Hello,
Sorry for asking a very basic question.
Does percona recommends using multicast for data replication?
And how do we use multicast on 3 nodes cluster, do i need to use the same multicast ip on all nodes? Or different multicast ip for each node?
Also should I use both gmcast.listen_addr=tcp://0.0.0.0:4567 and gmcast.mcast_addr=239.192.0.12 at the same time?
Hello,
Yes, same address needs to be used in that variable:
[url]http://galeracluster.com/documentation-webpages/galeraparameters.html#gmcast-mcast-addr[/url]
Multicast address is not an individual host IP address, but rather a group address. Many hosts can subscribe to that group and communicate via it. You can find more details: [url]IP multicast - Wikipedia
So, it may be pretty useful to minimize the network traffic when you have many cluster nodes. You will find good article on that here:
[url]https://www.percona.com/blog/2013/06/05/multicast-replication-in-percona-xtradb-cluster-pxc-and-galera/[/url]
You will still need regular TCP/IP for SST and IST though.