[Tarantool-patches] [PATCH v2 0/6] make clear_synchro_queue commit everything

[Serge Petrenko <sergepetrenko@tarantool.org>]

Changes in v2:
  - implement something similar to relay_lsn_watcher with the help of triggers.
  - fix election_qsync_stress test hang. One issue with the test itself and one
    issue with the txn_limbo.
  - various minor fixes.
  - change clear_synchro_queue behaviour: wait for quorum for
    replication_synchro_timeout. If the quorum isn't reached, rollback nothing,
    and warn the user.

@ChangeLog
  - Change `box.ctl.clear_synchro_queue` behaviour. Now it tries to commit
    everything that is present on the node. In order to do so it waits for other
    instances to replicate the data for `replication_synchro_quorum` seconds.
    In case timeout passes and quorum wasn't reached, nothing is rolled back (gh-5435)


Serge Petrenko (6):
  box: add a single execution guard to clear_synchro_queue
  relay: introduce on_status_update trigger
  txn_limbo: introduce txn_limbo_last_synchro_entry method
  box: rework clear_synchro_queue to commit everything
  test: fix replication/election_qsync_stress test
  txn_limbo: ignore CONFIRM/ROLLBACK for a foreign master

 src/box/applier.cc                            |   3 +-
 src/box/box.cc                                | 170 +++++++++++++++---
 src/box/box.h                                 |   2 +-
 src/box/lua/ctl.c                             |   4 +-
 src/box/raft.c                                |   9 +-
 src/box/relay.cc                              |  12 ++
 src/box/relay.h                               |   4 +
 src/box/txn_limbo.c                           |  26 ++-
 src/box/txn_limbo.h                           |   9 +-
 test/replication/election_qsync_stress.result |   7 +-
 .../election_qsync_stress.test.lua            |   7 +-
 test/replication/election_replica.lua         |   5 +-
 ...5435-clear-synchro-queue-commit-all.result | 144 +++++++++++++++
 ...35-clear-synchro-queue-commit-all.test.lua |  65 +++++++
 test/replication/suite.cfg                    |   1 +
 15 files changed, 423 insertions(+), 45 deletions(-)
 create mode 100644 test/replication/gh-5435-clear-synchro-queue-commit-all.result
 create mode 100644 test/replication/gh-5435-clear-synchro-queue-commit-all.test.lua

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