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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. What additional capability does Ganglia provide to monitor a Hadoop?

A) Ability to monitor processor utilization.
B) Ability to monitor free task slots.
C) Ability to monitor the amount of free space on HDFS.
D) Ability to monitor number of files in HDFS.
E) Ability to monitor NameNode memory usage.

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

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

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

4. How does the NameNode know DataNodes are available on a cluster running MapReduce v1 (MRv1)

A) The NameNode send a broadcast across the network when it first starts, and DataNodes
respond.
B) DataNodes heartbeat in the master on a regular basis.
C) The NameNode broadcasts a heartbeat on the network on a regular basis, and DataNodes respond.
D) DataNodes listed in the dfs.hosts file. The NameNode uses as the definitive list of available DataNodes.

5. What determines the number of Reduces that run a given MapReduce job on a cluster running MapReduce v1 (MRv1)?

A) It is set and fixed by the cluster administrator in mapred-site.xml. The number set always run for any submitted job.
B) It is set by the JobTracker based on the amount of intermediate data.
C) It is set by the Hadoop framework and is based on the number of InputSplits of the job.
D) It is set by the developer.

Solutions: