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Question ID 12479

To process input key-value pairs, your mapper needs to lead a 512 MB data file in memory.
What is the best way to accomplish this?

Option A

Serialize the data file, insert in it the JobConf object, and read the data into memory in the configure method of the mapper.

Option B

Place the data file in the DistributedCache and read the data into memory in the map method of the mapper.

Option C

Place the data file in the DataCache and read the data into memory in the configure method of the mapper.

Option D

Place the data file in the DistributedCache and read the data into memory in the configure method of the mapper.

Correct Answer C
Explanation


Question ID 12480

You want to populate an associative array in order to perform a map-side join. Youve
decided to put this information in a text file, place that file into the DistributedCache and
read it in your Mapper before any records are processed.
Indentify which method in the Mapper you should use to implement code for reading the file
and populating the associative array?

Option A

combine

Option B

 map

Option C

init

Option D

configure

Correct Answer B
Explanation Reference: org.apache.hadoop.filecache , Class DistributedCache

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