MakeQueryState creates an initialized QueryState.

NewOracle creates an oracle with the given policy.

RegisterPolicy creates a new policy given an OracleFactory.

BinPackingChoice gives preference to leaseholders if possible, otherwise bin-packs the choices.

ClosestChoice chooses the node closest to the current node.

PreferFollowerChoice prefers choosing followers over leaseholders.

RandomChoice chooses lease replicas randomly.

Config is used to construct an OracleFactory.

QueryState encapsulates the history of assignments of ranges to nodes done by an oracle on behalf of one particular query.

ReplicaDescriptorEx is a small extension of the roachpb.ReplicaDescriptor that also stores whether this replica info should be ignored for the purposes of misplanned ranges.

Oracle is used to choose the lease holder for ranges.

OracleFactory creates an oracle from a Config.

Policy determines how an Oracle should select a replica.