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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. Which three processes does HDFS High Availability (HA) enable on your cluster?

A) Write data to two clusters simultaneously
B) Automatically 'fail over' between NameNodes if one goes down
C) Shut one NameNode down for maintenance without halting the cluster
D) Manually 'fail over' between NameNodes
E) Configure unlimited hot standby NameNode.

2. Choose three reasons why should you run the HDFS balancer periodically?

A) To ensure that there is consistent disk utilization across the DataNodes.
B) To ensure that there is capacity in HDFS tor additional data.
C) To improve data locality for MapReduce tasks.
D) To ensure that all blocks in the cluster are 128MB in size.
E) To help HDFS deliver consistent performance under heavy loads.

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

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

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

5. Your developers request that you enable them to use pig on your hadoop cluster. What do you need to configure and / or install?

A) Install the pig interpreter on the master node which is running the jobtracker
B) Install the pig interpreter on all nodes in the cluster, and the client machines
C) Install the pig jar's on the all slave nodes in the cluster the pig interpreter on the client machines
D) Install the pig interpreter on the client machines only.

Solutions: