avoid NaN

jizhuozhi.george · jizhuozhi.george · commit 9520c16dda15 · 2024-12-01T13:32:02.000+08:00
diff --git a/rootfs/etc/nginx/lua/balancer/ewma.lua b/rootfs/etc/nginx/lua/balancer/ewma.lua
@@ -130,7 +130,7 @@ local function get_or_update_ewma(upstream, rtt, failed, update)
 
   unlock()
 
-  local success_rate = 1 - failed_ewma / total_ewma
+  local success_rate = 1 - failed_ewma / (total_ewma+1)
 
   if success_rate < MIN_SUCCESS_RATE then
     success_rate = MIN_SUCCESS_RATE
