From: Konstantin Osipov <kostja@tarantool.org>
To: tarantool-patches@freelists.org
Subject: [tarantool-patches] Re: [PATCH v2 7/7] relay: join new replicas off read view
Date: Mon, 19 Aug 2019 23:57:21 +0300 [thread overview]
Message-ID: <20190819205721.GH21602@atlas> (raw)
In-Reply-To: <9ed5cd28b89751e0f4edd8f8c9a57d66ba2bd5f8.1566233187.git.vdavydov.dev@gmail.com>
* Vladimir Davydov <vdavydov.dev@gmail.com> [19/08/19 19:57]:
> Historically, we join a new replica off the last checkpoint. As a
> result, we must always keep the last memtx snapshot and all vinyl data
> files corresponding to it. Actually, there's no need to use the last
> checkpoint for joining a replica. Instead we can use the current read
> view as both memtx and vinyl support it. This should speed up the
> process of joining a new replica, because we don't need to replay all
> xlogs written after the last checkpoint, only those that are accumulated
> while we are relaying the current read view. This should also allow us
> to avoid creating a snapshot file on bootstrap, because the only reason
> why we need it is allowing joining replicas. Besides, this is a step
> towards decoupling the vinyl metadata log from checkpointing in
> particular and from xlogs in general.
>
How does this work given relay_* functions are running in a relay thread?
--
Konstantin Osipov, Moscow, Russia
next prev parent reply other threads:[~2019-08-19 20:57 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-19 16:53 [PATCH v2 0/7] Join replicas off the current " Vladimir Davydov
2019-08-19 16:53 ` [PATCH v2 1/7] vinyl: don't pin index for iterator lifetime Vladimir Davydov
2019-08-19 20:35 ` [tarantool-patches] " Konstantin Osipov
2019-08-19 16:53 ` [PATCH v2 2/7] vinyl: don't exempt dropped indexes from dump and compaction Vladimir Davydov
2019-08-19 20:47 ` [tarantool-patches] " Konstantin Osipov
2019-08-20 8:12 ` Vladimir Davydov
2019-08-20 9:02 ` Vladimir Davydov
2019-08-20 11:52 ` Konstantin Osipov
2019-08-20 14:16 ` Vladimir Davydov
2019-08-19 16:53 ` [PATCH v2 3/7] vinyl: get rid of vy_env::join_lsn Vladimir Davydov
2019-08-19 20:49 ` [tarantool-patches] " Konstantin Osipov
2019-08-19 16:53 ` [PATCH v2 4/7] memtx: use ref counting to pin indexes for snapshot Vladimir Davydov
2019-08-19 20:50 ` [tarantool-patches] " Konstantin Osipov
2019-08-19 16:53 ` [PATCH v2 5/7] memtx: enter small delayed free mode from snapshot iterator Vladimir Davydov
2019-08-19 20:51 ` [tarantool-patches] " Konstantin Osipov
2019-08-19 16:53 ` [PATCH v2 6/7] space: get rid of apply_initial_join_row method Vladimir Davydov
2019-08-19 20:54 ` [tarantool-patches] " Konstantin Osipov
2019-08-19 16:53 ` [PATCH v2 7/7] relay: join new replicas off read view Vladimir Davydov
2019-08-19 20:57 ` Konstantin Osipov [this message]
2019-08-20 8:16 ` [tarantool-patches] " Vladimir Davydov
2019-08-20 11:53 ` Konstantin Osipov
2019-08-20 12:05 ` Vladimir Davydov
2019-08-20 13:50 ` Konstantin Osipov
2019-08-20 14:03 ` Vladimir Davydov
2019-08-21 22:08 ` Konstantin Osipov
2019-08-22 8:05 ` Vladimir Davydov
2019-08-19 16:54 ` [PATCH v2 0/7] Join replicas off the current " Vladimir Davydov
2019-08-20 8:53 ` Vladimir Davydov
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