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From: Cyrill Gorcunov via Tarantool-patches <tarantool-patches@dev.tarantool.org>
To: Vladislav Shpilevoy <v.shpilevoy@tarantool.org>
Cc: tml <tarantool-patches@dev.tarantool.org>
Subject: Re: [Tarantool-patches] [PATCH] limbo: introduce request processing hooks
Date: Mon, 12 Jul 2021 11:09:44 +0300
Message-ID: <YOv4yNnQVLgLHrkr@grain> (raw)
In-Reply-To: <4965b115-dd42-0129-0086-a0ff711fa648@tarantool.org>

On Mon, Jul 12, 2021 at 10:03:32AM +0200, Vladislav Shpilevoy wrote:
> > 
> > Now imagine the following: we validated the incoming packet and
> > remember its term in promote_term_map, then we start writting
> > this packet into our WAL and write procedure failed.
> 
> That is the core problem of your entire approach - why do you imagine
> we update promote_term_map before writing to WAL? We do not do that.

We don't do that now, and this is all this patch about - we must not
write the PROMOTE from split-brained node into our wal file at all,
for exactly this reason I splitted processing into phases: "filter" and
"application".

> And you should not do that. Before WAL write there should no be any
> changes. **Zero changes before WAL write**. Before you write to WAL,
> you can only validate requests. Using `const struct txn_limbo *`. With
> zero changes.

If we write screwed PROMOTEs request into our WAL then this patch is not
needed at all.

  reply	other threads:[~2021-07-12  8:09 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-10 22:28 Cyrill Gorcunov via Tarantool-patches
2021-07-11 14:00 ` Vladislav Shpilevoy via Tarantool-patches
2021-07-11 18:22   ` Cyrill Gorcunov via Tarantool-patches
2021-07-12  8:03     ` Vladislav Shpilevoy via Tarantool-patches
2021-07-12  8:09       ` Cyrill Gorcunov via Tarantool-patches [this message]
2021-07-12 21:20         ` Vladislav Shpilevoy via Tarantool-patches
2021-07-12 22:32           ` Cyrill Gorcunov via Tarantool-patches
2021-07-13 19:32             ` Vladislav Shpilevoy via Tarantool-patches
2021-07-12  8:01   ` Serge Petrenko via Tarantool-patches
2021-07-12  8:04     ` Vladislav Shpilevoy via Tarantool-patches
2021-07-12  8:12       ` Cyrill Gorcunov via Tarantool-patches
2021-07-12  8:23         ` Cyrill Gorcunov via Tarantool-patches
2021-07-12 21:20         ` Vladislav Shpilevoy via Tarantool-patches
2021-07-12 22:34           ` Cyrill Gorcunov via Tarantool-patches
2021-07-12  9:43     ` Cyrill Gorcunov via Tarantool-patches
2021-07-12 15:48       ` Cyrill Gorcunov via Tarantool-patches
2021-07-12 16:49         ` Serge Petrenko via Tarantool-patches
2021-07-12 17:04           ` Cyrill Gorcunov via Tarantool-patches
2021-07-12 21:20             ` Vladislav Shpilevoy via Tarantool-patches
2021-07-12 21:52               ` Cyrill Gorcunov via Tarantool-patches
2021-07-12  7:54 ` Serge Petrenko via Tarantool-patches

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