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eadcb5f0f8
Zen2 nodes will bootstrap themselves once they believe there to be no remaining Zen1 master-eligible nodes in the cluster, as long as minimum_master_nodes is satisfied. Today the bootstrap configuration comprises just the ids of the known master-eligible nodes, and this might be too small to be safe. For instance, if there are 5 master-eligible nodes (so that minimum_master_nodes is 3) then the bootstrap configuration could comprise just 3 nodes, of which 2 form a quorum, and this does not intersect other quorums that might arise, leading to a split-brain. This commit fixes this by expanding the bootstrap configuration so that its quorums satisfy minimum_master_nodes, by adding some of the IDs of the other master-eligible nodes in the last-published cluster state.