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0bff96a611
Motivation: The user can bootstrap 3 different clusters and then connect them (#14448). When these clusters start gossiping, their token rings will be merged, but there will be 3 different group 0s in there. It results in a corrupted cluster. We need to prevent such situations from happening in clusters which don't use Raft-based topology. ------- Gossiper service sets its group0 id on startup if it is stored in `scylla_local` or sets it during joining group0. Send group0_id (if it is set) when the node tries to initiate the gossip round. When a node gets gossip_digest_syn it checks if its group0 id equals the local one and if not, the message is discarded. Fixes #14448 Performed manual tests with the following scenario: 1. setup a cluster of two nodes (one compiled with and one without this patch) 2. setup a new node 3. create a basic keyspace and table 4. execute simple select and insert queries Tested 4 scenarios: the seed node was with or without this patch, and the third node was with or without this patch. These tests didn't detect any errors. Closes #15004 * github.com:scylladb/scylladb: tests: raft: cluster of nodes with different group0 ids gossip: add group0_id attribute to gossip_digest_syn