Hadoop 2.0 Certification exam for Pig and Hive Developer Apache-Hadoop-Developer exam vce dumps preparation

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

1. Given the following Pig command:
logevents = LOAD 'input/my.log' AS (date:chararray, levehstring, code:int, message:string);
Which one of the following statements is true?

A) The logevents relation represents the data from the my.log file, using a tab as the parsing delimiter
B) The statement is not a valid Pig command
C) The logevents relation represents the data from the my.log file, using a comma as the parsing delimiter
D) The first field of logevents must be a properly-formatted date string or table return an error

2. In the reducer, the MapReduce API provides you with an iterator over Writable values. What does calling the next () method return?

A) It returns a reference to a Writable object from an object pool.
B) It returns a reference to the same Writable object each time, but populated with different data.
C) It returns a reference to a different Writable object time.
D) It returns a reference to the same Writable object if the next value is the same as the previous value, or a new Writable object otherwise.
E) It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object or a new object.

3. Your cluster's HDFS block size in 64MB. You have directory containing 100 plain text files, each of which is 100MB in size. The InputFormat for your job is TextInputFormat. Determine how many Mappers will run?

A) 64
B) 640
C) 100
D) 200

4. Can you use MapReduce to perform a relational join on two large tables sharing a key? Assume that the two tables are formatted as comma-separated files in HDFS.

A) No, MapReduce cannot perform relational operations.
B) No, but it can be done with either Pig or Hive.
C) Yes, but only if one of the tables fits into memory
D) Yes, so long as both tables fit into memory.
E) Yes.

5. Which one of the following classes would a Pig command use to store data in a table defined in HCatalog?

A) org.apache.hcatalog.pig.HCatOutputFormat
B) org.apache.hcatalog.pig.HCatStorer
C) Pig scripts cannot use an HCatalog table
D) No special class is needed for a Pig script to store data in an HCatalog table

Solutions: