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

1. How does the HDFS architecture provide redundancy?

A) Reliance on SAN devices as a DataNode interface.
B) DataNodes make copies of their data blocks, and put them on different local disks.
C) Reliance on RAID at each datanode.
D) Storing multiple replicas of data blocks on different DataNodes.

2. What two processes must you do if you are running a Hadoop cluster with a single NameNode and six DataNodes, and you want to change a configuration parameter so that it affects all six DataNodes.

A) You must restart the NameNode daemon to apply the changes to the cluster
B) You must modify the configuration files on each of the six DataNode machines.
C) You must modify the configuration files on the NameNode only. DataNodes read their configuration from the master nodes.
D) You must restart all six DataNode daemons to apply the changes to the cluster.
E) You don't need to restart any daemon, as they will pick up changes automatically.
F) You must modify the configuration files on only one of the DataNode machine

3. Identify four characteristics of a 300MB file that has been written to HDFS with block size of 128MB and all other Hadoop defaults unchanged?

A) The file will be split into three blocks when initially written into the cluster
B) All three blocks will be 128MB
C) Two of the initial blocks will be 128MB
D) Each block will be replicated nine times
E) The file will consume 1152MB of space in the cluster
F) Each block will be replicated three times
G) The third Initial block will be 44 MB
H) The third block will be 64MB

4. What information is stored on disk on the NameNode? (Choose 4)

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

5. How must you format the underlying filesystem of your Hadoop cluster's slave nodes running on Linux?

A) They must be formatted as HDFS
B) They must be formatted as either ext3 or ext4
C) They must not be formatted - - HDFS will format the filesystem automatically
D) They may be formatted in nay Linux filesystem

Solutions: