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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. How does HDFS Federation help HDFS Scale horizontally?

A) HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.
B) HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.
C) HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.
D) HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.

2. You have cluster running with the FIFO Scheduler enabled. You submit a large job A to the cluster, which you expect to run for one hour. Then, you submit job B to cluster, which you expect to run a couple of minutes only.
You submit both jobs with the same priority.
Which two best describes how the FIFO Scheduler arbitrates the cluster resources for a job and its tasks?

A) Given Jobs A and B submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B.
B) Tasks are scheduled in the order of their jobs' submission.
C) The FIFO Schedule will pass an exception back to the client when Job B is submitted, since all slots on the cluster are in use.
D) The FIFO Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.
E) Because there is more then a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time.
F) The order of execution of tasks within a job may vary.

3. 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 performs a checkpoint operation on the files by the NameNode.
D) In this configuration, the Secondary NameNode is standby NameNode, ready to failover and provide high availability.

4. On a cluster running MapReduce v1 (MRv1), a MapReduce job is given a directory of 10 plain text as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?

A) We cannot say; the number of Mappers is determined by the developer
B) 1
C) 10
D) 30

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

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

Solutions: