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Cluster: update the node configEpoch when newer is detected.

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This commit is contained in:
antirez 2013-09-27 09:55:41 +02:00
parent 7c4b8f29e7
commit 026e63392e
1 changed files with 13 additions and 4 deletions
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17
src/cluster.c
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@ -914,14 +914,17 @@ int clusterProcessPacket(clusterLink *link) {
if (totlen != explen) return 1;
}
/* Check if the sender is known.
* If it is, update our currentEpoch to its epoch if greater than our. */
/* Check if the sender is a known node. */
sender = clusterLookupNode(hdr->sender);
if (sender && !(sender->flags & REDIS_NODE_HANDSHAKE)) {
/* Update our curretEpoch if we see a newer epoch in the cluster. */
senderCurrentEpoch = ntohu64(hdr->currentEpoch);
senderConfigEpoch = ntohu64(hdr->configEpoch);
if (senderCurrentEpoch > server.cluster->currentEpoch)
server.cluster->currentEpoch = senderCurrentEpoch;
/* Update the sender configEpoch if it is publishing a newer one. */
if (senderConfigEpoch > sender->configEpoch)
sender->configEpoch = senderConfigEpoch;
}
/* Process packets by type. */
@ -1999,8 +2002,14 @@ void clusterUpdateState(void) {
}
/* If we can't reach at least half the masters, change the cluster state
* as FAIL, as we are not even able to mark nodes as FAIL in this side
* of the netsplit because of lack of majority. */
* to FAIL, as we are not even able to mark nodes as FAIL in this side
* of the netsplit because of lack of majority.
*
* TODO: when this condition is entered, we should not undo it for some
* (small) time after the majority is reachable again, to make sure that
* other nodes have enough time to inform this node of a configuration change.
* Otherwise a client with an old routing table may write to this node
* and later it may turn into a slave losing the write. */
{
int needed_quorum = (server.cluster->size / 2) + 1;