Cloudera Certified Developer for Apache Hadoop (CCDH)

Here you have the best Cloudera CCD-410 practice exam questions

You have 60 total questions to study from
Each page has 5 questions, making a total of 12 pages
You can navigate through the pages using the buttons at the bottom
This questions were last updated on November 19, 2025
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Question 1 of 60

How are keys and values presented and passed to the reducers during a standard sort and shuffle phase of MapReduce?

Keys are presented to reducer in sorted order; values for a given key are not sorted.

Keys are presented to reducer in sorted order; values for a given key are sorted in ascending order.

Keys are presented to a reducer in random order; values for a given key are not sorted.

Keys are presented to a reducer in random order; values for a given key are sorted in ascending order.

Correct Answer: A

Question 2 of 60

Assuming default settings, which best describes the order of data provided to a reducer's reduce method:

The keys given to a reducer aren't in a predictable order, but the values associated with those keys always are.

Both the keys and values passed to a reducer always appear in sorted order.

Neither keys nor values are in any predictable order.

The keys given to a reducer are in sorted order but the values associated with each key are in no predictable order

Correct Answer: D

Question 3 of 60

You wrote a map function that throws a runtime exception when it encounters a control character in input data. The input supplied to your mapper contains twelve such characters totals, spread across five file splits. The first four file splits each have two control characters and the last split has four control characters.
Indentify the number of failed task attempts you can expect when you run the job with mapred.max.map.attempts set to 4:

You will have forty-eight failed task attempts

You will have seventeen failed task attempts

You will have five failed task attempts

You will have twelve failed task attempts

You will have twenty failed task attempts

Correct Answer: E

There will be four failed task attempts for each of the five file splits.
Note:
Exam CCD-410: Question 3 - Image 1

Question 4 of 60

You want to populate an associative array in order to perform a map-side join. You've decided to put this information in a text file, place that file into the
DistributedCache and read it in your Mapper before any records are processed.
Indentify which method in the Mapper you should use to implement code for reading the file and populating the associative array?

combine

map

init

configure

Correct Answer: D

Question 5 of 60

You've written a MapReduce job that will process 500 million input records and generated 500 million key-value pairs. The data is not uniformly distributed. Your
MapReduce job will create a significant amount of intermediate data that it needs to transfer between mappers and reduces which is a potential bottleneck. A custom implementation of which interface is most likely to reduce the amount of intermediate data transferred across the network?

Partitioner

OutputFormat

WritableComparable

Writable

InputFormat

Combiner

Correct Answer: F