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

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

2. In a large MapReduce job with m mappers and n reducers, how many distinct copy
operations will there be in the sort/shuffle phase?

A) m
B) mn (i.e., m to the power of n)
C) n
D) m+n (i.e., m plus n)
E) mXn (i.e., m multiplied by n)

3. Given the following Hive commands:

Which one of the following statements Is true?

A) The file mydata.txt is copied to a subfolder of /apps/hive/warehouse
B) The file mydata.txt is moved to a subfolder of /apps/hive/warehouse
C) The file mydata.txt is copied into Hive's underlying relational database 0.
D) The file mydata.txt does not move from Its current location in HDFS

4. Review the following data and Pig code.
M,38,95111 F,29,95060 F,45,95192 M,62,95102 F,56,95102
A = LOAD 'data' USING PigStorage('.') as (gender:Chararray, age:int, zlp:chararray);
B = FOREACH A GENERATE age;
Which one of the following commands would save the results of B to a folder in hdfs named myoutput?

A) STORE A INTO 'myoutput' USING PigStorage(',');
B) DUMP B using PigStorage('myoutput');
C) STORE B INTO 'myoutput';
D) DUMP B INTO 'myoutput';

5. Given the following Hive command:
INSERT OVERWRITE TABLE mytable SELECT * FROM myothertable;
Which one of the following statements is true?

A) A new table named mytable is created, and the contents of myothertable are copied into mytable
B) The statement is not a valid Hive command
C) Any existing data in mytable will be overwritten
D) The contents of myothertable are appended to mytable

Solutions: