From: Vitaliia Ioffe via Tarantool-patches <tarantool-patches@dev.tarantool.org>
To: "Serge Petrenko" <sergepetrenko@tarantool.org>
Cc: tarantool-patches@dev.tarantool.org
Subject: Re: [Tarantool-patches] [PATCH] applier: fix upstream.lag calculations
Date: Sat, 14 Aug 2021 09:42:53 +0300 [thread overview]
Message-ID: <1628923373.481086215@f108.i.mail.ru> (raw)
In-Reply-To: <20210813142546.41696-1-sergepetrenko@tarantool.org>
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Hi Sergey,
I’m so sorry for saying it: but this fix is not a fix. I have to underline there were failed tests:
[037] replication/errinj.test.lua memtx [ fail ]
[037] replication/errinj.test.lua vinyl [ fail ]
You can find it here:
https://github.com/tarantool/tarantool/runs/3322606890
--
Vitaliia Ioffe
>Пятница, 13 августа 2021, 17:25 +03:00 от Serge Petrenko <sergepetrenko@tarantool.org>:
>
>upstream.lag is the delta between the moment when a row was written to
>master's journal and the moment when it was received by the replica.
>It's an important metric to check whether the replica has fallen too far
>behind master.
>
>Not all the rows coming from master have a valid time of creation. For
>example, RAFT system messages don't have one, and we can't assign
>correct time to them: these messages do not originate from the journal,
>and assigning current time to them would lead to jumps in upstream.lag
>results.
>
>Stop updating upstream.lag for rows which don't have creation time
>assigned.
>
>This also fixes the flaky replication/errinj.test.lua
>---
>https://github.com/tarantool/tarantool/tree/sp/applier-lag-fix
>
> src/box/applier.cc | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
>diff --git a/src/box/applier.cc b/src/box/applier.cc
>index 902d0bc72..9256078e1 100644
>--- a/src/box/applier.cc
>+++ b/src/box/applier.cc
>@@ -664,7 +664,8 @@ applier_read_tx_row(struct applier *applier, double timeout)
>
> coio_read_xrow_timeout_xc(coio, ibuf, row, timeout);
>
>- applier->lag = ev_now(loop()) - row->tm;
>+ if (row->tm > 0)
>+ applier->lag = ev_now(loop()) - row->tm;
> applier->last_row_time = ev_monotonic_now(loop());
> return tx_row;
> }
>--
>2.30.1 (Apple Git-130)
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next prev parent reply other threads:[~2021-08-14 6:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-13 14:25 Serge Petrenko via Tarantool-patches
2021-08-14 6:42 ` Vitaliia Ioffe via Tarantool-patches [this message]
2021-08-14 8:03 ` Serge Petrenko via Tarantool-patches
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