Refactor proto actor runtime with snapshot support #3283
Merged
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This PR updates the proto actor runtime implementation by removing the need to create and update workflow instance documents continuously.
Instead, workflow instances now purely live in-memory in the proto actor runtime as virtual actors aka grains.
Each workflow instance grain persists snapshots after every workflow execution. The snapshot persistence provider is pluggable and uses an in-memory provider by default.
We still need a way to persist a full/current view of workflow instances for e.g. dashboarding. But this aspect is now pluggable and can use different strategies. Examples are:
These export operations will happen asynchronously in the background, preventing them from hindering workflow execution throughput.