Hortonworks Apache-Hadoop-Developer Actual Free Exam Questions & Community Discussion

Exam Code/Number: Apache-Hadoop-Developer
Exam Name/Title: Hadoop 2.0 Certification exam for Pig and Hive Developer
Certification Provider: Hortonworks
Corresponding Certification: HCAHD

Exam Questions: 110
Updated On: Jun 20, 2026

Question #1

You have a directory named jobdata in HDFS that contains four files: _first.txt, second.txt, .third.txt and #data.txt. How many files will be processed by the FileInputFormat.setInputPaths () command when it's given a path object representing this directory?

A. Four, all files will be processed

B. None, the directory cannot be named jobdata

C. Three, the pound sign is an invalid character for HDFS file names

D. One, no special characters can prefix the name of an input file

E. Two, file names with a leading period or underscore are ignored

Discussion 0

Correct Answer: E Vote an answer

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Question #2

Which one of the following statements is true regarding a MapReduce job?

A. The job's Partitioner shuffles and sorts all (key.value) pairs and sends the output to all reducers

B. The default Hash Partitioner sends key value pairs with the same key to the same Reducer

C. The reduce method is invoked once for each unique value

D. The Mapper must sort its output of (key.value) pairs in descending order based on value

Discussion 0

Correct Answer: A Vote an answer

Question #3

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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Question #4

You want to understand more about how users browse your public website, such as which pages they visit prior to placing an order. You have a farm of 200 web servers hosting your website. How will you gather this data for your analysis?

A. Write a MapReduce job, with the web servers for mappers, and the Hadoop cluster nodes for reduces.

B. Ingest the server web logs into HDFS using Flume.

C. Import all users' clicks from your OLTP databases into Hadoop, using Sqoop.

D. Channel these clickstreams inot Hadoop using Hadoop Streaming.

E. Sample the weblogs from the web servers, copying them into Hadoop using curl.

Discussion 0

Correct Answer: B Vote an answer

Question #5

You want to run Hadoop jobs on your development workstation for testing before you submit them to your production cluster. Which mode of operation in Hadoop allows you to most closely simulate a production cluster while using a single machine?

A. Run the DataNode, TaskTracker, NameNode and JobTracker daemons on a single machine.

B. Run simldooop, the Apache open-source software for simulating Hadoop clusters.

C. Run the hadoop command with the -jt local and the -fs file:///options.

D. Run all the nodes in your production cluster as virtual machines on your development workstation.

Discussion 0

Correct Answer: A Vote an answer

Question #6

Which one of the following classes would a Pig command use to store data in a table defined in HCatalog?

A. Pig scripts cannot use an HCatalog table

B. org.apache.hcatalog.pig.HCatOutputFormat

C. org.apache.hcatalog.pig.HCatStorer

D. No special class is needed for a Pig script to store data in an HCatalog table

Discussion 0

Correct Answer: C Vote an answer

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