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From: Konstantin Osipov <kostja.osipov@gmail.com>
To: Georgy Kirichenko <georgy@tarantool.org>
Cc: tarantool-patches@dev.tarantool.org
Subject: Re: [Tarantool-patches] [PATCH] Trigger on vclock change
Date: Thu, 14 Nov 2019 22:48:06 +0300	[thread overview]
Message-ID: <20191114194806.GA20289@atlas> (raw)
In-Reply-To: <2359844.DWZl6MdUWF@home.lan>

* Georgy Kirichenko <georgy@tarantool.org> [19/11/14 22:42]:
> A replica state is described by 2 vclocks - written and committed ones. Right 
> now it is not an issue to report them both as an applier submits transaction 
> asynchronously. In addition to these two vclocks (yes, the both could be 
> transferred from the WAL thread) applier will report a reject vclock - the 
> vclock where applying breaks, and this could be done from TX. I do not like 
> the idea to split transmission between 2 threads. The write and reject vclocks 
> are used to evaluate majority whereas commit vclock instructs a whole cluster 
> that majority was already reached. The main point is that any replica member 
> could commit a transaction - this relaxes RAFT limitations and increases the 
> whole cluster durability (and it is simpler in design and implementation, 
> really). Also the new synchronous replication design has a lot of advantages 
> in comparison with RAFT but let us discuss it in another thread. If you 
> interested please ask for details as I have not enough time to write public 
> document right now.
> Returning to the subject, I would like to conclude that wal on_commit and 
> on_write triggers are good source to initiate status transmission. And the 
> trigger implemented by Maria will be replaced by replica on_commit which 
> allows us not to change anything at higher levels.

Congratulations, Georgy, maybe you even get a Turing award for
inventing a new protocol.

Wait... they don't give a Turing award for "protocols" which have
no proof and yield inconsistent results, or do they?

Meanwhile, if you have a design in mind, you could send an RFC. I
will respond to the RFC.

PS What a shame...

-- 
Konstantin Osipov, Moscow, Russia

  reply	other threads:[~2019-11-14 19:48 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-14 12:57 Maria
2019-11-14 13:44 ` Konstantin Osipov
2019-11-14 14:06   ` Georgy Kirichenko
2019-11-14 15:26     ` Konstantin Osipov
2019-11-14 17:13       ` Georgy Kirichenko
2019-11-14 17:33         ` Konstantin Osipov
2019-11-14 19:16           ` Georgy Kirichenko
2019-11-14 19:48             ` Konstantin Osipov [this message]
2019-11-14 20:01               ` Georgy Kirichenko
2019-11-15  1:57                 ` Konstantin Osipov
2019-11-15  6:02                   ` Georgy Kirichenko
2019-11-15 13:57                     ` Konstantin Osipov
2019-11-15 19:57                       ` Georgy Kirichenko
2019-11-16 10:37                         ` Konstantin Osipov
2019-11-16 20:43                           ` Georgy Kirichenko
2019-11-16 11:56                         ` Konstantin Osipov
2019-11-16 20:34                           ` Georgy Kirichenko
2019-11-18  9:31                             ` Konstantin Osipov
2020-06-02 12:22                               ` Maria Khaydich
2020-06-03 10:12                                 ` Sergey Ostanevich
2020-06-03 12:08                                   ` Alexander Turenko

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