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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:

1. What does CDH packaging do on install to facilitate Kerberos security setup?

A) Creates directories for temp, hdfs, and mapreduce with correct permissions.
B) Automatically configure permissions for log files at $MAPPED_LOG_DIR/userlogs
C) Creates users for hdfs and mapreduce to facilitate role assignment.
D) Creates a set of pre-configured Kerberos keytab files and their permissions.
E) Creates and configures you kdc with default cluster values.

2. What is the Secondary NameNode?

A) A process that performs a checkpoint operation on the files produced by the NameNode.
B) A standby NameNode, for high availability.
C) A data channel between the primary name node and the tertiary NameNode.
D) An alternate data channel for clients to reach HDFS, should the NameNode become too busy.
E) A process purely intended to perform backups of the NameNode.

3. How does the NameNode know DataNodes are available on a cluster running MapReduce v1 (MRv1)

A) DataNodes heartbeat in the master on a regular basis.
B) DataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available DataNodes.
C) The NameNode send a broadcast across the network when it first starts, and DataNodes respond.
D) The NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes respond.

4. Cluster Summary
45 files and directories, 12 blocks = 57 total. Heap Size is 15.31 MB / 193.38MB(7%)

Refer to the above screenshot.
You configure the Hadoop cluster with seven DataNodes and the NameNode's web UI displays the details shown in the exhibit.
What does this tells you?

A) The HDFS cluster is in the safe mode.
B) Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.
C) The DataNode JVM on one host is not active.
D) One physical host crashed.

5. Under which of the following scenarios would it be most appropriate to consider using faster (e.g., 10 Gigabit) Ethernet as the network fabric for your Hadoop cluster?

A) When the typical workload generates a large amount of output data, significantly larger than the amount of intermediate data.
B) When the typical workload generates a large amount of intermediate data, on the order of the input data itself.
C) When the typical workload consumes a large amount of input data, relative to the entire Canada of HDFS.
D) When the typical workload consists of processor-intensive tasks.

Solutions: