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Cluster: function clusterGetSlaveRank() added.

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Return the number of slaves for the same master having a better
replication offset of the current slave, that is, the slave "rank" used
to pick a delay before the request for election.
This commit is contained in:
antirez
2014-01-29 16:39:04 +01:00
parent 40cd38f0c4
commit 6f54032080
3 changed files with 52 additions and 9 deletions
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20
src/replication.c
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@ -1672,6 +1672,26 @@ void processClientsWaitingReplicas(void) {
}
}
/* Return the slave replication offset for this instance, that is
* the offset for which we already processed the master replication stream. */
long long replicationGetSlaveOffset(void) {
long long offset = 0;
if (server.masterhost != NULL) {
if (server.master) {
offset = server.master->reploff;
} else if (server.cached_master) {
offset = server.cached_master->reploff;
}
}
/* offset may be -1 when the master does not support it at all, however
* this function is designed to return an offset that can express the
* amount of data processed by the master, so we return a positive
* integer. */
if (offset < 0) offset = 0;
return offset;
}
/* --------------------------- REPLICATION CRON ---------------------------- */
/* Replication cron funciton, called 1 time per second. */