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Modifications to galera monitor to control whether selection of master is wanted.

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This commit is contained in:
counterpoint
2015-04-24 15:35:10 +01:00
parent 8bc004db26
commit 03badb9b7b
7 changed files with 53 additions and 38 deletions
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31
server/modules/monitor/galera_mon.c
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@ -160,6 +160,7 @@ CONFIG_PARAMETER* params = (CONFIG_PARAMETER*)opt;
handle->interval = MONITOR_INTERVAL;
handle->disableMasterFailback = 0;
handle->availableWhenDonor = 0;
handle->disableMasterRoleSetting = 0;
handle->master = NULL;
handle->connect_timeout=DEFAULT_CONNECT_TIMEOUT;
handle->read_timeout=DEFAULT_READ_TIMEOUT;
@ -172,8 +173,10 @@ CONFIG_PARAMETER* params = (CONFIG_PARAMETER*)opt;
{
if(!strcmp(params->name,"disable_master_failback"))
handle->disableMasterFailback = config_truth_value(params->value);
if(!strcmp(params->name,"available_when_donor"))
else if(!strcmp(params->name,"available_when_donor"))
handle->availableWhenDonor = config_truth_value(params->value);
else if(!strcmp(params->name,"disable_master_role_setting"))
handle->disableMasterRoleSetting = config_truth_value(params->value);
params = params->next;
}
@ -294,6 +297,7 @@ char *sep;
dcb_printf(dcb,"\tSampling interval:\t%lu milliseconds\n", handle->interval);
dcb_printf(dcb,"\tMaster Failback:\t%s\n", (handle->disableMasterFailback == 1) ? "off" : "on");
dcb_printf(dcb,"\tAvailable when Donor:\t%s\n", (handle->availableWhenDonor == 1) ? "on" : "off");
dcb_printf(dcb,"\tMaster Role Setting Disabled:\t%s\n", (handle->disableMasterRoleSetting == 1) ? "on" : "off");
dcb_printf(dcb,"\tConnect Timeout:\t%i seconds\n", handle->connect_timeout);
dcb_printf(dcb,"\tRead Timeout:\t\t%i seconds\n", handle->read_timeout);
dcb_printf(dcb,"\tWrite Timeout:\t\t%i seconds\n", handle->write_timeout);
@ -596,40 +600,47 @@ int log_no_members = 1;
* Decision depends on master_stickiness value set in configuration
*/
/* get the candidate master, followinf MIN(node_id) rule */
/* get the candidate master, following MIN(node_id) rule */
candidate_master = get_candidate_master(handle->databases);
/* Select the master, based on master_stickiness */
handle->master = set_cluster_master(handle->master, candidate_master, master_stickiness);
if (1 == handle->disableMasterRoleSetting) {
handle->master = NULL;
}
else {
handle->master = set_cluster_master(handle->master, candidate_master, master_stickiness);
}
ptr = handle->databases;
while (ptr && handle->master) {
while (ptr) {
if (!SERVER_IS_JOINED(ptr->server) || SERVER_IN_MAINT(ptr->server)) {
ptr = ptr->next;
continue;
}
if (ptr != handle->master) {
if (handle->master) {
if (ptr != handle->master) {
/* set the Slave role */
server_set_status(ptr->server, SERVER_SLAVE);
server_clear_status(ptr->server, SERVER_MASTER);
/* clear master stickyness */
/* clear master stickiness */
server_clear_status(ptr->server, SERVER_MASTER_STICKINESS);
} else {
} else {
/* set the Master role */
server_set_status(handle->master->server, SERVER_MASTER);
server_clear_status(handle->master->server, SERVER_SLAVE);
if (candidate_master && handle->master->server->node_id != candidate_master->server->node_id) {
/* set master stickyness */
/* set master stickiness */
server_set_status(handle->master->server, SERVER_MASTER_STICKINESS);
} else {
/* clear master stickyness */
/* clear master stickiness */
server_clear_status(ptr->server, SERVER_MASTER_STICKINESS);
}
}
}
}
is_cluster++;