Cloudera CCD-410 Actual Free Exam Questions & Community Discussion

Exam Code/Number: CCD-410
Exam Name/Title: Cloudera Certified Developer for Apache Hadoop (CCDH)
Certification Provider: Cloudera
Corresponding Certification: CCDH

Exam Questions: 60
Updated On: May 29, 2026

Question #25

Your client application submits a MapReduce job to your Hadoop cluster. Identify the Hadoop daemon on which the Hadoop framework will look for an available slot schedule a MapReduce operation.

A. NameNode

B. JobTracker

C. Secondary NameNode

D. DataNode

E. TaskTracker

Discussion 0

Correct Answer: B Vote an answer

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Question #26

Identify the tool best suited to import a portion of a relational database every day as files into HDFS, and generate Java classes to interact with that imported data?

A. fuse-dfs

B. Sqoop

C. Hive

D. Pig

E. Hue

F. Flume

G. Oozie

Discussion 0

Correct Answer: B Vote an answer

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Question #27

You need to move a file titled "weblogs" into HDFS. When you try to copy the file, you can't. You know you have ample space on your DataNodes. Which action should you take to relieve this situation and store more files in HDFS?

A. Decrease the block size on all current files in HDFS.

B. Increase the amount of memory for the NameNode.

C. Increase the number of disks (or size) for the NameNode.

D. Decrease the block size on your remaining files.

E. Increase the block size on your remaining files.

F. Increase the block size on all current files in HDFS.

Discussion 0

Correct Answer: D Vote an answer

Question #28

In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling the next () method return?

A. It returns a reference to a Writable object from an object pool.

B. It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.

C. It returns a reference to the same Writable object each time, but populated with different data.

D. It returns a reference to a different Writable object time.

E. It returns a reference to the same Writable object if the next value is the same as the previous value, or a new Writable object otherwise.

Discussion 0

Correct Answer: C Vote an answer

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Question #29

You want to count the number of occurrences for each unique word in the supplied input data. You've decided to implement this by having your mapper tokenize each word and emit a literal value 1, and then have your reducer increment a counter for each literal 1 it receives. After successful implementing this, it occurs to you that you could optimize this by specifying a combiner. Will you be able to reuse your existing Reduces as your combiner in this case and why or why not?

A. No, because the Reducer and Combiner are separate interfaces.

B. No, because the sum operation in the reducer is incompatible with the operation of a Combiner.

C. No, because the Combiner is incompatible with a mapper which doesn't use the same data type for both the key and value.

D. Yes, because Java is a polymorphic object-oriented language and thus reducer code can be reused as a combiner.

E. Yes, because the sum operation is both associative and commutative and the input and output types to the reduce method match.

Discussion 0

Correct Answer: E Vote an answer

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Question #30

When is the earliest point at which the reduce method of a given Reducer can be called?

A. Not until all mappers have finished processing all records.

B. As soon as at least one mapper has finished processing its input split.

C. It depends on the InputFormat used for the job.

D. As soon as a mapper has emitted at least one record.

Discussion 0

Correct Answer: A Vote an answer

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