Location based Load Balancing (cherry-pick #10720 from release-1.1 to master)#11256
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istio-testing merged 2 commits intoistio:masterfrom Jan 25, 2019
Merged
Location based Load Balancing (cherry-pick #10720 from release-1.1 to master)#11256istio-testing merged 2 commits intoistio:masterfrom
istio-testing merged 2 commits intoistio:masterfrom
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Implement locality aware routing based on Envoy lbEndpoints priority. Traffic will be routed to endpoints in same subzone, then failover to all in same zone, then failover to all in same region. This is the typical expected behavior for most setups. The explicit failover to a specific region allows people to maintain traffic within the same country if desired. Support Locality weighted load balancing. In order to use this feature, DestinationRule.TrafficPolicy.LoadBalancer.LocalityWeightSettings has to be configured. Currently we support specifying each groups of locality endpoints with a weight. For example , traffic locality A --> locality A with 80% locality A --> locality B with 10% locality A --> locality C with 10%
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Support Locality-weighted load balancing
Allows administrators to control the distribution of traffic to endpoints based on the localities of where the traffic originates and where it will terminate. These localities are specified using arbitrary labels that designate a hierarchy of localities in {region}/{zone}/{sub-zone} form. For additional detail refer to https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/load_balancing/locality_weight
Implement locality aware routing based on Envoy lbEndpoints priority.
By default traffic will be routed to endpoints in same {region}/{zone}/{sub-zone}, then failover to all in same {region}/{zone}, then failover to all in same {region}, at last failover to those in other regions. This is the typical expected behavior for most setups. The explicit Failover setting to a specific region allows admins to restrict the regionality of failover. Assume a service resides in zones within us-east, us-west & eu-west, when endpoints within us-east become unhealthy traffic should failover to endpoints within eu-west and similarly us-west should failover to us-east.