[Tarantool-patches] [PATCH 0/6] Synchronous replication preparation

[Georgy Kirichenko <georgy@tarantool.org>]

This patchset contains 6 patches and includes some refactoring
and synchronous replication preparation.

First three patches provides coio, recovery and xstream
refactoring which got rid of exceptions. This makes 
corresponding facilities C-compliant and enables its usage
from a wal source.

Fourth patch fixes a rare vinyl error which manifests itself while
transactional recovery as there is no data change and vy_tx log
tends to be empty.

Fifth patch improves recovery journal making them able to track
recovery vclock. This enables the last patch which implements
transactional recovery (either local wal including hot-standby or
final join). Transactional recovery is essential in case of
synchronous replication because this both sources (wal and final
join stream) would contain written but not yet committed
transaction and we will be in duty to recognize it.

Branch:
https://github.com/tarantool/tarantool/tree/g.kirichenko/gh-980-preparation
Issue:
https://github.com/tarantool/tarantool/issues/980

Georgy Kirichenko (6):
  recovery: do not throw an error
  coio: do not htrow an exception
  xstream: get rid of an exception
  vinyl: do not insert vy_tx twice into writers list
  box: improve recovery journal
  recovery: follow transaction boundaries while recovery or join

 src/box/applier.cc                     | 140 ++++++++--------
 src/box/box.cc                         | 119 ++++++++++----
 src/box/recovery.cc                    |  87 ++++++----
 src/box/recovery.h                     |  14 +-
 src/box/relay.cc                       |  47 +++---
 src/box/vy_tx.c                        |   2 +-
 src/box/xrow_io.cc                     |  59 +++----
 src/box/xrow_io.h                      |  11 +-
 src/box/xstream.cc                     |   7 +-
 src/box/xstream.h                      |   2 +-
 src/lib/core/coio.cc                   | 212 +++++++++++++------------
 src/lib/core/coio.h                    |  13 +-
 src/lib/core/coio_buf.h                |   8 +
 test/xlog-py/big_lsn.result            |   4 +
 test/xlog-py/big_lsn.test.py           |  13 +-
 test/xlog-py/dup_key.result            |   8 +
 test/xlog-py/dup_key.test.py           |   7 +
 test/xlog/panic_on_broken_lsn.result   |   9 +-
 test/xlog/panic_on_broken_lsn.test.lua |   7 +-
 19 files changed, 449 insertions(+), 320 deletions(-)

-- 
2.24.0