From 490a07f5b6f8c461a46a045dd07025f5ce9c74ba Mon Sep 17 00:00:00 2001
From: qiaolongfei <qiaolongfei@baidu.com>
Date: Thu, 14 Jun 2018 09:22:59 +0800
Subject: [PATCH] add comment that out var of prefetch must be created in local
 scope

---
 paddle/fluid/operators/detail/grpc_server.cc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/paddle/fluid/operators/detail/grpc_server.cc b/paddle/fluid/operators/detail/grpc_server.cc
index 14152bded89..5a87258901c 100644
--- a/paddle/fluid/operators/detail/grpc_server.cc
+++ b/paddle/fluid/operators/detail/grpc_server.cc
@@ -169,6 +169,7 @@ class RequestPrefetch final : public RequestBase {
 
     auto scope = request_->GetMutableLocalScope();
     auto invar = scope->FindVar(in_var_name);
+    // out var must be created in local scope!
     framework::Variable* outvar = scope->Var(out_var_name);
 
     request_handler_->Handle(in_var_name, scope, invar, &outvar, out_var_name);
-- 
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