Concurrent Hash Map Designs: Synchronized, Sharding, and ConcurrentHashMap
Hi everyone!
I wrote a deep-dive comparing three common approaches to building concurrent hash maps across the Java/Rust ecosystem: a single global lock (synchronized), sharding (DashMap-style), and Java’s ConcurrentHashMap.
The post focuses on why these designs look the way they do—lock granularity, CAS fast paths, resize behavior, and some JMM/Unsafe details—rather than just how to use them.
Would love feedback!
submitted by /u/Charming-Top-8583
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