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Hortonworks Apache-Hadoop-Developer Exam Syllabus Topics:

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

1. Which one of the following statements describes a Pig bag. tuple, and map, respectively?

A) Unordered collection of tuples, ordered set of fields, set of key value pairs
B) Ordered set of fields, ordered collection of tuples, ordered collection of maps
C) Ordered collection of maps, ordered collection of bags, and unordered set of key/value pairs
D) Unordered collection of maps, ordered collection of tuples, ordered set of key/value pairs

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

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

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

A) 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.
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) One final key-value pair per value associated with the key; no restrictions on the type.
D) One final key-value pair per key; no restrictions on the type.
E) As many final key-value pairs as desired, but they must have the same type as the intermediate key-value pairs.

4. You need to perform statistical analysis in your MapReduce job and would like to call methods in the Apache Commons Math library, which is distributed as a 1.3 megabyte Java archive (JAR) file. Which is the best way to make this library available to your MapReducer job at runtime?

A) When submitting the job on the command line, specify the -libjars option followed by the JAR file path.
B) Package your code and the Apache Commands Math library into a zip file named JobJar.zip
C) Have your system administrator copy the JAR to all nodes in the cluster and set its location in the HADOOP_CLASSPATH environment variable before you submit your job.
D) Have your system administrator place the JAR file on a Web server accessible to all cluster nodes and then set the HTTP_JAR_URL environment variable to its location.

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

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

Solutions: