CCD-410 Exam Training Practice Tests (Cloudera Certified Developer for Apache Hadoop (CCDH))]

Question 1

MapReduce v2 (MRv2/YARN) splits which major functions of the JobTracker into separate daemons? Select two.

A. Job scheduling/monitoring B. Job coordination between the ResourceManager and NodeManager C. MapReduce metric reporting D. Managing tasks E. Launching tasks F. Heath states checks (heartbeats) G. Managing file system metadata H. Resource management

Correct Answer: A,H

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Question 2

In a MapReduce job with 500 map tasks, how many map task attempts will there be?

A. It depends on the number of reduces in the job. B. At least 500. C. Exactly 500. D. At most 500. E. Between 500 and 1000.

Correct Answer: B

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Question 3

You need to create a job that does frequency analysis on input data. You will do this by writing a Mapper that uses TextInputFormat and splits each value (a line of text from an input file) into individual characters. For each one of these characters, you will emit the character as a key and an InputWritable as the value. As this will produce proportionally more intermediate data than input data, which two resources should you expect to be bottlenecks?

A. Processor and network I/O B. Processor and RAM C. Processor and disk I/O D. Disk I/O and network I/O

Correct Answer: D

Question 4

You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys, IntWritable values. Which interface should your class implement?

A. Reducer <Text, Text, IntWritable, IntWritable> B. Combiner <Text, IntWritable, Text, IntWritable> C. Combiner <Text, Text, IntWritable, IntWritable> D. Reducer <Text, IntWritable, Text, IntWritable> E. Mapper <Text, IntWritable, Text, IntWritable>

Correct Answer: D

Question 5

You use the hadoop fs -put command to write a 300 MB file using and HDFS block size of 64 MB. Just after this command has finished writing 200 MB of this file, what would another user see when trying to access this life?

A. They would see the current of the file through the last completed block. B. They would see Hadoop throw an ConcurrentFileAccessException when they try to access this file. C. They would see the current state of the file, up to the last bit written by the command. D. They would see no content until the whole file written and closed.

Correct Answer: A

Question 6

Workflows expressed in Oozie can contain:

A. Iterntive repetition of MapReduce jobs until a desired answer or state is reached. B. Sequences of MapReduce and Pig. These sequences can be combined with other actions including forks, decision points, and path joins. C. Sequences of MapReduce and Pig jobs. These are limited to linear sequences of actions with exception handlers but no forks. D. Sequences of MapReduce job only; on Pig on Hive tasks or jobs. These MapReduce sequences can be combined with forks and path joins.

Correct Answer: B

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Cloudera Certified Developer for Apache Hadoop (CCDH) - CCD-410 Exam Practice Test