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

1. Your cluster implements HDFS High Availability (HA). You two NameNodes are named nn01 and nn02. What occurs when you execute the command:
Hdfs haadmin -failover nn01 nn02

A) nn02 becomes the standby NameNode and nn02 becomes the active NameNode
B) Nn01 is fenced, and nn02 becomes the active NameNode
C) Nn01 becomes the standby NameNode and nn02 becomes the active NameNode
D) Nn01 is fenced, and nn01 becomes the active NameNode

2. The most important consideration for slave nodes in a Hadoop cluster running production jobs that require short turnaround times is:

A) The ratio between the amount of memory and the number of disk drives.
B) The ratio between the number of processor cores and total storage capacity.
C) The ratio between the number of processor cores and the amount of memory.
D) The ratio between the amount of memory and the total storage capacity.
E) The ratio between the number of processor cores and number of disk drives.

3. For a MapReduce job, what's the relationship between tasks and task attempts?

A) There are always exactly as many task attempts as there are tasks.
B) There are always at most as many task attempts as there are tasks.
C) There are always at least as many task attempts as there are tasks.

4. 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 change is written to the NameNode disk.
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 edits file.
E) The metadata in RAM on the NameNode is updated.
F) The metadata in RAM on the NameNode is flushed disk.

5. Which MapReduce v2 (MR2/YARN) daemon is a per-machine slave responsible for launching application containers and monitoring application resources usage?

A) ApplicationMasterService
B) NodeManager
C) ApplicationMaster
D) TaskTracker
E) JobTracker
F) ResourceManager

Solutions: