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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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27
src/replication.c
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@ -1386,6 +1386,30 @@ void replicationResurrectCachedMaster(int newfd) {
}
}
/* ------------------------- MIN-SLAVES-TO-WRITE --------------------------- */
/* This function counts the number of slaves with lag <= min-slaves-max-lag.
* If the option is active, the server will prevent writes if there are not
* enough connected slaves with the specified lag (or less). */
void refreshGoodSlavesCount(void) {
listIter li;
listNode *ln;
int good = 0;
if (!server.repl_min_slaves_to_write ||
!server.repl_min_slaves_max_lag) return;
listRewind(server.slaves,&li);
while((ln = listNext(&li))) {
redisClient *slave = ln->value;
time_t lag = server.unixtime - slave->repl_ack_time;
if (slave->replstate == REDIS_REPL_ONLINE &&
lag <= server.repl_min_slaves_max_lag) good++;
}
server.repl_good_slaves_count = good;
}
/* --------------------------- REPLICATION CRON ---------------------------- */
/* Replication cron funciton, called 1 time per second. */
@ -1499,4 +1523,7 @@ void replicationCron(void) {
(int) server.repl_backlog_time_limit);
}
}
/* Refresh the number of slaves with lag <= min-slaves-max-lag. */
refreshGoodSlavesCount();
}