June 2019
Beginner to intermediate
360 pages
10h 55m
English
Content preview from Big Data Simplified
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74 | Big Data Simplied
Data Types: Java Vs. MapReduce
JAVA MapReduce
String Text
Int IntWritable
Long LongWritable
Null NullWritable
4.2.3 End-to-End Technical Anatomy of a MapReduce Job
1. Driver/Controller Class
/** Entry-point for MapReduce program. Constructs a Job object
representing a single Map-Reduce and asks Hadoop to run it.
Whenrunning on a cluster, the final “wait For Completion call
will distribute the code for this job across the cluster through
ResourceManager.
**/
public class WordCountDriver{
public static void main(String[] args) throws Exception {
/* Create an object to represent a Job. */
Job job = new Job(conf, “wordcount”);
/** Tell ...
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