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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

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

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

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

3. You configure Hadoop cluster with both MapReduce frameworks, MapReduce v1 (MRv1) and MapReduce v2 (MRv2/YARN). Which two MapReduce (computational) daemons do you need to configure to run on your master nodes?

A) ApplicationMaster
B) ResourceManager
C) JobTracker
D) NodeManager
E) JournalNode

4. What happens when a map task crashes while running a mapreduce job?

A) The job immediately fails
B) The jobtracker attempts to re-run the task on the same node
C) the jobtracket attempts to re-run the task on a different node
D) The tasktracker closes the JVM instance and restarts

5. Your cluster has 9 slave nodes. The cluster block size is set to 128 MB and it's replication factor set to three.
How will the hadoop framework distribute block writes from a reducer into HDFS from a reducer outputting a 300MB file?

A) The 9 blocks will be return to 3 nodes, such that each of the three get's one copy of each block
B) All 9 nodes will each receive exactly one block
C) The node on which the reducer is running will receive one copy of the each block. The other replicas will be placed on other nodes in the cluster
D) Reducer don't write blocks into HDFS
E) The 9 blocks will be return randomly to the nodes; some may receive multiple blocks some may receive none

Solutions: