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Sentinel: Redis-side support for slave priority.

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A Redis slave can now be configured with a priority, that is an integer
number that is shown in INFO output and can be get and set using the
redis.conf file or the CONFIG GET/SET command.

This field is used by Sentinel during slave election. A slave with lower
priority is preferred. A slave with priority zero is never elected (and
is considered to be impossible to elect even if it is the only slave
available).

A next commit will add support in the Sentinel side as well.
This commit is contained in:
antirez
2012-08-28 17:20:26 +02:00
parent c14e0ecafd
commit 169a44cbd6
3 changed files with 12 additions and 2 deletions
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7
src/config.c
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@ -354,6 +354,8 @@ void loadServerConfigFromString(char *config) {
if ((server.stop_writes_on_bgsave_err = yesnotoi(argv[1])) == -1) {
err = "argument must be 'yes' or 'no'"; goto loaderr;
}
} else if (!strcasecmp(argv[0],"slave-priority") && argc == 2) {
server.slave_priority = atoi(argv[1]);
} else if (!strcasecmp(argv[0],"sentinel")) {
/* argc == 1 is handled by main() as we need to enter the sentinel
* mode ASAP. */
@ -666,6 +668,10 @@ void configSetCommand(redisClient *c) {
if (yn == -1) goto badfmt;
server.rdb_checksum = yn;
} else if (!strcasecmp(c->argv[2]->ptr,"slave-priority")) {
if (getLongLongFromObject(o,&ll) == REDIS_ERR ||
ll <= 0) goto badfmt;
server.slave_priority = ll;
} else {
addReplyErrorFormat(c,"Unsupported CONFIG parameter: %s",
(char*)c->argv[2]->ptr);
@ -755,6 +761,7 @@ void configGetCommand(redisClient *c) {
config_get_numerical_field("repl-timeout",server.repl_timeout);
config_get_numerical_field("maxclients",server.maxclients);
config_get_numerical_field("watchdog-period",server.watchdog_period);
config_get_numerical_field("slave-priority",server.slave_priority);
/* Bool (yes/no) values */
config_get_bool_field("no-appendfsync-on-rewrite",