Merge branch '2.3' into 2.4

system-test/crash_out_of_files.cpp

@@ -0,0 +1,52 @@
+/**
+ * @file crash_ot_of_files.cpp Tries to open to many connections, expect no crash
+ * - set global max_connections = 20
+ * - create load on RWSplit using big number of threads (e.g. 100)
+ * - check that no backends are disconnected with error ""refresh rate limit exceeded"
+ */
+
+#include <maxtest/big_load.hh>
+#include <maxtest/testconnections.hh>
+
+int main(int argc, char* argv[])
+{
+    TestConnections* Test = new TestConnections(argc, argv);
+
+    Test->set_timeout(20);
+    Test->repl->execute_query_all_nodes((char*) "set global max_connections = 20;");
+
+    long int i1, i2;
+    long int selects[256];
+    long int inserts[256];
+    long int new_selects[256];
+    long int new_inserts[256];
+
+    Test->tprintf("Start load\n");
+    Test->set_timeout(1200);
+    load(&new_inserts[0], &new_selects[0], &selects[0], &inserts[0], 100, Test, &i1, &i2, 0, false, false);
+
+    Test->tprintf("restoring nodes\n");
+    Test->set_timeout(60);
+    Test->repl->connect();
+
+    for (int i = 0; i < Test->repl->N; i++)
+    {
+        Test->tprintf("Trying to flush node %d\n", i);
+        Test->add_result(execute_query(Test->repl->nodes[i], (char*) "flush hosts;"),
+                         "node %i flush failed\n",
+                         i);
+        Test->tprintf("Trying to set max_connections for node %d\n", i);
+        Test->add_result(execute_query(Test->repl->nodes[i], (char*) "set global max_connections = 151;"),
+                         "set max_connections failed for node %d\n",
+                         i);
+    }
+
+    Test->repl->close_connections();
+    Test->stop_timeout();
+
+    Test->log_excludes(0, "Refresh rate limit exceeded");
+    Test->check_maxscale_alive(0);
+    int rval = Test->global_result;
+    delete Test;
+    return rval;
+}