Module barrier 

Cross-instance barrier protocol. Direct gRPC leader-to-follower calls under cluster, falling back to gossip-KV announce/ack/poll.

Structs

BarrierAck

Follower ack. ok = false forces the leader to abort instead of wait.

BarrierAnnouncement

Leader-written barrier announcement.

BarrierCoordinator

Cross-instance barrier coordination.

InMemoryKv

In-memory KV for tests.

Enums

Phase

Barrier phase.

QuorumOutcome

Outcome of wait_for_quorum.

Constants

ACK_KEY

KV key for a follower’s barrier ack.

ANNOUNCEMENT_KEY

KV key for the leader’s barrier announcement.

BARRIER_ADDR_KEY

Gossip KV key used by follower barrier servers to advertise their bound address.

Traits

ClusterKv

Gossip-KV seam.