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

1. What is the recommended disk configuration for slave nodes in your Hadoop cluster with 6 x 2 TB hard drives?

A) RAID 10
B) RAID 1+0
C) RAID 5
D) JBOD

2. What's the relationship between JobTrackers and TaskTrackers?

A) The JobTracker runs on a single master node, but forks a separate instance of itself for every client MapReduce job. A TaskTracker runs on every slave node and is responsible for managing actual map and reduce tasks.
B) Every node in the cluster runs both a JobTracker and a TaskTracker. The JobTrackers manage jobs, and the TaskTrackers are responsible for managing actual map and reduce tasks.
C) The JobTracker runs on a single master node and accepts MapReduce jobs from clients. A TaskTracker runs on every slave node and is responsible for managing actual map and reduce tasks.
D) The TaskTrackers runs on a single master node and accepts MapReduce jobs from clients. A JobTracker runs on every slave node and is responsible for managing map and reduce tasks.

3. Which two updates occur when a client application opens a stream to begin a file write on a cluster running MapReduce v1 (MRv1)?

A) The metadata in RAM on the NameNode is updated.
B) Once the write stream closes on the DataNode, the DataNode immediately initiates a black report to the NameNode.
C) The metadata in the RAM on the NameNode is flushed to disk.
D) The change is written to the NameNode disk.
E) The metadata in RAM on the NameNode is flushed disk.
F) The change is written to the edits file.

4. The failure of which daemon makes HDFS unavailable on a cluster running MapReduce v1 (MRv1)?

A) Application Manager
B) Node Manager
C) DataNode
D) Secondary NameNode
E) Resource Manager
F) NameNode

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

Solutions: