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Cluster: log when a master denies a failover auth.

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This commit is contained in:
antirez 2014-06-10 16:07:26 +02:00
parent 64e6d7af47
commit 8204ab0098
1 changed files with 44 additions and 3 deletions
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47
src/cluster.c
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@ -2288,22 +2288,57 @@ void clusterSendFailoverAuthIfNeeded(clusterNode *node, clusterMsg *request) {
if (nodeIsSlave(myself) || myself->numslots == 0) return;
/* Request epoch must be >= our currentEpoch. */
if (requestCurrentEpoch < server.cluster->currentEpoch) return;
if (requestCurrentEpoch < server.cluster->currentEpoch) {
redisLog(REDIS_WARNING,
"Failover auth denied to %.40s: reqEpoch (%llu) < curEpoch(%llu)",
node->name,
(unsigned long long) requestCurrentEpoch,
(unsigned long long) server.cluster->currentEpoch);
return;
}
/* I already voted for this epoch? Return ASAP. */
if (server.cluster->lastVoteEpoch == server.cluster->currentEpoch) return;
if (server.cluster->lastVoteEpoch == server.cluster->currentEpoch) {
redisLog(REDIS_WARNING,
"Failover auth denied to %.40s: already voted for epoch %llu",
node->name,
(unsigned long long) server.cluster->currentEpoch);
return;
}
/* Node must be a slave and its master down.
* The master can be non failing if the request is flagged
* with CLUSTERMSG_FLAG0_FORCEACK (manual failover). */
if (nodeIsMaster(node) || master == NULL ||
(!nodeFailed(master) && !force_ack)) return;
(!nodeFailed(master) && !force_ack))
{
if (nodeIsMaster(node)) {
redisLog(REDIS_WARNING,
"Failover auth denied to %.40s: it is a master node",
node->name);
} else if (master == NULL) {
redisLog(REDIS_WARNING,
"Failover auth denied to %.40s: I don't know its master",
node->name);
} else if (!nodeFailed(master)) {
redisLog(REDIS_WARNING,
"Failover auth denied to %.40s: its master is up",
node->name);
}
return;
}
/* We did not voted for a slave about this master for two
* times the node timeout. This is not strictly needed for correctness
* of the algorithm but makes the base case more linear. */
if (mstime() - node->slaveof->voted_time < server.cluster_node_timeout * 2)
{
redisLog(REDIS_WARNING,
"Failover auth denied to %.40s: already voted for epoch %llu",
node->name,
(unsigned long long) server.cluster->currentEpoch);
return;
}
/* The slave requesting the vote must have a configEpoch for the claimed
* slots that is >= the one of the masters currently serving the same
@ -2318,6 +2353,12 @@ void clusterSendFailoverAuthIfNeeded(clusterNode *node, clusterMsg *request) {
/* If we reached this point we found a slot that in our current slots
* is served by a master with a greater configEpoch than the one claimed
* by the slave requesting our vote. Refuse to vote for this slave. */
redisLog(REDIS_WARNING,
"Failover auth denied to %.40s: "
"slot %d epoch (%llu) > reqEpoch (%llu)",
node->name, j,
(unsigned long long) server.cluster->slots[j]->configEpoch,
(unsigned long long) requestConfigEpoch);
return;
}