Add test for ALTER TABLE with avrorouter

The test does a set of ALTER TABLE operations and checks that MaxScale
outputs the correct data.

maxscale-system-test/CMakeLists.txt

@@ -608,6 +608,7 @@ add_test_executable(test_hints.cpp test_hints hints2 LABELS hintfilter LIGHT REP
 
 # Binlogrouter tests, these heavily alter the replication so they are run last
 add_test_executable(avro.cpp avro avro LABELS avrorouter binlogrouter LIGHT BREAKS_REPL)
+add_test_executable(avro_alter.cpp avro_alter avro LABELS avrorouter binlogrouter LIGHT BREAKS_REPL)
 
 # Test avrorouter file compression
 #add_test_script(avro_compression avro avro_compression LABELS avrorouter binlogrouter LIGHT BREAKS_REPL)

maxscale-system-test/avro_alter.cpp

@@ -0,0 +1,57 @@
+/**
+ * @file avro_alter.cpp Test ALTER TABLE handling of avrorouter
+ */
+
+#include "testconnections.h"
+#include <sstream>
+
+int main(int argc, char *argv[])
+{
+
+    TestConnections test(argc, argv);
+    test.set_timeout(600);
+    test.ssh_maxscale(true, (char *) "rm -rf /var/lib/maxscale/avro");
+
+    /** Start master to binlogrouter replication */
+    if (!test.replicate_from_master())
+    {
+        return 1;
+    }
+
+    test.set_timeout(120);
+    test.repl->connect();
+
+    execute_query_silent(test.repl->nodes[0], "DROP TABLE test.t1");
+    execute_query(test.repl->nodes[0], "CREATE TABLE test.t1(id INT)");
+    execute_query(test.repl->nodes[0], "INSERT INTO test.t1 VALUES (1)");
+    execute_query(test.repl->nodes[0], "ALTER TABLE test.t1 ADD COLUMN a VARCHAR(100)");
+    execute_query(test.repl->nodes[0], "INSERT INTO test.t1 VALUES (2, \"a\")");
+    execute_query(test.repl->nodes[0], "ALTER TABLE test.t1 ADD COLUMN b FLOAT");
+    execute_query(test.repl->nodes[0], "INSERT INTO test.t1 VALUES (3, \"b\", 3.0)");
+    execute_query(test.repl->nodes[0], "ALTER TABLE test.t1 CHANGE COLUMN b c DATETIME(3)");
+    execute_query(test.repl->nodes[0], "INSERT INTO test.t1 VALUES (4, \"c\", NOW())");
+    execute_query(test.repl->nodes[0], "ALTER TABLE test.t1 DROP COLUMN c");
+    execute_query(test.repl->nodes[0], "INSERT INTO test.t1 VALUES (5, \"d\")");
+
+    test.repl->close_connections();
+
+    /** Give avrorouter some time to process the events */
+    test.stop_timeout();
+    sleep(10);
+    test.set_timeout(120);
+
+    for (int i = 1; i <=5; i++)
+    {
+        std::stringstream cmd;
+        cmd << "maxavrocheck -d /var/lib/maxscale/avro/test.t1.00000" << i << ".avro|wc -l";
+        char* rows = test.ssh_maxscale_output(true, cmd.str().c_str());
+        int nrows = atoi(rows);
+        free(rows);
+        test.add_result(nrows != 1, "Expected 1 line in file number %d, got %d", i, nrows);
+    }
+
+    execute_query(test.repl->nodes[0], "DROP TABLE test.t1;RESET MASTER");
+    test.repl->fix_replication();
+
+    return test.global_result;
+}

maxscale-system-test/mariadb_nodes.cpp

@@ -432,6 +432,7 @@ int Mariadb_nodes::start_replication()
                 "mysql -u root %s -e \"STOP SLAVE; RESET SLAVE; RESET SLAVE ALL; RESET MASTER; SET GLOBAL read_only=OFF;\"",
                 socket_cmd[i]);
         ssh_node(i, str, true);
+        ssh_node(i, "sudo rm -f /etc/my.cnf.d/kerb.cnf", true);
     }
 
     sprintf(str, "%s/create_user.sh", test_dir);