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Hortonworks Hadoop 2.0 Certification exam for Pig and Hive Developer Sample Questions:

1. Given a directory of files with the following structure: line number, tab character, string:
Example:
1abialkjfjkaoasdfjksdlkjhqweroij
2kadfjhuwqounahagtnbvaswslmnbfgy
3kjfteiomndscxeqalkzhtopedkfsikj
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) SequenceFileAsTextInputFormat
B) KeyValueFileInputFormat
C) BDBInputFormat
D) SequenceFileInputFormat

2. For each intermediate key, each reducer task can emit:

A) One final key-value pair per key; no restrictions on the type.
B) As many final key-value pairs as desired. There are no restrictions on the types of those key-value pairs (i.e., they can be heterogeneous).
C) As many final key-value pairs as desired, but they must have the same type as the intermediate key-value pairs.
D) As many final key-value pairs as desired, as long as all the keys have the same type and all the values have the same type.
E) One final key-value pair per value associated with the key; no restrictions on the type.

3. Which HDFS command uploads a local file X into an existing HDFS directory Y?

A) hadoop fs -localPut X Y
B) hadoop fs -get X Y
C) hadoop fs-put X Y
D) hadoop scp X Y

4. When is the earliest point at which the reduce method of a given Reducer can be called?

A) As soon as a mapper has emitted at least one record.
B) As soon as at least one mapper has finished processing its input split.
C) Not until all mappers have finished processing all records.
D) It depends on the InputFormat used for the job.

5. Which one of the following statements is true regarding a MapReduce job?

A) The reduce method is invoked once for each unique value
B) The default Hash Partitioner sends key value pairs with the same key to the same Reducer
C) The job's Partitioner shuffles and sorts all (key.value) pairs and sends the output to all reducers
D) The Mapper must sort its output of (key.value) pairs in descending order based on value

Solutions: