[mrtracy]

Post author here

Sargun is correct, all of our replication is performed by Raft, which exists at a lower level than the content covered in this post. Every command executed against a cockroach key (i.e. "create write intent", "begin this transaction") is persisted to the Raft log before executing; Commands will not proceed if they are not confirmed by Raft. The outcome of all commands is deterministic, so this provides complete replication of all mutations to each key.

If you're interested, there's more information available in our primary design document: (https://github.com/cockroachdb/cockroach/blob/master/docs/de...)