[Tarantool-patches] [PATCH v2 00/11] dRaft

[Vladislav Shpilevoy]

Raft leader election implementation. This version of the patchset passes the
existing tests, since Raft is disabled by default. New tests were not added yet.

Changes in v2:
- The patch about setting applier->instance_id is reworked completely;
- Found and attempted to fix a blocking issue 5827 about replicas too early
  registration;
- Fixed lots of bugs in Raft code found by sanity checks in a console.

Branch: http://github.com/tarantool/tarantool/tree/gh-1146-raft
Issue: https://github.com/tarantool/tarantool/issues/1146

Blocking issue: https://github.com/tarantool/tarantool/issues/5287

Vladislav Shpilevoy (10):
  applier: store instance_id in struct applier
  box: introduce summary RO flag
  wal: don't touch box.cfg.wal_dir more than once
  replication: track registered replica count
  [wip] box: do not register outgoing connections
  raft: introduce persistent raft state
  raft: introduce box.cfg.raft_* options
  raft: introduce state machine
  raft: introduce box.info.raft
  [tosquash] raft: a swarm of minor fixes

sergepetrenko (1):
  raft: relay status updates to followers

 src/box/CMakeLists.txt          |   1 +
 src/box/applier.cc              |  47 +-
 src/box/applier.h               |   2 +
 src/box/box.cc                  | 185 +++++--
 src/box/box.h                   |   9 +
 src/box/iproto_constants.h      |  15 +
 src/box/lua/cfg.cc              |  27 +
 src/box/lua/info.c              |  17 +
 src/box/lua/load_cfg.lua        |  15 +
 src/box/lua/misc.cc             |   1 +
 src/box/memtx_engine.c          |  36 ++
 src/box/raft.c                  | 852 ++++++++++++++++++++++++++++++++
 src/box/raft.h                  | 252 ++++++++++
 src/box/relay.cc                |  93 +++-
 src/box/relay.h                 |   7 +
 src/box/replication.cc          |  10 +-
 src/box/replication.h           |   7 +
 src/box/wal.c                   |   6 +
 src/box/wal.h                   |   7 +
 src/box/xrow.c                  | 113 +++++
 src/box/xrow.h                  |  15 +
 test/app-tap/init_script.result |   3 +
 test/box/admin.result           |   6 +
 test/box/cfg.result             |  12 +
 test/box/info.result            |   1 +
 25 files changed, 1695 insertions(+), 44 deletions(-)
 create mode 100644 src/box/raft.c
 create mode 100644 src/box/raft.h

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