/**
 * @file bug471.cpp bug471 regression case ( Routing Hints route to server sometimes doesn't work )
 *
 * - try "select @@server_id; -- maxscale route to server server%d" (where %d - server number) and compares result
 * with "select @@server_id;" sent directly to backend node.
 * - do it 25 times.
 */

/*
Massimiliano 2014-08-06 13:27:05 UTC
I found using basic routing hints such as:

 select @@server_id; -- maxscale route to server server4
 select @@server_id; -- maxscale route to server server3
 select @@server_id; -- maxscale route to server server2

server3 is the current master

and server4 server_id is 4
server3 server_id is 3
server2 server_id is 2

sometimes I cannot get the expected results that are:

4
3
2


Sometimes I got:

2
3
2

or

4
3
4

In maxScale configuration 5 servers defined:

server1 is not monitored but listed in [RW Split Service]
server5 is always stopped



MaxScale configuration:

[gateway]
threads=4

[RW Split Service]
#Please note server1 is not monitored n MySQL Monitor section
type=service
router=readwritesplit
servers=server1,server2,server3,server5,server4
max_slave_connections=100%
max_slave_replication_lag=21
user=massi
passwd=massi
enable_root_user=0
filters=Hint

# Definition of the servers
[server1]
#not monitored
type=server
address=127.0.0.1
port=3306
protocol=MySQLBackend

[server2]
type=server
address=127.0.0.1
port=3307
protocol=MySQLBackend

[server3]
type=server
address=127.0.0.1
port=3308
protocol=MySQLBackend

[server4]
type=server
address=127.0.0.1
port=3309
protocol=MySQLBackend

[server5]
#always stopped
type=server
address=127.0.0.1
port=3310
protocol=MySQLBackend


[RW Split Listener]
type=listener
service=RW Split Service
protocol=MySQLClient
port=4606

[Hint]
type=filter
module=hintfilter

[MySQL Monitor]
# Please note server1 is not monitored
type=monitor
module=mysqlmon
servers=server4,server2,server3,server5
user=massi
passwd=massi
detect_replication_lag=1
monitor_interval=10001



Removing server1 from the service section gives right results for server_id selection



# mysql -c -h 127.0.0.1 -P 4606 -umassi -pmassi
MariaDB> select @@server_id; -- maxscale route to server server4



Please not -c option that allows comments to be sent


Vilho Raatikka 2014-08-08 08:13:42 UTC
After further consideration we decided that the behavior is invalid. Routing hints should be followed if they don't violate database consistency nor cluster setup.
Comment 11 Vilho Raatikka 2014-08-08 17:26:25 UTC
Pushed fix in commit d4de582e1622908cc95396f57878f8691289c35b to Z2.
Replication lag is not checked if routing hint is used.

*/



#include <iostream>
#include <unistd.h>
#include "testconnections.h"

using namespace std;

int main(int argc, char *argv[])
{
    TestConnections * Test = new TestConnections(argc, argv);
    Test->set_timeout(10);

    Test->repl->connect();
    Test->add_result(Test->maxscales->connect_maxscale(0), "Failed to connect to MaxScale\n");

    char server_id[256];
    char server_id_d[256];

    char hint_sql[64];

    for (int i = 1; i < 25; i++)
    {
        for (int j = 0; j < Test->repl->N; j++)
        {
            if (j != 1 )
            {
                Test->set_timeout(5);
                sprintf(hint_sql, "select @@server_id; -- maxscale route to server server%d", j + 1);

                find_field(Test->maxscales->conn_rwsplit[0], hint_sql, (char *) "@@server_id", &server_id[0]);
                find_field(Test->repl->nodes[j], (char *) "select @@server_id;", (char *) "@@server_id", &server_id_d[0]);

                Test->tprintf("server%d ID from Maxscale: \t%s\n", j + 1, server_id);
                Test->tprintf("server%d ID directly from node: \t%s\n", j + 1, server_id_d);

                Test->add_result(strcmp(server_id, server_id_d), "Hints does not work!\n");
            }
        }
    }

    Test->set_timeout(10);

    Test->maxscales->close_maxscale_connections(0);
    Test->repl->close_connections();

    Test->check_maxscale_alive(0);

    int rval = Test->global_result;
    delete Test;
    return rval;
}