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Hortonworks HADOOP-PR000007 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Pig Development | - Pig data types and UDFs - Pig Latin scripting |
| Hadoop Core Concepts | - YARN and MapReduce fundamentals - HDFS architecture and commands |
| Hive Development | - Hive table definitions and queries - Hive optimization and execution |
| Hadoop Ecosystem Tools | - Sqoop and data ingestion - Workflow and processing frameworks |
Hortonworks-Certified-Apache-Hadoop-2.0-Developer(Pig and Hive Developer) Sample Questions:
You are developing a MapReduce job for sales reporting. The mapper will process input keys
representing the year (IntWritable) and input values representing product indentifies (Text).
Indentify what determines the data types used by the Mapper for a given job.
- A. The mapper-specification.xml file submitted with the job determine the mapper's input key and value
types. - B. The data types specified in HADOOP_MAP_DATATYPES environment variable
- C. The InputFormat used by the job determines the mapper's input key and value types.
- D. The key and value types specified in the JobConf.setMapInputKeyClass and
JobConf.setMapInputValuesClass methods
Correct Answer: C 🗳️
Consider the following two relations, A and B.
What is the output of the following Pig commands?
X = GROUP A BY S1; DUMP X;
- A. Option B
- B. Option D
- C. Option C
- D. Option A
Correct Answer: B 🗳️
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 different Writable object time.
- B. It returns a reference to the same Writable object each time, but populated with different data.
- C. It returns a reference to a Writable object. The API leaves unspecified whether this is a reused object
or a new object. - D. It returns a reference to a Writable object from an object pool.
- E. 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.
Correct Answer: B 🗳️
You have a directory named jobdata in HDFS that contains four files: _first.txt, second.txt, .third.txt and
# data.txt. How many files will be processed by the FileInputFormat.setInputPaths () command when it's
given a path object representing this directory?
- A. None, the directory cannot be named jobdata
- B. Three, the pound sign is an invalid character for HDFS file names
- C. Four, all files will be processed
- D. One, no special characters can prefix the name of an input file
- E. Two, file names with a leading period or underscore are ignored
Correct Answer: E 🗳️
Which one of the following statements is true regarding a MapReduce job?
- A. The job's Partitioner shuffles and sorts all (key.value) pairs and sends the output to all reducers
- B. The default Hash Partitioner sends key value pairs with the same key to the same Reducer
- C. The Mapper must sort its output of (key.value) pairs in descending order based on value
- D. The reduce method is invoked once for each unique value
Correct Answer: A 🗳️
