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

1. What information is stored on disk on the NameNode? (Choose 4)

A) File permissions of the files in HDFS.
B) A catalog of DataNodes and the blocks that are stored on them.
C) An edit log of changes that have been made since the last backup of the NameNode.
D) Names of the files in HDFS.
E) The status of the heartbeats of each DataNode.
F) An edit log of changes that have been made since the last snapshot compaction by the Secondary NameNode.
G) The directory structure of the files in HDFS.

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

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

3. Cluster Summary
45 files and directories, 12 blocks = 57 total. Heap Size is 15.31 MB / 193.38MB(7%)

Refer to the above screenshot.
You configure the Hadoop cluster with seven DataNodes and the NameNode's web UI displays the details shown in the exhibit.
What does this tells you?

A) The DataNode JVM on one host is not active.
B) Your cluster has lost all HDFS data which had blocks stored on the dead DataNode.
C) The HDFS cluster is in the safe mode.
D) One physical host crashed.

4. Which command does Hadoop offer to discover missing or corrupt HDFS data?

A) Du
B) Fsck
C) The map-only checksum utility,
D) Hadoop does not provide any tools to discover missing or corrupt data; there is no need because three replicas are kept for each data block.
E) Dskchk

5. How does HDFS Federation help HDFS Scale horizontally?

A) HDFS Federation reduces the load on any single NameNode by using the multiple, independent NameNode to manage individual pars of the filesystem namespace.
B) HDFS Federation allows the Standby NameNode to automatically resume the services of an active NameNode.
C) HDFS Federation improves the resiliency of HDFS in the face of network issues by removing the NameNode as a single-point-of-failure.
D) HDFS Federation provides cross-data center (non-local) support for HDFS, allowing a cluster administrator to split the Block Storage outside the local cluster.

Solutions: