Cloudera Certified Administrator for Apache Hadoop (CCAH) (CCA-500) Free Practice Test

Question 1

In CDH4 and later, which file contains a serialized form of all the directory and files inodes in the filesystem, giving the
NameNode a persistent checkpoint of the filesystem metadata?

A. Fsimage_N (where N reflects transactions up to transaction ID N)

B. fstime

C. VERSION

D. Edits_N-M (where N-M transactions between transaction ID N and transaction ID N)

Correct Answer: A

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Question 2

Identify two features/issues that YARN is designated to address:

A. Resource pressure on the JobTracker

B. Ability to run framework other than MapReduce, such as MPI

C. HDFS latency

D. Single point of failure in the NameNode

E. Reduce complexity of the MapReduce APIs

F. Standardize on a single MapReduce API

Correct Answer: A,D

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Question 3

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

A. The FIFO Scheduler will give, on average, and equal share of the cluster resources over the job lifecycle

B. The FIFO Scheduler will pass an exception back to the client when Job B is submitted, since all slots on the cluster
are use

C. The order of execution of job may vary

D. Because there is a more than 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

E. Given job A and submitted in that order, all tasks from job A are guaranteed to finish before all tasks from job B

F. Tasks are scheduled on the order of their job submission

Correct Answer: A,D

Question 4

On a cluster running CDH 5.0 or above, you use the hadoop fs -put command to write a 300MB file into a previously
empty directory using an HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file,
what would another use see when they look in directory?

A. They will see the file with its original name. If they attempt to view the file, they will get a
ConcurrentFileAccessException until the entire file write is completed on the cluster

B. They will see the file with a ._COPYING_ extension on its name. If they view the file, they will see contents of the
file up to the last completed block (as each 64MB block is written, that block becomes available)

C. The directory will appear to be empty until the entire file write is completed on the cluster

D. They will see the file with a ._COPYING_ extension on its name. If they attempt to view the file, they will get a
ConcurrentFileAccessException until the entire file write is completed on the cluster

Correct Answer: A

Question 5

You suspect that your NameNode is incorrectly configured, and is swapping memory to disk. Which Linux commands
help you to identify whether swapping is occurring?

A. jps

B. vmstat

C. memcat

D. free

E. top

F. swapinfo

G. df

Correct Answer: B,D,E

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Question 6

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 a Hadoop cluster with seven DataNodes and on of your monitoring UIs displays the details shown in the
exhibit.
What does the this tell you?

A. Your cluster has lost all HDFS data which had bocks stored on the dead DatNode

B. Because your under-replicated blocks count matches the Live Nodes, one node is dead, and your DFS Used %
equals 0%, you can't be certain that your cluster has all the data you've written it.

C. The DataNode JVM on one host is not active

D. The HDFS cluster is in safe mode

Correct Answer: B

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Cloudera Certified Administrator for Apache Hadoop (CCAH) (CCA-500) Free Practice Test