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Cloudera Certified Administrator for Apache Hadoop CDH4 Sample Questions:

1. How many mappers required for a map reduce, job determine on a cluster running map reduce V1 (MRv1)?

A) The number of mappers is calculated by namenode based on the number of HDFS blocks in the files
B) The number mappers is equal to no of input splits calculated by client submitting
C) the jobtracker chooses the number based on no of available nodes
D) the developer specifies the number in the job configuration

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

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

3. You are a Hadoop cluster with a NameNode on host mynamenode. What are two ways to determine available HDFS space in your cluster?

A) Run hadoop dfsadmin -report and locate the DFS Remaining value.
B) Run hadoop fs -du/and locate the DFS Remaining value.
C) Connect to http://mynamemode:50070/ and locate the DFS Remaining value.
D) Run hadoop dfsadmin -SpaceQuota and subtract HDFS Used from Configured Capacity.

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

5. 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) Completely Fair Scheduler (CFS)
B) Capacity Scheduler
C) Fair Scheduler
D) FIFO Scheduler

Solutions: