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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 NameNode memory usage.
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 processor utilization.

2. What occurs when you run a hadoop job specifying output directory for job output which already exists in HDFS?

A) an error will occur after the mappers have completed but before any reducers begin to run because the output path must not exist during the shuffle and sort.
B) the job will run successfully output from the reducers will be placed in a directory called job output -1
C) An error will occur immediately because the output directory must not already exist.
D) the job will run successfully. Output from the reducers will override the contents of existing directory

3. Identify which two daemons typically run each slave node in a Hadoop cluster running MapReduce v1 (MRv1)

A) NameNode
B) JobTracker
C) TaskTracker
D) NodeManager
E) DataNode
F) Secondary NameNode

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

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

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) Reducer don't write blocks into HDFS
B) The 9 blocks will be return to 3 nodes, such that each of the three get's one copy of each 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) The 9 blocks will be return randomly to the nodes; some may receive multiple blocks some may receive none
E) All 9 nodes will each receive exactly one block

Solutions: