Great read. How does it handle out-of-order events or scenarios where events need to be processed in strict order across different partitions? Are there built-in mechanisms to enforce global ordering when needed?
If events need to be processed in strict order across different partitions, then you need to send these events to a single key (and thereby to a single partition). A partition consists of multiple service keys for which Restate ensures strict order processing. It is noteworthy that different keys don't block each other from being executed (no head of line blocking across different keys).
The order in which events are processed for each key is their arrival order. If you need to handle out-of-order events, then you can implement this as part of a virtual object which can store events and re-order them based on other events that carry some form of watermark or based on time.
