From: Cyrill Gorcunov via Tarantool-patches <tarantool-patches@dev.tarantool.org>
To: Serge Petrenko <sergepetrenko@tarantool.org>
Cc: Vladislav Shpilevoy <v.shpilevoy@tarantool.org>,
tml <tarantool-patches@dev.tarantool.org>
Subject: Re: [Tarantool-patches] [PATCH v8 2/2] relay: provide information about downstream lag
Date: Thu, 17 Jun 2021 12:58:15 +0300 [thread overview]
Message-ID: <YMsct0yYlExD1wkI@grain> (raw)
In-Reply-To: <ca30c296-296d-9db1-52ff-cf2fa7a7c3fc@tarantool.org>
On Thu, Jun 17, 2021 at 12:01:32PM +0300, Serge Petrenko wrote:
> I think I understand what you mean now. But still, this description is
> confusing.
>
> When you're saying it's "time delta when data is already written to a
> replica's WAL" it sounds like the delta is taken on replica, not on master.
> And that's not true.
> It's also unclear from this description that packet travel time (ack from
> replica to master) is included into downstream.lag
>
> So I would reformulate the description to something like
>
> "Downstream.lag is the lag between the main node writes a certain
> transaction to it's own WAL and the moment it receives an ack for
> this transaction from a replica".
Thanks, Serge! I'll update the description.
next prev parent reply other threads:[~2021-06-17 9:58 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 15:55 [Tarantool-patches] [PATCH v8 0/2] relay: provide downstream lag information Cyrill Gorcunov via Tarantool-patches
2021-06-07 15:55 ` [Tarantool-patches] [PATCH v8 1/2] applier: send transaction's first row WAL time in the applier_writer_f Cyrill Gorcunov via Tarantool-patches
2021-06-07 19:20 ` Vladislav Shpilevoy via Tarantool-patches
2021-06-15 9:36 ` Serge Petrenko via Tarantool-patches
2021-06-16 13:32 ` Cyrill Gorcunov via Tarantool-patches
2021-06-17 9:16 ` Serge Petrenko via Tarantool-patches
2021-06-07 15:55 ` [Tarantool-patches] [PATCH v8 2/2] relay: provide information about downstream lag Cyrill Gorcunov via Tarantool-patches
2021-06-07 19:21 ` Vladislav Shpilevoy via Tarantool-patches
2021-06-08 8:40 ` Cyrill Gorcunov via Tarantool-patches
2021-06-08 9:58 ` Cyrill Gorcunov via Tarantool-patches
2021-06-08 18:15 ` Vladislav Shpilevoy via Tarantool-patches
2021-06-15 10:03 ` Serge Petrenko via Tarantool-patches
2021-06-17 6:55 ` Cyrill Gorcunov via Tarantool-patches
2021-06-17 9:01 ` Serge Petrenko via Tarantool-patches
2021-06-17 9:58 ` Cyrill Gorcunov via Tarantool-patches [this message]
2021-06-07 19:20 ` [Tarantool-patches] [PATCH v8 0/2] relay: provide downstream lag information Vladislav Shpilevoy via Tarantool-patches
2021-06-07 20:00 ` Cyrill Gorcunov via Tarantool-patches
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