www.quora.com/How-to-add-a-node-in-Hadoop-cluster
Update Date and Time 2018-02-23 03:00:22

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
Description Reference: http://bradhedlund.com/2011/09/10/understanding-hadoop-clusters-and-the- network/ (second paragraph on the page)
Update Date and Time 2018-02-23 03:01:14