[Tarantool-patches] [PATCH 0/9] raft: introduce manual elections and fix a bug with re-applying rolled back transactions

[Serge Petrenko via Tarantool-patches <tarantool-patches@dev.tarantool.org>]

Hey, guys, take a look please.
The patchset does not contain the tests yet, I've only tested it manually.
I will make a follow up with tests soon.

Cyrill, I remember our conversation regarding the first patch and bitfields. I
just haven't come up with a better alternative yet.

https://github.com/tarantool/tarantool/tree/sp/gh-5445-election-fixes
https://github.com/tarantool/tarantool/issues/5445
https://github.com/tarantool/tarantool/issues/3055

Serge Petrenko (9):
  wal: enrich row's meta information with sync replication flags
  xrow: introduce a PROMOTE entry
  box: actualise iproto_key_type array
  box: make clear_synchro_queue() write a PROMOTE entry instead of
    CONFIRM + ROLLBACK
  box: write PROMOTE even for empty limbo
  raft: keep track of greatest known term and filter replication sources
    based on that
  replication: introduce a new election mode: "manual"
  Support manual elections in `box.ctl.clear_synchro_queue()`
  box.ctl: rename clear_synchro_queue to promote

 changelogs/unreleased/box-ctl-promote.md      |   8 +
 ...very => qsync-multi-statement-recovery.md} |   0
 changelogs/unreleased/raft-promote.md         |   4 +
 src/box/applier.cc                            |  22 ++-
 src/box/box.cc                                | 166 ++++++++++++++----
 src/box/box.h                                 |   2 +-
 src/box/errcode.h                             |   3 +
 src/box/iproto_constants.c                    |  58 ++++++
 src/box/iproto_constants.h                    |  27 ++-
 src/box/journal.h                             |   2 +
 src/box/lua/ctl.c                             |   8 +-
 src/box/raft.c                                |  31 +++-
 src/box/raft.h                                |  20 +++
 src/box/txn.c                                 |   5 +
 src/box/txn_limbo.c                           |  79 +++++----
 src/box/txn_limbo.h                           |  10 +-
 src/box/wal.c                                 |  26 +--
 src/box/xrow.c                                |  43 +++--
 src/box/xrow.h                                |  54 +++++-
 src/lib/raft/raft.c                           |  13 +-
 src/lib/raft/raft.h                           |  32 +++-
 test/replication/election_basic.result        |   4 +-
 test/unit/raft_test_utils.c                   |   4 +-
 23 files changed, 501 insertions(+), 120 deletions(-)
 create mode 100644 changelogs/unreleased/box-ctl-promote.md
 rename changelogs/unreleased/{qsync-multi-statement-recovery => qsync-multi-statement-recovery.md} (100%)
 create mode 100644 changelogs/unreleased/raft-promote.md

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