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

1. What does the following WebHDFS command do?
Curl -1 -L "http://host:port/webhdfs/v1/foo/bar?op=OPEN"

A) Make a directory /foo/bar
B) Delete a directory /foo/bar
C) Read a file /foo/bar
D) List a directory /foo

2. Which Two of the following statements are true about hdfs? Choose 2 answers

A) An HDFS file that is larger than dfs.block.size is split into blocks
B) HDFS works best when storing a large number of relatively small files
C) Blocks are replicated to multiple datanodes
D) Block sizes for all files must be the same size

3. Determine which best describes when the reduce method is first called in a MapReduce job?

A) Reduce methods and map methods all start at the beginning of a job, in order to provide optimal performance for map-only or reduce-only jobs.
B) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed. The reduce method is called as soon as the intermediate key-value pairs start to arrive.
C) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed. The programmer can configure in the job what percentage of the intermediate data should arrive before the reduce method begins.
D) Reducers start copying intermediate key-value pairs from each Mapper as soon as it has completed. The reduce method is called only after all intermediate data has been copied and sorted.

4. Which one of the following statements is false about HCatalog?

A) Designed to be used by other programs such as Pig, Hive and MapReduce
B) Provides a shared schema mechanism
C) Exists as a subproject of Hive
D) Stores HDFS data in a database for performing SQL-like ad-hoc queries

5. Examine the following Hive statements:

Assuming the statements above execute successfully, which one of the following statements is true?

A) The output of each reducer is only the age column
B) The output is guaranteed to be a single file with all the data sorted by age
C) Each reducer generates a file sorted by age
D) The SORT BY command causes only one reducer to be used

Solutions: