Question 6 of 60
Assuming default settings, which best describes the order of data provided to a reducer's reduce method:
Correct Answer: D
Question 7 of 60
You wrote a map function that throws a runtime exception when it encounters a control character in input data. The input supplied to your mapper contains twelve such characters totals, spread across five file splits. The first four file splits each have two control characters and the last split has four control characters.
Indentify the number of failed task attempts you can expect when you run the job with mapred.max.map.attempts set to 4:
Indentify the number of failed task attempts you can expect when you run the job with mapred.max.map.attempts set to 4:
Correct Answer: E
There will be four failed task attempts for each of the five file splits.
Note:
E
Note:
EQuestion 8 of 60
You want to populate an associative array in order to perform a map-side join. You've 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?
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?
Correct Answer: D
Question 9 of 60
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?
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?
Correct Answer: F
Question 10 of 60
Can you use MapReduce to perform a relational join on two large tables sharing a key? Assume that the two tables are formatted as comma-separated files in
HDFS.
HDFS.
Correct Answer: A