Actors vs Queues and Logs Choosing the right building block for asynchronous workloads is critical. Actors excel at managing in-memory state and orchestrating concurrent work. Their mailboxes are ephemeral and rely on best-effort delivery. If a process crashes, in-flight messages may be lost. For workflows that demand durable delivery, ordering or replay, a dedicated queue or log is the safer option. The diagram below contrasts direct actor messaging with using a persistent queue or log. Read more...