rr lb优化：在第一次初始化时offset使用随机数，以适配每次都是在新线程使用的场景 (apache#2289)

yanglimingcn · Oct 31, 2023 · 61c3386 · 61c3386
1 parent 510b1a5
commit 61c3386
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/src/brpc/policy/round_robin_load_balancer.cpp b/src/brpc/policy/round_robin_load_balancer.cpp
@@ -120,7 +120,9 @@ int RoundRobinLoadBalancer::SelectServer(const SelectIn& in, SelectOut* out) {
     TLS tls = s.tls();
     if (tls.stride == 0) {
         tls.stride = GenRandomStride();
-        tls.offset = 0;
+        // use random at first time, for the case of
+        // use rr lb every time in new thread
+        tls.offset = butil::fast_rand_less_than(n);
     }
 
     for (size_t i = 0; i < n; ++i) {