[Tarantool-patches] [PATCH v4 0/2] relay: provide downstream lag information
Cyrill Gorcunov
gorcunov at gmail.com
Fri May 7 00:41:30 MSK 2021
Guys, take a look once time permit. Previous version is here
https://lists.tarantool.org/tarantool-patches/20210430153940.121271-1-gorcunov@gmail.com/
v4 (by Vlad):
- add a test case
- add docbot request
- dropped off xrow_encode_vclock_timed, we use opencoded assignment
for tm value when send ack
- struct awstat renamed to applier_wal_stat. Vlad I think this is
better name than "applier_lag" because this is statistics on WAL,
we simply track remote WAL propagation here, so more general name
is better for grep sake and for future extensions
- instead of passing applier structure we pass replica_id
- the real keeper of this statistics comes into "replica" structure
thus unbound of applier itself
- for synchro entries we pass a pointer to the applier_wal_stat instead
of using replica_id = 0 as a sign that we don't need to update statistics
for initial and final join cases
- to write and read statistics we provide wal_stat_update and wal_stat_ack
helpers to cover the case where single ACK spans several transactions
branch: gorcunov/gh-5447-relay-lag-4
issue: https://github.com/tarantool/tarantool/issues/5447
Cyrill Gorcunov (2):
applier: send transaction's first row WAL time in the applier_writer_f
relay: provide information about downstream lag
.../unreleased/gh-5447-downstream-lag.md | 6 ++
src/box/applier.cc | 92 +++++++++++++++---
src/box/applier.h | 14 +++
src/box/lua/info.c | 3 +
src/box/relay.cc | 18 ++++
src/box/relay.h | 6 ++
src/box/replication.cc | 3 +
src/box/replication.h | 4 +
.../replication/gh-5447-downstream-lag.result | 93 +++++++++++++++++++
.../gh-5447-downstream-lag.test.lua | 41 ++++++++
10 files changed, 267 insertions(+), 13 deletions(-)
create mode 100644 changelogs/unreleased/gh-5447-downstream-lag.md
create mode 100644 test/replication/gh-5447-downstream-lag.result
create mode 100644 test/replication/gh-5447-downstream-lag.test.lua
base-commit: 4500547d7a177c0b49bff35c922286b4f21c8719
--
2.30.2
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