From: Konstantin Osipov <kostja@tarantool.org>
To: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: tarantool-patches@freelists.org
Subject: Re: [PATCH] vinyl: do not apply run_count_per_level to the last level
Date: Sun, 18 Nov 2018 19:37:52 +0300 [thread overview]
Message-ID: <20181118163752.GC19841@chai> (raw)
In-Reply-To: <6dd0d2fb7e0eff306f141fc867fa5b1b3e4fa3b1.1542387257.git.vdavydov.dev@gmail.com>
* Vladimir Davydov <vdavydov.dev@gmail.com> [18/11/17 07:05]:
> Currently, run_count_per_level index option is applied to each LSM tree
> level. As a result, we may end up storing each key run_count_per_level
> times at the last level alone, which would result in prohibitive space
> amplification. To avoid that, let's ignore run_count_per_level for the
> last level.
>
> Note, we have to tweak quite a few vinyl tests, because they implicitly
> relied on the fact that producing run_count_per_level dumps would never
> trigger compaction.
OK to push.
--
Konstantin Osipov, Moscow, Russia, +7 903 626 22 32
http://tarantool.io - www.twitter.com/kostja_osipov
next prev parent reply other threads:[~2018-11-18 16:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-16 17:00 Vladimir Davydov
2018-11-18 16:37 ` Konstantin Osipov [this message]
2018-11-19 8:20 ` Vladimir Davydov
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