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Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) Sample Questions:

1. Which one of the following is NOT a valid Oozie action?

A) pig
B) mrunit
C) hive
D) mapreduce

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

3. You wrote a map function that throws a runtime exception when it encounters a control character in input
data. The input supplied to your mapper contains twelve such characters totals, spread across five file
splits. The first four file splits each have two control characters and the last split has four control
characters.
Indentify the number of failed task attempts you can expect when you run the job with
mapred.max.map.attempts set to 4:

A) You will have seventeen failed task attempts
B) You will have five failed task attempts
C) You will have forty-eight failed task attempts
D) You will have twenty failed task attempts
E) You will have twelve failed task attempts

4. A client application creates an HDFS file named foo.txt with a replication factor of 3. Identify which best
describes the file access rules in HDFS if the file has a single block that is stored on data nodes A, B and
C?

A) Each data node locks the local file to prohibit concurrent readers and writers of the file.
B) Each data node stores a copy of the file in the local file system with the same name as the HDFS file.
C) The file will be marked as corrupted if data node B fails during the creation of the file.
D) The file can be accessed if at least one of the data nodes storing the file is available.

5. Examine the following Pig commands:

Which one of the following statements is true?

A) The reducers will only output the first 20% of the data passed from the mappers
B) A random sample of approximately 20% of the data will be output
C) Each MapReduce task will terminate after executing for 0.2 minutes
D) The SAMPLE command generates an "unexpected symbol" error

Solutions: