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

2. Which three file actions can execute as you write a file into HDFS?

A) You can rename the file
B) You can update the files contents
C) You can delete the file
D) You can move the file
E) You can index the file

3. Identify four characteristics of a 300MB file that has been written to HDFS with block size of 128MB and all other Hadoop defaults unchanged?

A) All three blocks will be 128MB
B) The file will be split into three blocks when initially written into the cluster
C) The third block will be 64MB
D) The file will consume 1152MB of space in the cluster
E) The third Initial block will be 44 MB
F) Each block will be replicated nine times
G) Each block will be replicated three times
H) Two of the initial blocks will be 128MB

4. 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) ResourceManager
B) JournalNode
C) JobTracker
D) ApplicationMaster
E) NodeManager

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

A) the job will run successfully. Output from the reducers will override the contents of existing directory
B) 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.
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 be placed in a directory called job output -1

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