hcq/MaxScale
hcq/MaxScale
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

get_root_master routine available

Browse Source 
get_root_master routine available
This commit is contained in:
MassimilianoPinto 2014-06-25 17:19:14 +02:00
parent 2eafe15bca
commit 5a65bc2aaa
1 changed files with 51 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

86
server/modules/routing/readconnroute.c
View File

@ -322,41 +322,10 @@ BACKEND *master_host = NULL;
client_rses->rses_chk_tail = CHK_NUM_ROUTER_SES;
#endif
/********************************
* Get the root Master rule:
*
* 1) find server(s) with lowest replication depth level
* 2) check for SERVER_MASTER bitvalue in those servers
*
*/
/* 1) find root server(s) */
for (i = 0; inst->servers[i]; i++) {
if (inst->servers[i] && SERVER_IS_RUNNING(inst->servers[i]->server)) {
if (master_host && inst->servers[i]->server->depth < master_host->server->depth) {
master_host = inst->servers[i];
} else {
if (master_host == NULL) {
master_host = inst->servers[i];
}
}
}
}
/* 2) get the status of server(s) with lowest replication level and check it against SERVER_MASTER bitvalue */
if (master_host) {
int found = 0;
for (i = 0; inst->servers[i]; i++) {
if (inst->servers[i] && SERVER_IS_RUNNING(inst->servers[i]->server) && (inst->servers[i]->server->depth == master_host->server->depth)) {
if (inst->servers[i]->server->status & SERVER_MASTER) {
master_host = inst->servers[i];
found = 1;
}
}
}
if (!found)
master_host = NULL;
}
/**
* Find the Master host from available servers
*/
master_host = get_root_master(inst->servers);
/**
* Find a backend server to connect to. This is the extent of the
@ -833,3 +802,50 @@ static uint8_t getCapabilities(
{
return 0;
}
/********************************
* This routine return the root master server from MySQL replication tree
* Get the root Master rule:
*
* (1) find server(s) with lowest replication depth level
* (2) check for SERVER_MASTER bitvalue in those servers
*
* @param servers The list of servers
* @return The Master found
*
*/
static BACKEND *get_root_master(BACKEND **servers) {
int i = 0;
BACKEND * master_host = NULL;
/* (1) find root server(s) with lowest replication depth level */
for (i = 0; servers[i]; i++) {
if (servers[i] && SERVER_IS_RUNNING(servers[i]->server)) {
if (master_host && servers[i]->server->depth < master_host->server->depth) {
master_host = servers[i];
} else {
if (master_host == NULL) {
master_host = servers[i];
}
}
}
}
/* (2) get the status of server(s) with lowest replication level and check it against SERVER_MASTER bitvalue */
if (master_host) {
int found = 0;
for (i = 0; servers[i]; i++) {
if (servers[i] && SERVER_IS_RUNNING(servers[i]->server) && (servers[i]->server->depth == master_host->server->depth)) {
if (servers[i]->server->status & SERVER_MASTER) {
master_host = servers[i];
found = 1;
}
}
}
if (!found)
master_host = NULL;
}
return master_host;
}