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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. What is the rule governing the formatting of the underlying filesystem in the hadoop cluster?

A) They can use different file system
B) they must all be left as formatted raw disk, hadoop format them automatically
C) They must all use the same file system but this does not need to be the same filesystem as the filesystem used by the namenode
D) They must all be left as unformatted, rawdisk;hadoop uses raw unformatted disk for HDFS
E) They must all use the same filesystem as the namenode

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

A) Dskchk
B) Du
C) The map-only checksum utility,
D) Fsck
E) 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.

3. Identify the daemon that performs checkpoint operations of the namespace state in a cluster configured with HDFS High Availability (HA) using Quorum based-storage?

A) NodeManeger
B) BackupNode
C) Standby NameNode
D) Secondary NameNode
E) NameNode
F) JournalNode
G) CheckpointNode

4. The most important consideration for slave nodes in a Hadoop cluster running production jobs that require short turnaround times is:

A) The ratio between the number of processor cores and total storage capacity.
B) The ratio between the number of processor cores and number of disk drives.
C) The ratio between the amount of memory and the number of disk drives.
D) The ratio between the amount of memory and the total storage capacity.
E) The ratio between the number of processor cores and the amount of memory.

5. Your cluster has nodes in seven racks, and you have provided a rack topology script. What is Hadoop's block placement policy, assuming a block replication factor of three?

A) All three of the block are written to nodes on the same rack
B) Because there are seven racks the block is written to a node on each rack
C) One copy of the block is written to a node in each of three racks
D) One copy of the block is written to a node in one rack; two copies are written to two nodes in a different rack

Solutions: