Merge branch '2.3' into 2.4

system-test/slave_failover.cpp

@@ -0,0 +1,67 @@
+/**
+ * @file slave_failover.cpp  Check how Maxscale works in case of one slave failure, only one slave is
+ * configured
+ *
+ * - Connect to RWSplit
+ * - find which backend slave is used for connection
+ * - blocm mariadb on the slave with firewall
+ * - wait 60 seconds
+ * - check which slave is used for connection now, expecting any other slave
+ * - check warning in the error log about broken slave
+ * - unblock mariadb backend (restore slave firewall settings)
+ * - check if Maxscale still alive
+ */
+
+
+#include <maxtest/testconnections.hh>
+
+int main(int argc, char* argv[])
+{
+    TestConnections test(argc, argv);
+
+    test.set_timeout(60);
+    test.repl->connect();
+    auto ids = test.repl->get_all_server_ids();
+    test.repl->disconnect();
+
+    auto conn = test.maxscales->rwsplit();
+    test.expect(conn.connect(), "Connection to rwsplit should work: %s", conn.error());
+
+    auto first_slave = conn.field("SELECT @@server_id");
+    conn.disconnect();
+
+    test.expect(!first_slave.empty(), "Result should not be empty");
+    int slave = std::stoi(first_slave);
+    test.expect(slave != ids[0], "The result should not be from the master");
+
+    test.set_timeout(60);
+    for (int i = 1; i < test.repl->N; i++)
+    {
+        if (ids[i] == slave)
+        {
+            test.repl->block_node(i);
+            test.maxscales->wait_for_monitor();
+            break;
+        }
+    }
+
+    test.set_timeout(60);
+    test.expect(conn.connect(), "Connection to rwsplit should work: %s", conn.error());
+    auto second_slave = conn.field("SELECT @@server_id");
+
+    test.expect(!second_slave.empty(), "Second result should not be empty");
+    test.expect(first_slave != second_slave, "The slave should change");
+    slave = std::stoi(second_slave);
+    test.expect(slave != ids[0], "The result should not be from the master");
+
+    for (int i = 1; i < test.repl->N; i++)
+    {
+        if (ids[i] == slave)
+        {
+            test.repl->unblock_node(i);
+            break;
+        }
+    }
+
+    return test.global_result;
+}