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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Using hadoop's default settings, how much data will be able to store on your hadoop cluster if it is has 12 nodes with 4TB raw diskspace per node allocated to HDFS storage?

A) Approximately 12TB
B) Approximately 48TB
C) Approximately 3TB
D) Approximately 16TB

2. You are running two Hadoop clusters(cluster1 and cluster2), they run identical versions of hadoop.
You want to copy the data inside /home/foo/cluster1 to cluster2 into the directory /home/bar/
What is the correct distcp syntax to copy one directory tree from one cluster to the other cluster?

A) $ distCp cluster1:/home/foo cluster2:/home/bar/
B) $ distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/
C) $ Hadoop distCp cluster1:/home/foo cluster2:/home/bar/
D) $ hadoop distCp hdfs://cluster1/home/foo hdfs://cluster2/home/bar/

3. What is the recommended disk configuration for slave nodes in your Hadoop cluster with 6 x 2 TB hard drives?

A) RAID 5
B) JBOD
C) RAID 1+0
D) RAID 10

4. Your cluster Mapreduce V1 (MVR1). What determines where blocks are return into HDFS client application?

A) The clients sends the data to the name node, which then writes those blocks to the data nodes
B) The client queries the name node, which returns information on which data nodes to use. Then client writes to those data nodes.
C) The client immediately to data nodes based on the clusters rack locality settings
D) the client writes immediately to data nodes at random

5. Identify the function performed by the Secondary NameNode daemon on a cluster configured to run with a single NameNode.

A) In this configuration, the Secondary NameNode performs a checkpoint operation on the files by the NameNode.
B) In this configuration, the Secondary NameNode servers as alternate data channel for clients to reach HDFS, should the NameNode become too busy.
C) In this configuration, the Secondary NameNode is standby NameNode, ready to failover and provide high availability.
D) In this configuration, the Secondary NameNode performs deal-time backups of the NameNode.

Solutions: