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b912eeade5
Since most group0 commands are just mutations it is easy to combine them before passing them to a subsystem they destined to since it is more efficient. The logic that handles those mutations in a subsystem will run once for each batch of commands instead of for each individual command. This is especially useful when a node catches up to a leader and gets a lot of commands together. The patch here does exactly that. It combines commands into a single command if possible, but it preserves an order between commands, so each time it encounters a command to a different subsystem it flushes already combined batch and starts a new one. This extra safety assumes that there are dependencies between subsystems managed by group0, so the order matters. It may be not the case now, but we prefer to be on a safe side. Broadcast table commands are not mutations, so they are never combined. * 'raft-merge-cmds' of https://github.com/gleb-cloudius/scylla: test: add test for group0 raft command merging service: raft: respect max mutation size limit when persisting raft entries group0_state_machine: merge commands before applying them whenever possible