Cloudera CCA-470

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Cloudera Certified Administrator for Apache Hadoop CDH4 Upgrade Exam (CCAH) Sample Questions:

1. How does the HDFS architecture provide redundancy?

A) Reliance on RAID at each datanode.
B) Reliance on SAN devices as a DataNode interface.
C) DataNodes make copies of their data blocks, and put them on different local disks.
D) Storing multiple replicas of data blocks on different DataNodes.

2. What additional capability does Ganglia provide to monitor a Hadoop?

A) Ability to monitor the amount of free space on HDFS.
B) Ability to monitor processor utilization.
C) Ability to monitor free task slots.
D) Ability to monitor number of files in HDFS.
E) Ability to monitor NameNode memory usage.

3. Compare the hardware requirements of the NameNode with that of the DataNodes in a Hadoop cluster:

A) The NameNode requires more memory and requires greater disk capacity than the DataNodes.
B) The NameNode requires more memory but less disk capacity.
C) The NameNode requires less memory and fewer number of disk drives than the DataNodes.
D) The NameNode requires more memory and no disk drives.
E) The NameNode and DataNodes should have the same hardware configuration.

4. Which scheduler would you deploy to ensure that your cluster allows short jobs to finish within a reasonable time without starving long-running jobs?

A) FIFO Scheduler
B) Completely Fair Scheduler (CFS)
C) Fair Scheduler
D) Capacity Scheduler

5. Your Hadoop cluster contains nodes in three racks. Choose which scenario results if you leave the dfs.hosts property in the NameNode's configuration file empty (blank)?

A) No new can be added to the cluster until you specify them in the dfs.hosts file.
B) The NameNode will update dfs.hosts property to include machines running the DataNode daemon on the next NameNode reboot or with a dfsadmin -refreshNodes.
C) Any machine running the DataNode daemon can immediately join the cluster.
D) Presented with a blank dfs.hosts property, the NameNode will permit DataNodes specified in mapred.hosts to join the cluster.

Solutions: