Module cluster_state 

Plain-data mirror of a managed cluster’s durable configuration.

These types carry the slices of a managed cluster’s config that a caller reasons over without touching the catalog or SQL layers. Keeping them free of catalog and SQL dependencies lets one component reason over the config and another project the live config onto the same types, without either depending on the other.

ExpectedClusterState is a compare-and-append witness. A caller captures it from a config snapshot and pairs it with a conditional write. The applier re-projects the live config and applies the write only if it still equals the witness.

Structs

AvailabilityZonePool

An unordered set of availability zones: an AvailabilityZones provisioning list reduced to membership. Produced by AvailabilityZones::pool for the one comparison that must ignore order, replica interchangeability.

AvailabilityZones

The availability zones a managed cluster’s replicas are provisioned across, in configured provisioning order.

BurstRecord

An active hydration-burst record, mirrored from durable state.

ExpectedClusterState

Compare-and-append witness over a managed cluster’s durable config: the fields a conditional write is conditioned on. The applier applies the write only if the cluster’s current config still projects to an equal witness.

ReconfigurationRecord

An in-flight graceful reconfiguration record, mirrored from durable state.

ReconfigurationTarget

The full config shape a reconfiguration is moving the cluster to. Distinct from a replica shape because it additionally carries replication_factor, a cluster-level rather than replica-level dimension.

ReplicaShape

The config dimensions that distinguish one replica from another. Two replicas with equal shape are interchangeable. An AVAILABILITY ZONES difference is a shape difference, but only as an unordered pool: reordering the same zones does not change a replica’s shape (see ReplicaShape::matches).