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, including mapper, shuffler, and reducer components, along with unit tests and comprehensive documentation. It processes large datasets in parallel, improving efficiency.

Changes

File	Summary
map-reduce/README.md	This file provides a comprehensive guide to the MapReduce design pattern in Java. It includes a detailed explanation, real-world examples, a programmatic example with code snippets, and a discussion of benefits and trade-offs.
map-reduce/etc/map-reduce.png	New file: Diagram showing the MapReduce pattern.
map-reduce/etc/map-reduce.urm.puml	New file: UML diagram for the MapReduce classes.
map-reduce/pom.xml	This file configures the Maven project for the MapReduce module, including dependencies and build settings.
map-reduce/src/main/java/com/iluwatar/Main.java	This is the main class that runs the MapReduce process and prints the results to the console.
map-reduce/src/main/java/com/iluwatar/MapReduce.java	This class orchestrates the MapReduce process by calling the mapper, shuffler, and reducer components.
map-reduce/src/main/java/com/iluwatar/Mapper.java	This class implements the map function, processing input strings and generating key-value pairs.
map-reduce/src/main/java/com/iluwatar/Reducer.java	This class implements the reduce function, aggregating values for each key.
map-reduce/src/main/java/com/iluwatar/Shuffler.java	This class implements the shuffle function, grouping values by key.
map-reduce/src/test/java/com/iluwatar/MapReduceTest.java	This file contains unit tests for the MapReduce class, verifying the correctness of the overall process.
map-reduce/src/test/java/com/iluwatar/MapperTest.java	This file contains unit tests for the Mapper class, ensuring the correct mapping of input strings.
map-reduce/src/test/java/com/iluwatar/ReducerTest.java	This file contains unit tests for the Reducer class, validating the aggregation of values.
map-reduce/src/test/java/com/iluwatar/ShufflerTest.java	This file contains unit tests for the Shuffler class, verifying the correct grouping of values by key.
pom.xml	The map-reduce module was added to the root pom.xml file.

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autogenerated by presubmit.ai

[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)

[iluwatar]

The new module should be added to parent pom.xml. Otherwise it won't be built by CI.

[github-actions]

✅ LGTM!

Review Summary

Commits Considered (1)

• 8fc6130: added module to parent pom

Files Processed (2)

• map-reduce/README.md (1 hunk)
• pom.xml (1 hunk)

Actionable Comments (0)

Skipped Comments (0)

[github-actions]

✅ LGTM!

Review Summary

Commits Considered (1)

• 30f97de: Merge branch 'master' into map-reduce

Files Processed (1)

• pom.xml (1 hunk)

Actionable Comments (0)

Skipped Comments (0)

[sonarqubecloud]

Quality Gate failed

Failed conditions
67.2% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud