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

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

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

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

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

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

4. Which one of the following statements describes a Hive user-defined aggregate function?

A) Operates on a single input row and produces a table as output
B) Operates on multiple input rows and produces a table as output
C) Operates on multiple input rows and creates a single row as output
D) Operates on a single input row and produces a single row as output

5. Assuming default settings, which best describes the order of data provided to a reducer's reduce method:

A) The keys given to a reducer are in sorted order but the values associated with each key are in no predictable order
B) Neither keys nor values are in any predictable order.
C) The keys given to a reducer aren't in a predictable order, but the values associated with those keys always are.
D) Both the keys and values passed to a reducer always appear in sorted order.

Solutions: