From 642b09c8d6675a60ab8f69b68519d39f1e1f437d Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Thu, 18 Apr 2019 22:45:46 +0300
Subject: [PATCH] Added clarifications #5010

---
 dbms/src/Formats/ProtobufReader.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dbms/src/Formats/ProtobufReader.cpp b/dbms/src/Formats/ProtobufReader.cpp
index 17b763b043b..be31032f326 100644
--- a/dbms/src/Formats/ProtobufReader.cpp
+++ b/dbms/src/Formats/ProtobufReader.cpp
@@ -43,7 +43,7 @@ namespace
 
     void unknownFormat()
     {
-        throw Exception("Protobuf messages are corrupted or doesn't match the provided schema", ErrorCodes::UNKNOWN_PROTOBUF_FORMAT);
+        throw Exception("Protobuf messages are corrupted or doesn't match the provided schema. Please note that Protobuf stream is length-delimited: every message is prefixed by its length in varint.", ErrorCodes::UNKNOWN_PROTOBUF_FORMAT);
     }
 }