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Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) Sample Questions:

1. What data does a Reducer reduce method process? Reference: Yahoo! Hadoop Tutorial, Module 4:
MapReduce

A) All data for a given key, regardless of which mapper(s) produced it.
B) All data produced by a single mapper.
C) All data for a given value, regardless of which mapper(s) produced it.
D) All the data in a single input file.

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

A) The values are in sorted order.
B) Since the values come from mapper outputs, the reducers will receive contiguous sections of sorted
values.
C) The values are arbitrary ordered, but multiple runs of the same MapReduce job will always have the
same ordering.
D) The values are arbitrarily ordered, and the ordering may vary from run to run of the same MapReduce
job.

3. In a MapReduce job with 500 map tasks, how many map task attempts will there be?

A) Exactly 500.
B) Between 500 and 1000.
C) At least 500.
D) At most 500.
E) It depends on the number of reduces in the job.

4. Given a directory of files with the following structure:
line number, tab character, string:
Example:
1 abialkjfjkaoasdfjksdlkjhqweroij
2 kadfjhuwqounahagtnbvaswslmnbfgy
3 kjfteiomndscxeqalkzhtopedkfsikj
You want to send each line as one record to your Mapper. Which InputFormat should you use to complete
the line: conf.setInputFormat (____.class) ; ?

A) BDBInputFormat
B) SequenceFileAsTextInputFormat
C) KeyValueFileInputFormat
D) SequenceFileInputFormat

5. Which two of the following are true about this trivial Pig program' (choose Two)

A) The contents of myfile appear on stdout
B) myfile is read from the user's home directory in HDFS
C) ABC has a schema associated with it
D) Pig assumes the contents of myfile are comma delimited

Solutions: