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From: Konstantin Osipov <kostja.osipov@gmail.com>
To: Sergey Ostanevich <sergos@tarantool.org>
Cc: tarantool-patches@dev.tarantool.org,
	Vladislav Shpilevoy <v.shpilevoy@tarantool.org>
Subject: Re: [Tarantool-patches] [RFC] Quorum-based synchronous replication
Date: Wed, 6 May 2020 21:55:59 +0300	[thread overview]
Message-ID: <20200506185559.GA2749@atlas> (raw)
In-Reply-To: <20200430145033.GF112@tarantool.org>

* Sergey Ostanevich <sergos@tarantool.org> [20/04/30 17:51]:

A few more issues:

- the spec assumes there is a full mesh. In any other
  topology electing a leader based on the longest wal can easily
  deadlock. Yet it provides no protection against non-full-mesh
  setups. Currently the server can't even detect that this is not
  a full-mesh setup, so can't check if the precondition for this
  to work correctly is met.

- the spec assumes that quorum is identical to the
  number of replicas, and the number of replicas is stable across
  cluster life time. Can I have quorum=2 while the number of
  replicas is 4? Am I allowed to increase the number of replicas
  online? What happens when a replica is added,
  how exactly and starting from which transaction is the leader
  required to collect a bigger quorum?

- the same goes for removing a replica. How is the quorum reduced?

-- 
Konstantin Osipov, Moscow, Russia

  parent reply	other threads:[~2020-05-06 18:56 UTC|newest]

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-03 21:08 Sergey Ostanevich
2020-04-07 13:02 ` Aleksandr Lyapunov
2020-04-08  9:18   ` Sergey Ostanevich
2020-04-08 14:05     ` Konstantin Osipov
2020-04-08 15:06       ` Sergey Ostanevich
2020-04-14 12:58 ` Sergey Bronnikov
2020-04-14 14:43   ` Sergey Ostanevich
2020-04-15 11:09     ` sergos
2020-04-15 14:50       ` sergos
2020-04-16  7:13         ` Aleksandr Lyapunov
2020-04-17 10:10         ` Konstantin Osipov
2020-04-17 13:45           ` Sergey Ostanevich
2020-04-20 11:20         ` Serge Petrenko
2020-04-20 23:32 ` Vladislav Shpilevoy
2020-04-21 10:49   ` Sergey Ostanevich
2020-04-21 22:17     ` Vladislav Shpilevoy
2020-04-22 16:50       ` Sergey Ostanevich
2020-04-22 20:28         ` Vladislav Shpilevoy
2020-04-23  6:58       ` Konstantin Osipov
2020-04-23  9:14         ` Konstantin Osipov
2020-04-23 11:27           ` Sergey Ostanevich
2020-04-23 11:43             ` Konstantin Osipov
2020-04-23 15:11               ` Sergey Ostanevich
2020-04-23 20:39                 ` Konstantin Osipov
2020-04-23 21:38 ` Vladislav Shpilevoy
2020-04-23 22:28   ` Konstantin Osipov
2020-04-30 14:50   ` Sergey Ostanevich
2020-05-06  8:52     ` Konstantin Osipov
2020-05-06 16:39       ` Sergey Ostanevich
2020-05-06 18:44         ` Konstantin Osipov
2020-05-12 15:55           ` Sergey Ostanevich
2020-05-12 16:42             ` Konstantin Osipov
2020-05-13 21:39             ` Vladislav Shpilevoy
2020-05-13 23:54               ` Konstantin Osipov
2020-05-14 20:38               ` Sergey Ostanevich
2020-05-20 20:59                 ` Sergey Ostanevich
2020-05-25 23:41                   ` Vladislav Shpilevoy
2020-05-27 21:17                     ` Sergey Ostanevich
2020-06-09 16:19                       ` Sergey Ostanevich
2020-06-11 15:17                         ` Vladislav Shpilevoy
2020-06-12 20:31                           ` Sergey Ostanevich
2020-05-13 21:36         ` Vladislav Shpilevoy
2020-05-13 23:45           ` Konstantin Osipov
2020-05-06 18:55     ` Konstantin Osipov [this message]
2020-05-06 19:10       ` Konstantin Osipov
2020-05-12 16:03         ` Sergey Ostanevich
2020-05-13 21:42       ` Vladislav Shpilevoy
2020-05-14  0:05         ` Konstantin Osipov
2020-05-07 23:01     ` Konstantin Osipov
2020-05-12 16:40       ` Sergey Ostanevich
2020-05-12 17:47         ` Konstantin Osipov
2020-05-13 21:34           ` Vladislav Shpilevoy
2020-05-13 23:31             ` Konstantin Osipov

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