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

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

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

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

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

3. You are developing a combiner that takes as input Text keys, IntWritable values, and emits Text keys, IntWritable values. Which interface should your class implement?

A) Reducer <Text, IntWritable, Text, IntWritable>
B) Reducer <Text, Text, IntWritable, IntWritable>
C) Combiner <Text, Text, IntWritable, IntWritable>
D) Mapper <Text, IntWritable, Text, IntWritable>
E) Combiner <Text, IntWritable, Text, IntWritable>

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

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

5. Which HDFS command copies an HDFS file named foo to the local filesystem as localFoo?

A) hadoop -cp foo LocalFoo
B) hadoop fs -Is foo
C) hadoop fs -get foo LocalFoo
D) hadoop fs -put foo LocalFoo

Solutions: