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