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Question ID 12483

You have user profile records in your OLPT database, that you want to join with web logs
you have already ingested into the Hadoop file system. How will you obtain these user
records?

Option A

HDFS command

Option B

Pig LOAD command

Option C

Sqoop import

Option D

Hive LOAD DATA command

Option E

Ingest with Flume agents

Option F

Ingest with Hadoop Streaming

Correct Answer C
Explanation Reference: Hadoop and Pig for Large-Scale Web Log Analysis


Question ID 12484

In a MapReduce job, the reducer receives all values associated with same key. Which
statement best describes the ordering of these values?

Option A

The values are in sorted order.

Option B

The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce job.

Option C

The values are arbitrary ordered, but multiple runs of the same MapReduce job will always have the same ordering.

Option D

Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted values.

Correct Answer B
Explanation Explanation: Note: * Input to the Reducer is the sorted output of the mappers. * The framework calls the application's Reduce function once for each unique key in the sorted order. * Example: For the given sample input the first map emits: < Hello, 1> < World, 1> < Bye, 1> < World, 1> The second map emits: < Hello, 1> < Hadoop, 1> < Goodbye, 1> < Hadoop, 1>

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