[PATCH 5/6] space: call before_replace trigger even if space has no indexes

Konstantin Osipov kostja at tarantool.org
Sat Jul 21 23:59:48 MSK 2018

* Vladimir Davydov <vdavydov.dev at gmail.com> [18/07/21 23:52]:
> On Fri, Jul 20, 2018 at 09:39:09PM +0300, Konstantin Osipov wrote:
> > * Vladimir Davydov <vdavydov.dev at gmail.com> [18/07/20 20:45]:
> > > Needed for blackhole spaces (see the next patch), which don't support
> > > indexes per se, but still may have a before_replace trigger installed.
> > 
> > Why do you need to enable before replace triggers for blackhole?
> Why not? before_replace can be installed on a blackhole space so
> I guess it should work, otherwise it may raise questions.
> > What's wrong with on_replace triggers?
> Nothing wrong at all. They work as well.

OK, maybe I'm a performance junkie, but I saw you had to
pessimize before_replace to add support for blackhole, and thought
for a minute that for the task at hand you could get by with
    on_replace(). Now I realize your patch is off the hot path,
    before_replace is expensive because it makes a lookup, not
    because there's a few branches here and there.

Thanks, it's OK to push this patch as well then. I assume you will
be adding a test case for space-with-no-indexes in a later patch?

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

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