placement

type Key struct {
	TenantID    string
	DatasetName string

	Tenant      uint64
	Dataset     uint64
	Fingerprint uint64
}

type Placement struct {
	// Note that the instances reference shared objects, and must not be modified.
	Instances []*ring.InstanceDesc
	Shard     uint32
	// contains filtered or unexported fields
}

type Strategy interface {
	// NumTenantShards returns the number of shards
	// for a tenant from n total.
	NumTenantShards(k Key, n uint32) (size uint32)
	// NumDatasetShards returns the number of shards
	// for a dataset from n total.
	NumDatasetShards(k Key, n uint32) (size uint32)
	// PickShard returns the shard index
	// for a given key from n total.
	PickShard(k Key, n uint32) (shard uint32)
}