Java Architect Essentials

Aug 22, 2025 · Fundamentals

How Bitmap and Bloom Filter Slash Memory Usage for Billions of IDs

This article explains how using a bitmap reduces the storage of 4 billion unsigned integers from 14.9 GB to about 476 MB, introduces the concept and benefits of bitmaps, and then details Bloom filter principles, advantages, limitations, common use cases, and Java/Redis implementation examples.