CONCURUPDATABLE

CONCURUPDATABLE is a term used in computer science to describe data structures, systems, or interfaces that support concurrent updates to a shared state in a way that preserves correctness for all participants.

A CONCURUPDATABLE design specifies that updates made by different actors are applied in a manner that is observable and consistent under a defined model, such as linearizability, sequential consistency, or eventual consistency.

Key characteristics include atomic application of updates, clear visibility rules, and mechanisms to resolve conflicts.

Common techniques include optimistic concurrency control (where conflicts are detected at commit time), pessimistic locking, multi-version concurrency control (MVCC), and lock-free or wait-free algorithms. CRDTs are a related approach used for distributed systems that require high availability with automatically converging state despite concurrent updates.

Applications include databases, distributed caches, real-time collaboration tools, and stateful services in microservice architectures.

Challenges include balancing performance and consistency, handling contention, memory overhead, and proving correctness.

Related concepts include CRDTs, MVCC, lock-free programming, transactional memory, and linearizability.