Concurrency Articles | Backend Study Lab

System Design Jun 29, 2026 4 min read

Distributed Locks Explained

Learn what distributed locks are, when backend systems use them, why they are risky, and what safer alternatives to consider.

System Design Jun 28, 2026 4 min read

Learn how optimistic locking prevents lost updates in backend systems using version columns, compare-and-swap updates, and 409 conflicts.

Java Mar 15, 2026 4 min read

A practical explanation of ConcurrentHashMap in Java, including thread safety, atomic methods, iteration behavior, and common mistakes.

Java Jan 8, 2026 4 min read

Compare HashMap and Hashtable in Java, including synchronization, null keys, performance, legacy status, and modern alternatives.