Merge branch '2.2' into develop

Documentation/About/Limitations.md

@@ -10,6 +10,10 @@ In versions 2.1.2 and earlier, the configuration files are limited to 1024
 characters per line. This limitation was increased to 16384 characters in
 MaxScale 2.1.3.
 
+In versions 2.2.12 and earlier, the section names in the configuration files
+were limited to 49 characters. This limitation was increased to 1023 characters
+in MaxScale 2.2.13.
+
 ## Security limitiations
 
 ### MariaDB 10.2

Documentation/Changelog.md

@@ -38,6 +38,7 @@ For more details, please refer to:
   the master. There is also limited capability for rejoining nodes.
 
 For more details, please refer to:
+* [MariaDB MaxScale 2.2.13 Release Notes](Release-Notes/MaxScale-2.2.13-Release-Notes.md)
 * [MariaDB MaxScale 2.2.12 Release Notes](Release-Notes/MaxScale-2.2.12-Release-Notes.md)
 * [MariaDB MaxScale 2.2.11 Release Notes](Release-Notes/MaxScale-2.2.11-Release-Notes.md)
 * [MariaDB MaxScale 2.2.10 Release Notes](Release-Notes/MaxScale-2.2.10-Release-Notes.md)

Documentation/Release-Notes/MaxScale-2.2.13-Release-Notes.md

@@ -0,0 +1,35 @@
+# MariaDB MaxScale 2.2.13 Release Notes -- 2018-08
+
+Release 2.2.13 is a GA release.
+
+This document describes the changes in release 2.2.13, when compared to
+release 2.2.12.
+
+For any problems you encounter, please consider submitting a bug
+report on [our Jira](https://jira.mariadb.org/projects/MXS).
+
+## Bug fixes
+
+* [MXS-1997](https://jira.mariadb.org/browse/MXS-1997) Object names are limited to 49 characters
+* [MXS-1983](https://jira.mariadb.org/browse/MXS-1983) Failed to add dcb to epoll set
+* [MXS-1961](https://jira.mariadb.org/browse/MXS-1961) Standalone master loses master status
+
+## Known Issues and Limitations
+
+There are some limitations and known issues within this version of MaxScale.
+For more information, please refer to the [Limitations](../About/Limitations.md) document.
+
+## Packaging
+
+RPM and Debian packages are provided for supported the Linux distributions.
+
+Packages can be downloaded [here](https://mariadb.com/downloads/mariadb-tx/maxscale).
+
+## Source Code
+
+The source code of MaxScale is tagged at GitHub with a tag, which is identical
+with the version of MaxScale. For instance, the tag of version X.Y.Z of MaxScale
+is `maxscale-X.Y.Z`. Further, the default branch is always the latest GA version
+of MaxScale.
+
+The source code is available [here](https://github.com/mariadb-corporation/MaxScale).

server/core/messagequeue.cc

@@ -175,12 +175,57 @@ bool MessageQueue::post(const Message& message) const
     ss_dassert(m_pWorker);
     if (m_pWorker)
     {
-        ssize_t n = write(m_write_fd, &message, sizeof(message));
-        rv = (n == sizeof(message));
+        /**
+         * This is a stopgap measure to solve MXS-1983 that causes Resource temporarily
+         * unavailable errors. The errors are caused by the pipe buffer being too small to
+         * hold all worker messages. By retrying a limited number of times before giving
+         * up, the success rate for posted messages under heavy load increases
+         * significantly.
+         */
+        int fast = 0;
+        int slow = 0;
+        const int fast_size = 100;
+        const int slow_limit = 3;
+        ssize_t n;
+
+        while (true)
+        {
+            n = write(m_write_fd, &message, sizeof(message));
+            rv = (n == sizeof(message));
+
+            if (n == -1 && (errno == EAGAIN || errno == EWOULDBLOCK))
+            {
+                if (++fast > fast_size)
+                {
+                    fast = 0;
+
+                    if (++slow >= slow_limit)
+                    {
+                        break;
+                    }
+                    else
+                    {
+                        sched_yield()
+                    }
+                }
+            }
+            else
+            {
+                break;
+            }
+        }
 
         if (n == -1)
         {
             MXS_ERROR("Failed to write message: %d, %s", errno, mxs_strerror(errno));
+
+            static bool warn_pipe_buffer_size = true;
+
+            if ((errno == EAGAIN || errno == EWOULDBLOCK) && warn_pipe_buffer_size)
+            {
+                MXS_ERROR("Consider increasing pipe buffer size (sysctl fs.pipe-max-size)");
+                warn_pipe_buffer_size = false;
+            }
         }
     }
     else

server/inih/ini.c

@@ -17,8 +17,8 @@ http://code.google.com/p/inih/
 #include <stdlib.h>
 #endif
 
-#define MAX_SECTION 50
-#define MAX_NAME 50
+#define MAX_SECTION 1024
+#define MAX_NAME 1024
 
 /* Strip whitespace chars off end of given string, in place. Return s. */
 static char* rstrip(char* s)