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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.

  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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