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Cluster: added function to broadcast pings.

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See the function top-comment for info why this is useful sometimes.
This commit is contained in:
antirez 2013-03-15 15:43:53 +01:00
parent 892e98548a
commit bf82195467
1 changed files with 21 additions and 0 deletions
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21
src/cluster.c
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@ -1193,6 +1193,27 @@ void clusterSendPing(clusterLink *link, int type) {
clusterSendMessage(link,buf,totlen); clusterSendMessage(link,buf,totlen);
} }
/* Send a PING packet to every connected node that's not in handshake state.
*
* Usually cluster nodes will ping just another node every second, however
* in Redis Cluster pings are not just used for failure detection, but also
* to carry important configuration informations. So broadcasting a ping is
* useful when something changes in the configuration and we want to make
* the cluster aware ASAP (for instance after a slave promotion). */
void clusterBroadcastPing(void) {
dictIterator *di;
dictEntry *de;
di = dictGetIterator(server.cluster->nodes);
while((de = dictNext(di)) != NULL) {
clusterNode *node = dictGetVal(de);
if (node->flags & (REDIS_NODE_MYSELF|REDIS_NODE_HANDSHAKE)) continue;
clusterSendPing(node->link,CLUSTERMSG_TYPE_PONG);
}
dictReleaseIterator(di);
}
/* Send a PUBLISH message. /* Send a PUBLISH message.
* *
* If link is NULL, then the message is broadcasted to the whole cluster. */ * If link is NULL, then the message is broadcasted to the whole cluster. */