pd

type Client interface {
	// GetClusterID gets the cluster ID from PD.
	GetClusterID() uint64
	// GetTS gets a timestamp from PD.
	GetTS() (int64, int64, error)
	// GetRegion gets a region and its leader Peer from PD by key.
	// The region may expire after split. Caller is responsible for caching and
	// taking care of region change.
	// Also it may return nil if PD finds no Region for the key temporarily,
	// client should retry later.
	GetRegion(key []byte) (*metapb.Region, *metapb.Peer, error)
	// GetStore gets a store from PD by store id.
	// The store may expire later. Caller is responsible for caching and taking care
	// of store change.
	GetStore(storeID uint64) (*metapb.Store, error)
	// Close closes the client.
	Close()
}