Apache-Hadoop-Developer Study Materials, HDPCD Practice Exam

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Exam Code: Apache-Hadoop-Developer
Exam Name: Hadoop 2.0 Certification exam for Pig and Hive Developer
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Apache-Hadoop-Developer Study Materials Total Q&A: 110 Questions and Answers
Last Update: 2016-08-08

Apache-Hadoop-Developer Exam Questions Detail: Apache-Hadoop-Developer Study Materials

 
Exam Code: HDPCD
Exam Name: Hortonworks Data Platform Certified Developer
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HDPCD Practice Exam Total Q&A: 110 Questions and Answers
Last Update: 2016-08-08

HDPCD Actual Test Detail: HDPCD Practice Exam

 

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NO.1 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 data types specified in HADOOP_MAP_DATATYPES environment variable
B. The mapper-specification.xml file submitted with the job determine the mapper's input key and
value types.
C. The key and value types specified in the JobConf.setMapInputKeyClass and
JobConf.setMapInputValuesClass methods
D. The InputFormat used by the job determines the mapper's input key and value types.
Answer: D

Apache-Hadoop-Developer Actual Test   
Explanation:
The input types fed to the mapper are controlled by the InputFormat used.
The default input format, "TextInputFormat," will load data in as (LongWritable, Text) pairs.
The long value is the byte offset of the line in the file. The Text object holds the string
contents of the line of the file.
Note: The data types emitted by the reducer are identified by setOutputKeyClass()
andsetOutputValueClass(). The data types emitted by the reducer are identified by
setOutputKeyClass() and setOutputValueClass().
By default, it is assumed that these are the output types of the mapper as well. If this is not
the case, the methods setMapOutputKeyClass() and setMapOutputValueClass() methods
of the JobConf class will override these.
Reference: Yahoo! Hadoop Tutorial, THE DRIVER METHOD

NO.2 Review the following data and Pig code:
What command to define B would produce the output (M,62,95l02) when invoking the DUMP
operator on B?
A. B= FOREACH A BY (gender = = 'M' AND zip = = '95102');
B. B = JOIN A BY (gender = = 'M' AND zip = = '95102');
C. B= GROUP A BY (zip = = '95102' AND gender = = 'M');
D. B = FILTER A BY (zip = = '95102' AND gender = = M");
Answer: D

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Posted 2016/8/9 21:32:51  |  Category: Hortonworks  |  Tag: Apache-Hadoop-DeveloperHDPCD Practice QuestionsHortonworks
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