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Added blr_check_heartbeat as task

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Added blr_check_heartbeat as task
This commit is contained in:
MassimilianoPinto
2015-08-17 12:29:59 +02:00
parent e65e2b3a84
commit 37fd6f54e9
2 changed files with 233 additions and 40 deletions
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133
server/modules/routing/binlog/blr_master.c
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@ -40,6 +40,7 @@
* when an error is encountered in BLRM_BINLOGDUMP state.
* Server error code and msg are reported via SHOW SLAVE STATUS
* 03/08/2015 Massimiliano Pinto Initial implementation of transaction safety
* 13/08/2015 Massimiliano Pinto Addition of heartbeat check
*
* @endverbatim
*/
@ -89,6 +90,8 @@ static char *blr_extract_column(GWBUF *buf, int col);
void blr_cache_response(ROUTER_INSTANCE *router, char *response, GWBUF *buf);
void poll_fake_write_event(DCB *dcb);
GWBUF *blr_read_events_from_pos(ROUTER_INSTANCE *router, unsigned long long pos, REP_HEADER *hdr);
static void blr_check_last_master_event(void *inst);
extern int blr_check_heartbeat(ROUTER_INSTANCE *router);
static int keepalive = 1;
/**
@ -638,9 +641,22 @@ char query[128];
router->service->dbref->server->port)));
break;
case BLRM_BINLOGDUMP:
{
char *name;
// Main body, we have received a binlog record from the master
blr_handle_binlog_record(router, buf);
// set heartbeat check task
if ((name = (char *)malloc(80)) != NULL)
{
sprintf(name, "%s heartbeat", router->service->name);
hktask_add(name, blr_check_last_master_event, router, router->heartbeat);
free(name);
}
break;
}
}
if (router->reconnect_pending)
@ -978,6 +994,14 @@ int n_bufs = -1, pn_bufs = -1;
free(router->m_errmsg);
router->m_errmsg = NULL;
router->stats.n_binlogs++;
router->lastEventReceived = hdr.event_type;
router->lastEventTimestamp = hdr.timestamp;
#ifdef SHOW_EVENTS
printf("blr: event type 0x%02x, flags 0x%04x, event size %d, event timestamp %lu\n", hdr.event_type, hdr.flags, hdr.event_size, hdr.timestamp);
#endif
spinlock_release(&router->lock);
/*
@ -1012,13 +1036,7 @@ int n_bufs = -1, pn_bufs = -1;
return;
}
}
router->stats.n_binlogs++;
router->lastEventReceived = hdr.event_type;
router->lastEventTimestamp = hdr.timestamp;
#ifdef SHOW_EVENTS
printf("blr: event type 0x%02x, flags 0x%04x, event size %d", hdr.event_type, hdr.flags, hdr.event_size);
#endif
/**
* Check for an open transaction, if the option is set
* Only complete transactions should be sent to sleves
@ -1118,6 +1136,7 @@ int n_bufs = -1, pn_bufs = -1;
router->binlog_name,
router->current_pos)));
router->stats.n_fakeevents++;
if (hdr.event_type == FORMAT_DESCRIPTION_EVENT)
{
uint8_t *new_fde;
@ -1162,7 +1181,9 @@ int n_bufs = -1, pn_bufs = -1;
"Binlog %s @ %d.",
router->binlog_name,
router->current_pos)));
router->stats.n_heartbeats++;
}
else if (hdr.flags != LOG_EVENT_ARTIFICIAL_F)
{
@ -1870,3 +1891,103 @@ int n;
return result;
}
/**
* Stop and start the master connection
*
* @param router The router instance
*/
void
blr_stop_start_master(ROUTER_INSTANCE *router) {
if (router->master) {
if (router->master->fd != -1 && router->master->state == DCB_STATE_POLLING) {
blr_master_close(router);
}
}
spinlock_acquire(&router->lock);
router->master_state = BLRM_SLAVE_STOPPED;
/* set last_safe_pos */
router->last_safe_pos = router->binlog_position;
/**
* Set router->prevbinlog to router->binlog_name
* The FDE event with current filename may arrive after STOP SLAVE is received
*/
if (strcmp(router->binlog_name, router->prevbinlog) != 0)
strncpy(router->prevbinlog, router->binlog_name, BINLOG_FNAMELEN);
if (router->client) {
if (router->client->fd != -1 && router->client->state == DCB_STATE_POLLING) {
dcb_close(router->client);
router->client = NULL;
}
}
/* Discard the queued residual data */
while (router->residual)
{
router->residual = gwbuf_consume(router->residual, GWBUF_LENGTH(router->residual));
}
router->residual = NULL;
/* Now it is safe to unleash other threads on this router instance */
router->reconnect_pending = 0;
router->active_logs = 0;
router->master_state = BLRM_UNCONNECTED;
spinlock_release(&router->lock);
blr_start_master(router);
}
/**
* The heartbeat check function called from the housekeeper.
* We can try a new master connection if current one is seen out of date
*
* @param router Current router instance
*/
static void
blr_check_last_master_event(void *inst) {
ROUTER_INSTANCE *router = (ROUTER_INSTANCE *)inst;
int master_check = 1;
int master_state = BLRM_UNCONNECTED;
char *name = NULL;
spinlock_acquire(&router->lock);
master_check = blr_check_heartbeat(router);
master_state = router->master_state;
spinlock_release(&router->lock);
if (!master_check) {
/*
* stop current master connection
* and try a new connection
*/
blr_stop_start_master(router);
}
if ( (!master_check) || (master_state != BLRM_BINLOGDUMP) ) {
/*
* Remove the task, it will be added again
* when master state is back to BLRM_BINLOGDUMP
* by blr_master_response()
*/
if ((name = (char *)malloc(80)) != NULL) {
sprintf(name, "%s heartbeat", router->service->name);
hktask_remove(name);
free(name);
}
}
}