From: Sergey Ostanevich <sergos@tarantool.org> To: Sergey Bronnikov <sergeyb@tarantool.org> Cc: tarantool-patches@dev.tarantool.org Subject: Re: [Tarantool-patches] [RFC] Quorum-based synchronous replication Date: Tue, 14 Apr 2020 17:43:08 +0300 [thread overview] Message-ID: <20200414144308.GC1734@tarantool.org> (raw) In-Reply-To: <20200414125848.GA1249@pony.bronevichok.ru> Hi! Thanks for review! On 14 апр 15:58, Sergey Bronnikov wrote: > Hi, > > see 5 comments inline > > On 00:08 Sat 04 Apr , Sergey Ostanevich wrote: > > > > * **Status**: In progress > > * **Start date**: 31-03-2020 > > * **Authors**: Sergey Ostanevich @sergos \<sergos@tarantool.org\> > > * **Issues**: > > 1. Just for convenience, please add https://github.com/tarantool/tarantool/issues/4842 > Done. > > ## Summary > > > > The aim of this RFC is to address the following list of problems > > formulated at MRG planning meeting: > > - protocol backward compatibility to enable cluster upgrade w/o > > downtime > > - consistency of data on replica and leader > > - switch from leader to replica without data loss > > - up to date replicas to run read-only requests > > - ability to switch async replicas into sync ones > > 2. Ability to switch async replicas into sync ones and vice-versa? Or not? > Both ways, updated. > > - guarantee of rollback on leader and sync replicas > > - simplicity of cluster orchestration > > > > What this RFC is not: > > > > - high availability (HA) solution with automated failover, roles > > assignments an so on > > - master-master configuration support > > > > > > ## Background and motivation > > > > There are number of known implemenatation of consistent data presence in > > a cluster. They can be commonly named as "wait for LSN" technique. The > > biggest issue with this technique is the abscence of rollback gauarantees > > 3. typo: gauarantees -> guarantees > done > > at replica in case of transaction failure on one master or some of the > > replics in the cluster. > > 4. typo: replics -> replicas > > done > > To provide such capabilities a new functionality should be introduced in > > Tarantool core, with limitation mentioned before - backward compatilibity > > and ease of cluster orchestration. > > 5. but there is nothing mentioned before about these limitations. > They were named as problems to address, so I renamed them as requirements. [cut] Pushed updated version to the branch. Thanks, Sergos
next prev parent reply other threads:[~2020-04-14 14:43 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 [this message] 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 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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