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

1. Which of the following scenarios makes HDFS unavailable?

A) JobTracker failure
B) NameNode failure
C) Secondary NameNode failure
D) TaskTracker failure
E) DataNode failure

2. Your cluster Mode size is set to 128MB. A client application (client application A) is writing a 500MB file to HDFS. After client application A has written 300MB of data, another client (client application B) attempts to read the file. What is the effect of a second client requesting a file during a write?

A) Client application on B can read the 300MB that has been written so far.
B) Client application B returns an error
C) Client application B must wait until the entire file has been written, and will then read its entire contents.
D) Application B can read 256MB of the file

3. Choose three reasons why should you run the HDFS balancer periodically?

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

4. Choose which best describe a Hadoop cluster's block size storage parameters once you set the HDFS default block size to 64MB?

A) The block size of files in the Cluster will all be multiples of 64M
B) The block size of files in the cluster can be determined as the block is written.
C) The block size of files in the duster will all at least be 64MB.
D) The block size of files in the cluster will all be the exactly 64MB.

5. You have cluster running with the FIFO Scheduler enabled. You submit a large job A to the cluster, which you expect to run for one hour. Then, you submit job B to cluster, which you expect to run a couple of minutes only.
You submit both jobs with the same priority.
Which two best describes how the FIFO Scheduler arbitrates the cluster resources for a job and its tasks?

A) Because there is more then a single job on the cluster, the FIFO Scheduler will enforce a limit on the percentage of resources allocated to a particular job at any given time.
B) The FIFO Schedule will pass an exception back to the client when Job B is submitted, since all slots on the cluster are in use.
C) Given Jobs A and B submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B.
D) The FIFO Scheduler will give, on average, equal share of the cluster resources over the job lifecycle.
E) The order of execution of tasks within a job may vary.
F) Tasks are scheduled in the order of their jobs' submission.

Solutions: