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Sentinel: new failover algo, desync slaves and update config epoch.

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This commit is contained in:
antirez 2013-11-12 17:07:31 +01:00
parent 4a128b949d
commit d2bc6dc39a
1 changed files with 21 additions and 1 deletions

22
src/sentinel.c

@ -1509,6 +1509,12 @@ void sentinelRefreshInstanceInfo(sentinelRedisInstance *ri, const char *info) {
(ri->master->failover_state == (ri->master->failover_state ==
SENTINEL_FAILOVER_STATE_WAIT_PROMOTION)) SENTINEL_FAILOVER_STATE_WAIT_PROMOTION))
{ {
/* Now that we are sure the slave was reconfigured as a master
* set the master configuration epoch to the epoch we won the
* election to perform this failover. This will force the other
* Sentinels to update their config (assuming there is not
* a newer one already available). */
ri->master->config_epoch = ri->master->failover_epoch;
ri->master->failover_state = SENTINEL_FAILOVER_STATE_RECONF_SLAVES; ri->master->failover_state = SENTINEL_FAILOVER_STATE_RECONF_SLAVES;
ri->master->failover_state_change_time = mstime(); ri->master->failover_state_change_time = mstime();
sentinelEvent(REDIS_WARNING,"+promoted-slave",ri,"%@"); sentinelEvent(REDIS_WARNING,"+promoted-slave",ri,"%@");
@ -2417,6 +2423,13 @@ char *sentinelVoteLeader(sentinelRedisInstance *master, uint64_t req_epoch, char
master->leader_epoch = sentinel.current_epoch; master->leader_epoch = sentinel.current_epoch;
sentinelEvent(REDIS_WARNING,"+vote-for-leader",master,"%s %llu", sentinelEvent(REDIS_WARNING,"+vote-for-leader",master,"%s %llu",
master->leader, (unsigned long long) master->leader_epoch); master->leader, (unsigned long long) master->leader_epoch);
/* If we did not voted for ourselves, set the master failover start
* time to now, in order to force a delay before we can start a
* failover for the same master.
*
* The random addition is useful to desynchronize a bit the slaves
* and reduce the chance that no slave gets majority. */
master->failover_start_time = mstime() + rand() % 2000;
} }
*leader_epoch = master->leader_epoch; *leader_epoch = master->leader_epoch;
@ -2671,7 +2684,14 @@ void sentinelFailoverWaitStart(sentinelRedisInstance *ri) {
sdsfree(leader); sdsfree(leader);
/* If I'm not the leader, I can't continue with the failover. */ /* If I'm not the leader, I can't continue with the failover. */
if (!isleader) return; if (!isleader) {
/* Abort the failover if I'm not the leader after some time. */
if (mstime() - ri->failover_start_time > 10000) {
sentinelEvent(REDIS_WARNING,"-failover-abort-not-elected",ri,"%@");
sentinelAbortFailover(ri);
}
return;
}
sentinelEvent(REDIS_WARNING,"+elected-leader",ri,"%@"); sentinelEvent(REDIS_WARNING,"+elected-leader",ri,"%@");
/* Start the failover going to the next state if enough time has /* Start the failover going to the next state if enough time has