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From: Konstantin Osipov <kostja.osipov@gmail.com>
To: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: tarantool-patches@freelists.org
Subject: Re: [PATCH 4/6] box: use replicaset.vclock in replica join/subscribe
Date: Mon, 26 Nov 2018 20:54:58 +0300	[thread overview]
Message-ID: <20181126175458.GE7839@chai> (raw)
In-Reply-To: <2ab0d1a4bf8a5050ad4ea764b5cab41fd1d5968d.1543152574.git.vdavydov.dev@gmail.com>

* Vladimir Davydov <vdavydov.dev@gmail.com> [18/11/26 10:27]:
> Again, this is something that was introduced by commit f2bccc18485d
> ("Use WAL vclock instead of TX vclock in most places") without any
> justification.
> 
> TX has its own copy of the current vclock - there's absolutely no need
> to inquire it from the WAL thread. Actually, we already use TX local
> vclock in box_process_vote(). No reason to treat join/subscribe any
> different. Moreover, it's even harmful - there may be a gap at the end
> of a WAL file, in which case WAL vclock will be slightly ahead of TX
> vclock so that should a replica try to subscribe it would never finish
> syncing, see #3830.

OK to push.


-- 
Konstantin Osipov, Moscow, Russia, +7 903 626 22 32
http://tarantool.io - www.twitter.com/kostja_osipov

  reply	other threads:[~2018-11-26 17:54 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-25 13:48 [PATCH 0/6] WAL garbage collection and checkpointing fixes Vladimir Davydov
2018-11-25 13:48 ` [PATCH 1/6] vclock: allow to use const vclock as search key Vladimir Davydov
2018-11-26 17:38   ` Konstantin Osipov
2018-11-27  9:56     ` Vladimir Davydov
2018-11-25 13:48 ` [PATCH 2/6] engine: pass vclock instead of lsn to collect_garbage callback Vladimir Davydov
2018-11-26 17:41   ` Konstantin Osipov
2018-11-27  9:56     ` Vladimir Davydov
2018-11-25 13:48 ` [PATCH 3/6] box: do not rotate WAL when replica subscribes Vladimir Davydov
2018-11-26 17:50   ` Konstantin Osipov
2018-11-27  9:57     ` Vladimir Davydov
2018-11-25 13:48 ` [PATCH 4/6] box: use replicaset.vclock in replica join/subscribe Vladimir Davydov
2018-11-26 17:54   ` Konstantin Osipov [this message]
2018-11-27  9:57     ` Vladimir Davydov
2018-11-25 13:48 ` [PATCH 5/6] wal: separate checkpoint and flush paths Vladimir Davydov
2018-11-26 17:58   ` Konstantin Osipov
2018-11-26 20:19     ` Vladimir Davydov
2018-11-28 16:46       ` Konstantin Osipov
2018-11-25 13:48 ` [PATCH 6/6] wal: remove files needed for recovery from backup checkpoints on ENOSPC Vladimir Davydov
2018-11-28 16:14   ` Vladimir Davydov

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