From 86eae02366feb716bf3e847f822008557f043966 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Markus=20M=C3=A4kel=C3=A4?= <markus.makela@mariadb.com>
Date: Mon, 5 Mar 2018 08:35:07 +0200
Subject: [PATCH] Log message on failed worker message

When a worker message fails, an error message should be logged to know why
it failed.
---
 server/core/messagequeue.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/server/core/messagequeue.cc b/server/core/messagequeue.cc
index a741edcf3..2731394a0 100644
--- a/server/core/messagequeue.cc
+++ b/server/core/messagequeue.cc
@@ -176,6 +176,11 @@ bool MessageQueue::post(const Message& message) const
     {
         ssize_t n = write(m_write_fd, &message, sizeof(message));
         rv = (n == sizeof(message));
+
+        if (n == -1)
+        {
+            MXS_ERROR("Failed to write message: %d, %s", errno, mxs_strerror(errno));
+        }
     }
     else
     {