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I have 2 datacenters, each DC has MGT, SQL and Data nodes.
How will MySQL NDB Cluster work if there are network problems between 2 DC?
In this case 2 DC will work well, but they don't know anything about other node.
Who ll be the main and who ll be the reserve, how will they decide it?
Is there a quorum server for MySQL Cluster?
It will be decided by an arbitrator node which is normally a MGM node. It would be advisable to put this arbitrator node in a 3rd DC.
In the case of 2 DCs the DC where the arbitrator resides will survive if the network between the DCs is broken. With a 3rd DC with the arbitrator node, the one to first ask for arbitration will fail.
