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Only need to practice for 20 to 30 hours

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

1. Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster running MapReduce v1 (MRv1):

A) The NameNode and DataNodes should the same hardware configuration.
B) The NameNode requires less memory and less disk capacity than the DataNodes.
C) The NameNode requires more memory and requires greater disk capacity than the DataNodes.
D) The NameNode requires more memory and no disk drives.
E) The NameNode requires more memory but less disk capacity.

2. You have a cluster running with the Fair in Scheduler enabled. There are currently no jobs running on the cluster, and you submit a job A, so that only job A is running on the cluster. A while later,
you submit job B, Now job A and job B are running on the cluster at the same time.
Which of the following describes how the Fair Scheduler operates? (Choose 2)

A) When job A gets submitted, it consumes all the task slots.
B) When job B gets submitted, it will get assigned tasks, while job A continues to run with fewer tasks.
C) When job B gets submitted, job A has to finish first, before job B can get scheduled.
D) When job A gets submitted, it doesn't consume all the task slots.

3. You have a cluster running with the Fair Scheduler enabled and configured. You submit multiple jobs to cluster. Each job is assigned to a pool. How are jobs scheduled? (Choose 2)

A) Pools get a dynamically-allocated share of the available task slots (subject to additional constraints).
B) Each pool's share of task slots may change throughout the course of job execution.
C) Each pool's share of task slots remains static within the execution of any individual job.
D) Each pool gets 1/N of the total available task slots, where N is the number of jobs running on the cluster.
E) Pools are assigned priorities. Pools with higher priorities are executed before pools with lower priorities.
F) Each pool gets 1/M of the total available task slots, where M is the number of nodes in the cluster

4. Which of the following describe the functions of a scheduling algorithm? (Choose 4)

A) Run jobs at periodic times of the day.
B) Support the implementation of service-level agreements for multiple cluster users.
C) Reduce job latencies in an environment with multiple jobs of different sizes.
D) Reduce the total amount of computation necessary to complete a job.
E) Allow multiple users to share clusters in a predictable, policy-guided manner.
F) Allow short Jobs to complete even when large, long jobs (consuming a lot of resources) are running.

5. You've configured your cluster with HDFS Federation. One NameNode manages the /data namesapace and another Name/Node manages the /reports namespace. How do you configure a client machine to access both the /data and the /reports directories on the cluster?

A) Configure the client to mount the /data namespace. As long as a single namespace is mounted and the client participates in the cluster, HDFS grants access to all files in the cluster to that client.
B) Configure the client to mount both namespaces by specifying the appropriate properties in the core-site.xml
C) You cannot configure a client to access both directories in the current implementation of HDFS Federation.
D) You don't need to configure any parameters on the client machine. Access is controlled by the NameNodes managing the namespace.

Solutions: