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Free CCA-500 – Cloudera Certified Administrator for Apache Hadoop (CCAH) Practice Test Question

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Showing 4–6 of 10 questions

Question 4

Choose three reasons why should you run the HDFS balancer periodically? (Choose three)

Select all that apply, then click Submit answer.

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    To ensure that there is capacity in HDFS for additional data
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    To ensure that all blocks in the cluster are 128MB in size
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    To help HDFS deliver consistent performance under heavy loads
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    To ensure that there is consistent disk utilization across the DataNodes
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    To improve data locality MapReduce
Question 5

Which two features does Kerberos security add to a Hadoop cluster? (Choose two)

Select all that apply, then click Submit answer.

  • ○

    User authentication on all remote procedure calls (RPCs)
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    Encryption for data during transfer between the Mappers and Reducers
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    Encryption for data on disk (“at rest”)
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    Authentication for user access to the cluster against a central server
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    Root access to the cluster for users hdfs and mapred but non-root access for clients
Question 6

On a cluster running MapReduce v2 (MRv2) on YARN, a MapReduce job is given a directory of 10 plain text files as its input directory. Each file is made up of 3 HDFS blocks. How many Mappers will run?

Select an option, then click Submit answer.

  • ○

    We cannot say; the number of Mappers is determined by the ResourceManager
  • ○

    We cannot say; the number of Mappers is determined by the developer
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    30
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    3
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    10
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    We cannot say; the number of mappers is determined by the ApplicationMaster