From 6897d5da654f9fa8fe8f29a2975ff3771de1f6e3 Mon Sep 17 00:00:00 2001
From: srikailash <srikailashukcs@gmail.com>
Date: Tue, 13 Feb 2018 14:00:39 +0100
Subject: [PATCH] Adds ability to configure ZoneAwareLoadBalancing settings as
 config options  (#480)

This adds ability to configure settings for zone aware load balancing settings as config options.
solves envoyproxy/envoy#1344

Changes : Added min_cluster_size and enabled_percentage to commonLbConfig which enables them to used directly in load_balancer_impl.cc.

Signed-off-by: sri kailash <sri.gandebathula@booking.com>
---
 envoy/api/v2/cds.proto | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/envoy/api/v2/cds.proto b/envoy/api/v2/cds.proto
index ddaf2d0d..59e38f75 100644
--- a/envoy/api/v2/cds.proto
+++ b/envoy/api/v2/cds.proto
@@ -365,6 +365,21 @@ message Cluster {
     // .. note::
     //   The specified percent will be truncated to the nearest 1%.
     core.Percent healthy_panic_threshold = 1;
+    message ZoneAwareLbConfig {
+      // [#not-implemented-hide:]
+      // Configures percentage of requests that will be considered for zone aware routing
+      // if zone aware routing is configured. If not specified, the default is 100%.
+      // * :ref:`runtime values <config_cluster_manager_cluster_runtime_zone_routing>`.
+      // * :ref:`Zone aware routing support <arch_overview_load_balancing_zone_aware_routing>`.
+      core.Percent routing_enabled = 1;
+      // [#not-implemented-hide:]
+      // Configures minimum upstream cluster size required for zone aware routing
+      // If upstream cluster size is less than specified, zone aware routing is not performed
+      // even if zone aware routing is configured. If not specified, the default is 6.
+      // * :ref:`runtime values <config_cluster_manager_cluster_runtime_zone_routing>`.
+      // * :ref:`Zone aware routing support <arch_overview_load_balancing_zone_aware_routing>`.
+      google.protobuf.UInt64Value min_cluster_size = 2;
+    }
   }
 
   // Common configuration for all load balancer implementations.