Added Map Reduce Design Pattern

[hvgh88]

Description:
Implemented MapReduce design pattern

Issue: Close #2927

[github-actions]

PR Summary

This PR implements the MapReduce design pattern, enabling parallel processing of large datasets. It includes the core components: Mapper, Reducer, and Shuffler, along with a MapReduce orchestrator and comprehensive unit tests. The implementation processes text, counting word occurrences. The design is explained in detail within the README, including real-world examples and comparisons to other patterns.

Changes

File	Summary
map-reduce/README.md	This file provides a comprehensive guide to the MapReduce design pattern. It includes a detailed explanation, real-world examples, a programmatic example in Java, and a discussion of when to use this pattern. It also covers benefits, trade-offs, and related patterns.
map-reduce/etc/map-reduce.png	New file: Diagram showing the MapReduce pattern.
map-reduce/etc/map-reduce.urm.puml	New file: PlantUML class diagram for the MapReduce implementation.
map-reduce/pom.xml	New file: Maven project configuration file for the MapReduce implementation.
map-reduce/src/main/java/com/iluwatar/Main.java	This Java class serves as the entry point for the MapReduce program. It sets up the input data and calls the MapReduce class to process it, then prints the results.
map-reduce/src/main/java/com/iluwatar/MapReduce.java	This Java class orchestrates the MapReduce process. It takes a list of strings as input, calls the mapper, shuffler, and reducer, and returns the final result.
map-reduce/src/main/java/com/iluwatar/Mapper.java	This Java class implements the map function, processing each input string and generating key-value pairs (word, count).
map-reduce/src/main/java/com/iluwatar/Reducer.java	This Java class implements the reduce function, aggregating the values for each key (word) to produce the final word counts.
map-reduce/src/main/java/com/iluwatar/Shuffler.java	This Java class implements the shuffle function, grouping the key-value pairs generated by the mappers based on the keys.
map-reduce/src/test/java/com/iluwatar/MapReduceTest.java	This Java class contains unit tests for the MapReduce class, verifying the correctness of the overall MapReduce process.
map-reduce/src/test/java/com/iluwatar/MapperTest.java	This Java class contains unit tests for the Mapper class, ensuring the mapper correctly processes input strings and generates word counts.
map-reduce/src/test/java/com/iluwatar/ReducerTest.java	This Java class contains unit tests for the Reducer class, verifying the reducer correctly aggregates word counts.
map-reduce/src/test/java/com/iluwatar/ShufflerTest.java	This Java class contains unit tests for the Shuffler class, checking that it correctly groups the key-value pairs.

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[github-actions]

✅ LGTM!

Review Summary

Commits Considered (2)

• 11c06fc: Updated README.md
• 3142dab: MapReduce design pattern added

Files Processed (13)

• map-reduce/README.md (1 hunk)
• map-reduce/etc/map-reduce.png (0 hunks)
• map-reduce/etc/map-reduce.urm.puml (1 hunk)
• map-reduce/pom.xml (1 hunk)
• map-reduce/src/main/java/com/iluwatar/Main.java (1 hunk)
• map-reduce/src/main/java/com/iluwatar/MapReduce.java (1 hunk)
• map-reduce/src/main/java/com/iluwatar/Mapper.java (1 hunk)
• map-reduce/src/main/java/com/iluwatar/Reducer.java (1 hunk)
• map-reduce/src/main/java/com/iluwatar/Shuffler.java (1 hunk)
• map-reduce/src/test/java/com/iluwatar/MapReduceTest.java (1 hunk)
• map-reduce/src/test/java/com/iluwatar/MapperTest.java (1 hunk)
• map-reduce/src/test/java/com/iluwatar/ReducerTest.java (1 hunk)
• map-reduce/src/test/java/com/iluwatar/ShufflerTest.java (1 hunk)

Actionable Comments (0)

Skipped Comments (0)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud