Hortonworks Data Platform Certified Developer (HDPCD) Free Practice Test

Question 1

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

A. org.apache.hcatalog.pig.HCatStorer

B. org.apache.hcatalog.pig.HCatOutputFormat

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

D. Pig scripts cannot use an HCatalog table

Correct Answer: A

Question 2

Indentify which best defines a SequenceFile?

A. A SequenceFile contains a binary encoding of an arbitrary number key-value pairs. Each key must be the same type. Each value must be the same type.

B. A SequenceFile contains a binary encoding of an arbitrary number of homogeneous Writable objects

C. A SequenceFile contains a binary encoding of an arbitrary number of WritableComparable objects, in sorted order.

D. A SequenceFile contains a binary encoding of an arbitrary number of heterogeneous Writable objects

Correct Answer: A

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Question 3

Which HDFS command uploads a local file X into an existing HDFS directory Y?

A. hadoop fs -get X Y

B. hadoop fs-put X Y

C. hadoop scp X Y

D. hadoop fs -localPut X Y

Correct Answer: B

Question 4

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. Sqoop

B. Pig

C. Oozie

D. fuse-dfs

E. Hue

F. Hive

G. Flume

Correct Answer: A

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Question 5

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

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

C. Channel these clickstreams inot Hadoop using Hadoop Streaming.

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

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

Correct Answer: B

Question 6

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?

A. Writable

B. OutputFormat

C. InputFormat

D. Partitioner

E. Combiner

F. WritableComparable

Correct Answer: E

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Question 7

In a large MapReduce job with m mappers and n reducers, how many distinct copy operations will there be in the sort/shuffle phase?

A. m

B. mn (i.e., m to the power of n)

C. n

D. mXn (i.e., m multiplied by n)

E. m+n (i.e., m plus n)

Correct Answer: D

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Question 8

You have just executed a MapReduce job.
Where is intermediate data written to after being emitted from the Mapper's map method?

A. Into in-memory buffers on the TaskTracker node running the Mapper that spill over and are written into HDFS.

B. Into in-memory buffers on the TaskTracker node running the Reducer that spill over and are written into HDFS.

C. Into in-memory buffers that spill over to the local file system (outside HDFS) of the TaskTracker node running the Reducer

D. Intermediate data in streamed across the network from Mapper to the Reduce and is never written to disk.

E. Into in-memory buffers that spill over to the local file system of the TaskTracker node running the Mapper.

Correct Answer: E

Explanation: Only visible for TestSimulate members. You can sign-up / login (it's free).

Welcome to TestSimulate

Hortonworks Data Platform Certified Developer (HDPCD) Free Practice Test