From fb9ffdc753d0c6ce5e1c38c7b62799a221cad717 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Markus=20M=C3=A4kel=C3=A4?= <markus.makela@mariadb.com>
Date: Wed, 15 Aug 2018 17:26:15 +0300
Subject: [PATCH] MXS-2015: Improve CDC connector error messages

The error messages now display the data received so far. This will help
resolve at which point the streaming process was when an error occurs.
---
 connectors/cdc-connector/cdc_connector.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/connectors/cdc-connector/cdc_connector.cpp b/connectors/cdc-connector/cdc_connector.cpp
index 9286aeff4..aa014b56e 100644
--- a/connectors/cdc-connector/cdc_connector.cpp
+++ b/connectors/cdc-connector/cdc_connector.cpp
@@ -28,6 +28,7 @@
 #include <poll.h>
 #include <sstream>
 #include <stdexcept>
+#include <iterator>
 #include <string.h>
 #include <sys/socket.h>
 #include <sys/types.h>
@@ -280,6 +281,11 @@ bool Connection::connect(const std::string& table, const std::string& gtid)
                 {
                     rval = true;
                 }
+                else
+                {
+                    m_error += ". Data received so far: ";
+                    std::copy(m_buffer.begin(), m_buffer.end(), std::back_inserter(m_error));
+                }
             }
         }
     }