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min-slaves-to-write: don't accept writes with less than N replicas.

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This feature allows the user to specify the minimum number of
connected replicas having a lag less or equal than the specified
amount of seconds for writes to be accepted.
This commit is contained in:
antirez
2013-05-29 11:36:44 +02:00
parent fc2587ec6e
commit d0d67f8d42
6 changed files with 77 additions and 2 deletions
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15
src/redis.c
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@ -1125,6 +1125,8 @@ void createSharedObjects(void) {
"-OOM command not allowed when used memory > 'maxmemory'.\r\n"));
shared.execaborterr = createObject(REDIS_STRING,sdsnew(
"-EXECABORT Transaction discarded because of previous errors.\r\n"));
shared.noreplicaserr = createObject(REDIS_STRING,sdsnew(
"-NOREPLICAS Not enough good slaves to write.\r\n"));
shared.space = createObject(REDIS_STRING,sdsnew(" "));
shared.colon = createObject(REDIS_STRING,sdsnew(":"));
shared.plus = createObject(REDIS_STRING,sdsnew("+"));
@ -1228,6 +1230,8 @@ void initServerConfig() {
server.shutdown_asap = 0;
server.repl_ping_slave_period = REDIS_REPL_PING_SLAVE_PERIOD;
server.repl_timeout = REDIS_REPL_TIMEOUT;
server.repl_min_slaves_to_write = REDIS_DEFAULT_MIN_SLAVES_TO_WRITE;
server.repl_min_slaves_max_lag = REDIS_DEFAULT_MIN_SLAVES_MAX_LAG;
server.lua_caller = NULL;
server.lua_time_limit = REDIS_LUA_TIME_LIMIT;
server.lua_client = NULL;
@ -1429,6 +1433,7 @@ void initServer() {
server.ops_sec_last_sample_ops = 0;
server.unixtime = time(NULL);
server.lastbgsave_status = REDIS_OK;
server.repl_good_slaves_count = 0;
if(aeCreateTimeEvent(server.el, 1, serverCron, NULL, NULL) == AE_ERR) {
redisPanic("Can't create the serverCron time event.");
exit(1);
@ -1733,6 +1738,16 @@ int processCommand(redisClient *c) {
return REDIS_OK;
}
/* Don't accept write commands if there are not enough good slaves and
* used configured the min-slaves-to-write option. */
if (server.repl_min_slaves_to_write && server.repl_min_slaves_max_lag &&
server.repl_good_slaves_count < server.repl_min_slaves_to_write)
{
flagTransaction(c);
addReply(c, shared.noreplicaserr);
return REDIS_OK;
}
/* Don't accept write commands if this is a read only slave. But
* accept write commands if this is our master. */
if (server.masterhost && server.repl_slave_ro &&