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

1. You are running a Hadoop cluster with all monitoring facilities properly configured. Which scenario will go undetected?

A) HDFS is almost full.
B) The NameNode goes down.
C) Map or reduce tasks that are stuck in an infinite loop.
D) MapReduce jobs that are causing excessive memory swaps.
E) A DataNode is disconnected from the cluster.

2. Which two features does Kerberos security add to a Hadoop cluster?

A) Root access to the cluster for users hdfs and mapred but non-root acess clients
B) Authentication for user access to the cluster against a central server
C) User authentication on all remote procedure calls (RPcs)
D) Encryption for data on disk ("at rest")
E) Encryption on all remote procedure calls (RPCs)

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

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

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

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

5. On a cluster running MapReduce v1 (MRv1), the value of the mapred.tasktracker.map.tasks.maximum configuration parameter in the mapred-site.xml file should be set to:

A) The maximum number of Map tasks can run simultaneously on an individual node.
B) Half the number of the maximum number of Reduce tasks which can run simultaneously on an individual node.
C) The maximum number of Map tasks which can run on the cluster as a whole.
D) The same value on each slave node.
E) Half the number of the maximum number of Reduce tasks which can run on the cluster as a whole.

Solutions: