[Tarantool-patches] [PATCH 0/3] Raft on leader election recovery restart

[Vladislav Shpilevoy]

There were 2 issues with the relay restarting recovery cursor when the node is
elected as a leader. Fixed in the last 2 commits. First was about local LSN not
being set, second about GC not being propagated.

The first patch is not related to the bugs above directly. Just was found while
working on this. In theory without the first patch we can get flakiness into
the testes changed in this commit, but only if a replication connection will
break without a reason.

Additionally, the new test - gh-5433-election-restart-recovery - hangs on my
machine when I start tens of it. All workers, after executing it several times,
hang. But!!! not in something related to the raft - they hang in the first
box.snapshot(), where the election is not even enabled yet. From some debug
prints I see it hangs somewhere in engine_being_checkpoint(), and consumes
~80% of the CPU. But it may be just a consequence of the corrupted memory on
Mac, due to libeio being broken. Don't know what to do with that now.

Branch: http://github.com/tarantool/tarantool/tree/gerold103/gh-5433-raft-leader-recovery-restart
Issue: https://github.com/tarantool/tarantool/issues/5433

Vladislav Shpilevoy (3):
  raft: send state to new subscribers if Raft worked
  raft: use local LSN in relay recovery restart
  raft: don't drop GC when restart relay recovery

 src/box/box.cc                                |  14 +-
 src/box/raft.h                                |  10 +
 src/box/relay.cc                              |  22 ++-
 .../gh-5426-election-on-off.result            |  59 ++++--
 .../gh-5426-election-on-off.test.lua          |  26 ++-
 .../gh-5433-election-restart-recovery.result  | 174 ++++++++++++++++++
 ...gh-5433-election-restart-recovery.test.lua |  87 +++++++++
 test/replication/suite.cfg                    |   1 +
 8 files changed, 367 insertions(+), 26 deletions(-)
 create mode 100644 test/replication/gh-5433-election-restart-recovery.result
 create mode 100644 test/replication/gh-5433-election-restart-recovery.test.lua

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