shard

Documentation

Index

• func ShuffleShardExpectedInstances(shardSize, numZones int) int
• func ShuffleShardExpectedInstancesPerZone(shardSize, numZones int) int
• func ShuffleShardSeed(identifier, zone string) int64

Functions

func ShuffleShardExpectedInstances

func ShuffleShardExpectedInstances(shardSize, numZones int) int

ShuffleShardExpectedInstances returns the total number of instances that should be selected for a given tenant. If zone-aware replication is disabled, the input numZones should be 1.

func ShuffleShardExpectedInstancesPerZone

func ShuffleShardExpectedInstancesPerZone(shardSize, numZones int) int

ShuffleShardExpectedInstancesPerZone returns the number of instances that should be selected for each zone when zone-aware replication is enabled. The algorithm expects the shard size to be divisible by the number of zones, in order to have nodes balanced across zones. If it's not, we do round up.

func ShuffleShardSeed

func ShuffleShardSeed(identifier, zone string) int64

ShuffleShardSeed returns seed for random number generator, computed from provided identifier.