Playbooks

Choose a transport

Records must move from a producer to consumers: a synchronous call, a queue, publish/subscribe or a log? Three questions pick the transport; five settings then make it safe.

Handle overload

Work arrives faster than it can be served: break the circuit to a failing dependency, buffer a burst, slow the source, refuse at the door, or shed? Four questions pick the response; two checks keep it from spreading.

Choose a partitioning

Records are split across N partitions or shards: round-robin, hash or range, by which key, with how many partitions, and what happens to skew, order and failures?

Make effects repeatable

Messages can arrive more than once and consumers can crash mid-way: list every effect, make each one safe to repeat, commit progress after the work, and prove it by crashing the consumer.