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Add support for Galera xtrabackup donor availability

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This commit is contained in:
Guillaume Lefranc
2015-04-20 14:45:03 +02:00
parent bf83ce9db3
commit 060ebc3880
4 changed files with 49 additions and 3 deletions
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39
server/modules/monitor/galera_mon.c
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@ -32,6 +32,7 @@
* 24/06/14 Massimiliano Pinto Added depth level 0 for each node
* 30/10/14 Massimiliano Pinto Added disableMasterFailback feature
* 10/11/14 Massimiliano Pinto Added setNetworkTimeout for connect,read,write
* 20/05/15 Guillaume Lefranc Added availableWhenDonor feature
*
* @endverbatim
*/
@ -158,6 +159,7 @@ CONFIG_PARAMETER* params = (CONFIG_PARAMETER*)opt;
handle->id = MONITOR_DEFAULT_ID;
handle->interval = MONITOR_INTERVAL;
handle->disableMasterFailback = 0;
handle->availableWhenDonor = 0;
handle->master = NULL;
handle->connect_timeout=DEFAULT_CONNECT_TIMEOUT;
handle->read_timeout=DEFAULT_READ_TIMEOUT;
@ -170,6 +172,8 @@ 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"))
handle->availableWhenDonor = config_truth_value(params->value);
params = params->next;
}
@ -289,6 +293,7 @@ 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,"\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);
@ -428,14 +433,28 @@ char *server_string;
}
/* Check if the the Galera FSM shows this node is joined to the cluster */
if (mysql_query(database->con, "SHOW STATUS LIKE 'wsrep_local_state_comment'") == 0
if (mysql_query(database->con, "SHOW STATUS LIKE 'wsrep_local_state'") == 0
&& (result = mysql_store_result(database->con)) != NULL)
{
num_fields = mysql_num_fields(result);
while ((row = mysql_fetch_row(result)))
{
if (strncasecmp(row[1], "SYNCED", 3) == 0)
if (strcmp(row[1], "4") == 0)
isjoined = 1;
/* Check if the node is a donor and is using xtrabackup, in this case it can stay alive */
else if (strcmp(row[1], "2") == 0 && handle->availableWhenDonor == 1) {
if (mysql_query(database->con, "SHOW VARIABLES LIKE 'wsrep_sst_method'") == 0
&& (result = mysql_store_result(database->con)) != NULL)
{
num_fields = mysql_num_fields(result);
while ((row = mysql_fetch_row(result)))
{
if (strncmp(row[1], "xtrabackup", 10) == 0)
isjoined = 1;
}
}
}
}
mysql_free_result(result);
}
@ -732,6 +751,22 @@ MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg;
memcpy(&handle->disableMasterFailback, &disable, sizeof(int));
}
/**
* Allow a Galera node to be in sync when Donor.
*
* When enabled, the monitor will check if the node is using xtrabackup or xtrabackup-v2
* as SST method. In that case, node will stay as synced.
*
* @param arg The handle allocated by startMonitor
* @param disable To allow sync status use 1, 0 for traditional behavior
*/
static void
availableWhenDonor(void *arg, int disable)
{
MYSQL_MONITOR *handle = (MYSQL_MONITOR *)arg;
memcpy(&handle->availableWhenDonor, &disable, sizeof(int));
}
/**
* Set the timeouts to use in the monitor.
*