Certified Data Professional (CDP)

Question 1

When may the reduce method of a certain Reducer be invoked for the first time?

As soon as a Mapper has emitted at least one record As soon as at least one Mapper has finished processing records It depends on the InputFormat used for the job Not until all the Mappers have finished processing records

Correct Answer:

Not until all the Mappers have finished processing records

Question 2

How can a client access a file on HDFS?

The client asks NameNode where the block is located (s). The NameNode gives the client the block location(s) back. Data is immediately read by the client from the DataNode (s) The client simultaneously requests every DataNode. The client receives a response from the DataNode with the requested data. Data is immediately read by the client from the DataNode. For the block location, the Client contacts the NameNode (s). The NameNode contacts the DataNode that contains the desired data block. Data is exchanged from the DataNode to the NameNode to the Client from the NameNode to the Client. For the block location, the client contacts the NameNode (s). The NameNode then requests block locations from the DataNodes. The NameNode leads the client to the DataNode, holding the requested data block when the DataNodes react to it (s). Data is then read directly from the DataNode by the client.

Correct Answer:

For the block location, the client contacts the NameNode (s). The NameNode then requests block locations from the DataNodes. The NameNode leads the client to the DataNode, holding the requested data block when the DataNodes react to it (s). Data is then read directly from the DataNode by the client.

Question 3

Which tool enables you to use any executable script as the Mapper or Reducer to generate and run MapReduce jobs?

Oozie Flume Hadoop Streaming Sqoop

Correct Answer:

Hadoop Streaming

Question 4

During a typical sort and shuffle phase of MapReduce, how are keys and data presented and delivered to Reducers?

Keys are presented to a Reducer in sorted order; values for a given key are not sorted Keys are presented to a Reducer in sorted order; values for a given key are sorted in ascending orde Keys are presented to a Reducer in random 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

Correct Answer:

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

Question 5

Which best reflects the sequence in which data is supplied to a Reducer's reduce function, assuming default settings?

Neither keys nor values are in any predictable order The keys given to a Reducer aren't in a predictable order, but the values associated with those keys always are The keys given to a Reducer are in sorted order, but the values associated with each key are in no predictable order Both the keys and values passed to a Reducer always appear in sorted order

Correct Answer:

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

Question 1

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Prepare with the Certified Data Professional (CDP) practice quiz. This question bank includes 100 questions covering data, database, context, quality, and integration. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Certified Data Professional (CDP)

This practice set contains 100 questions from the matching question bank and focuses on data, database, context, quality, and integration. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

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Certified Data Professional (CDP)

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