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Cloudera CCA-470 Exam Syllabus Topics:

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

1. Your Hadoop cluster has 12 slave nodes, a block size set to 64MB, and a replication factor of three.
Choose which best describes how the Hadoop Framework distributes block writes into HDFS from a Reducer outputting a 150MB file?

A) The Reducer will generate nine blocks and write them randomly to nodes throughout the cluster.
B) The Reducer will generate twelve blocks and write them to slave nodes nearest the node on which the Reducer runs.
C) Reducers don't write blocks into HDFS
D) The slave node on which the Reducer runs gets the first copy of every block written. Other block replicas will be placed on other nodes.

2. 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 servers as alternate data channel for clients to reach HDFS, should the NameNode become too busy.
B) In this configuration, the Secondary NameNode performs deal-time backups of the NameNode.
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 a checkpoint operation on the files by the NameNode.

3. Identity four pieces of cluster information that are stored on disk on the NameNode?

A) The directory structure of the files in HDFS.
B) An edit log of changes that have been made since the last snapshot of the NameNode.
C) The status of the heartbeats of each DataNode.
D) A catalog of DataNodes and the blocks that are stored on them.
E) An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.
F) File permissions of the files in HDFS.
G) Names of the files in HDFS.

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

5. What would be a reasonable configuration of disk drives in a Hadoop datanode?

A) Four 1TB disk drives in a RAID configuration
B) Four 1TB disk drives in a JBOD configuration
C) 48 1.5TB disk drives in a JBOD configuration
D) 48 1.5 TB disk drives in a RAID configuration
E) One 1TB disk drive

Solutions: