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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Your cluster has nodes in seven racks, and you have provided a rack topology script. What is Hadoop's block placement policy, assuming a block replication factor of three?

A) Because there are seven racks the block is written to a node on each rack
B) All three of the block are written to nodes on the same rack
C) One copy of the block is written to a node in each of three racks
D) One copy of the block is written to a node in one rack; two copies are written to two nodes in a different rack

2. Your cluster implements hdfs high availability (HA) your two namenodes are named hadoop01 and hadoop02. What occurs when you execute the command:
Sudo -u hdfs haadmin -failover hadoop01 hadoop02

A) Hadoop02 becomes the standby namenode and hadoop01 becomes the active namenode
B) Hadoop01 is fenced, and hadoop02 becomes the active namenode
C) Hadoop02 is fenced, and hadoop01 becomes active namenode
D) Hadoop01 becomes inactive and hadoop02 becomes the active namenode

3. What is the smallest number of slave nodes you would need to configure in your hadoop cluster to
store 100TB of data, using Hadoop default replication values, on nodes with 10TB of RAW disk space per node?

A) 10
B) 100
C) 40
D) 25
E) 75

4. What does each block of a file contain where it is return into HDFS?

A) Each block has a header and footer containing metadata
B) Each block contains only data from the file
C) Each block as a header containing metadata
D) Each block writes a separate meta file containing information on the file name of which the block is a part

5. Where does a MapReduce job store the intermediate data output from Mappers?

A) On the underlying filesystem of the local disk of the machine on which the Mapper ran.
B) On the underlying filesystem of the local disk machine on which the JobTracker ran.
C) In HDFS, in temporary directory defined mapred.tmp.dir.
D) Stores on the underlying filesystem of the local disk of the machine on which the Reducer.
E) In HDFS, in the job's output directory.

Solutions: