ExecutionLease
Whether the command the kernel executes in this coroutine runs on the owner of its log partition (C2 and C4), as the router that chose this node says:
HELD: this node holds the partition's lease and accepts its commands. Only then may a decide that does I/O skip the request-id lookup, on a miss of a complete set of the aggregate's recent requests.
NOT_HELD: the command runs here without the lease, degraded to
Localor for a partition about to be acquired. Its states are not cached: another node may be committing to the aggregate meanwhile.
Without either (a Local router, a context without a lease group, a command intake), states are cached as before and a decide that does I/O always looks its request id up on a miss.