Consistent hashing to a subset of nodes. It works like consistent hash,

but instead of mapping to a single node, we map to a subset of nodes.

rootfs/etc/nginx/lua/balancer/chash.lua

@@ -8,7 +8,7 @@ function _M.new(self, backend)
   local nodes = util.get_nodes(backend.endpoints)
   local o = {
     instance = self.factory:new(nodes),
-    hash_by = backend["upstream-hash-by"],
+    hash_by = backend["upstreamHashByConfig"]["upstream-hash-by"],
     traffic_shaping_policy = backend.trafficShapingPolicy,
     alternative_backends = backend.alternativeBackends,
   }