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

1. How does HDFS Federation help HDFS Scale horizontally?

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

2. Which MapReduce daemon instantiates user code, and executes map and reduce tasks on a cluster running MapReduce v1 (MRv1)?

A) DataNode
B) NameNode
C) ResourceManager
D) NodeManager
E) JobTracker
F) TaskTracker
G) ApplicationMaster

3. When setting the HDFS block size, which of the following considerations is the least important?

A) Number of files that will be stored in HDFS.
B) Size of "typical" files that will be stored in HDFS.
C) Number of DataNodes.
D) Amount of memory on the NameNode.
E) Disk capacity of the NameNode.

4. Which command does Hadoop offer to discover missing or corrupt HDFS data?

A) The map-only checksum utility,
B) Dskchk
C) Fsck
D) Du
E) Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.

5. You have a 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 the cluster, which you expect to run a couple of minutes only. Let's assume both jobs are running at the same priority.
How does the FIFO scheduler execute the jobs? (Choose 3)

A) Since job B needs only a few tasks, if might finish before job A completes.
B) Given jobs A and B submitted in that order, all tasks from job A will be scheduled before all tasks from job B.
C) The order of execution of tasks within a job may vary.
D) When a job is submitted, all tasks belonging to that job are scheduled.

Solutions: