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

1. The failure of which daemon makes HDFS unavailable on a cluster running MapReduce v1 (MRv1)?

A) NameNode
B) Resource Manager
C) Node Manager
D) DataNode
E) Secondary NameNode
F) Application Manager

2. Which MapReduce v2 (MR2/YARN) daemon is a per-machine slave responsible for launching application containers and monitoring application resources usage?

A) NodeManager
B) ApplicationMasterService
C) TaskTracker
D) ApplicationMaster
E) ResourceManager
F) JobTracker

3. What would be a reasonable configuration of disk drives in a Hadoop datanode?

A) Four 1TB disk drives in a RAID configuration
B) 48 1.5 TB disk drives in a RAID configuration
C) 48 1.5TB disk drives in a JBOD configuration
D) Four 1TB disk drives in a JBOD configuration
E) One 1TB disk drive

4. What action occurs automatically on a cluster when a DataNode is marked as dead?

A) The NameNode informs the client which write the blocks that are no longer available; the client then re-writes the blocks to a different DataNode.
B) The replication factor of the files which had blocks stored on the dead DataNode is temporarily reduced, until the dead DataNode is recovered and returned to the cluster.
C) The next time a client submits job that requires blocks from the dead DataNode, the JobTracker receives no heart beats from the DataNode. The JobTracker tells the NameNode that the DataNode is dead, which triggers block re-replication on the cluster.
D) The NameNode forces re-replication of all the blocks which were stored on the dead DataNode.

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

Solutions: