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scylladb/test
Tomasz Grabiec 7719f4cd91 Merge "Group 0 discovery: persist and restore peers" from Kamil
We add a `peers()` method to `discovery` which returns the peers
discovered until now (including seeds). The caller of functions which
return an output -- `tick` or `request` -- is responsible for persisting
`peers()` before returning the output of `tick`/`request` (e.g. before
sending the response produced by `request` back). The user of
`discovery` is also responsible for restoring previously persisted peers
when constructing `discovery` again after a restart (e.g. if we
previously crashed in the middle of the algorithm).

The `persistent_discovery` class is a wrapper around `discovery` which
does exactly that.

For storage we use a simple local table.

A simple bugfix is also included in the first patch.

* kbr/discovery-persist-v3:
  service: raft: raft_group0: persist discovered peers and restore on restart
  db: system_keyspace: introduce discovery table
  service: raft: discovery: rename `get_output` to `tick`
  service: raft: discovery: stop returning peer_list from `request` after becoming leader
2022-02-25 17:23:08 +01:00
..