From: Konstantin Osipov <kostja@tarantool.org> To: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: tarantool-patches@freelists.org, Serge Petrenko <sergepetrenko@tarantool.org>, Kirill Yukhin <kyukhin@tarantool.org> Subject: Re: [tarantool-patches] Re: [PATCH v2] xrow: print corrupted rows on decoding error. Date: Fri, 5 Apr 2019 16:20:15 +0300 [thread overview] Message-ID: <20190405132015.GA1687@chai> (raw) In-Reply-To: <20190405080608.uyuunti2tebak5wl@esperanza> * Vladimir Davydov <vdavydov.dev@gmail.com> [19/04/05 16:11]: > > But provided you had to write your own implementation: > > - why use a macro? > > So that diag_set() and say() preserve file/line. You inline the macro multiple times. This makes the function body longer -> CPU job more difficult. You could easily pass file and line into the function, these are ansi c standard macros, __FILE__ and __LINE__ > > > - why use malloc? > > Because a corrupted request can easily be longer than 256 bytes (that's > how many bytes fits in tt_static_buf). Since it's a slow path, which is > only executed on decode error provided S_VERBOSE log level is enabled, > I reckon using malloc() is fine. It's 1024 bytes. What's the point of printing it as a single say() call, not as multiple ones? Besides, there is a 4k buffer inside say which limits you anwyay. > > - what's wrong with mp_snprint, and if the problem is that it > > doesn't properly escape non-printable characters, why not fix it > > to escape these or implement a version which does? > > Because data can be corrupted, e.g. an MP_ARRAY with N items in the > header having only M < N items in the body. We can't print such data > with mp_snprint. -- Konstantin Osipov, Moscow, Russia, +7 903 626 22 32 http://tarantool.io - www.twitter.com/kostja_osipov
next prev parent reply other threads:[~2019-04-05 13:20 UTC|newest] Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-04-01 13:09 Serge Petrenko 2019-04-03 9:18 ` Vladimir Davydov 2019-04-03 9:41 ` [tarantool-patches] " Kirill Yukhin 2019-04-04 11:52 ` Serge Petrenko 2019-04-04 12:06 ` Vladimir Davydov 2019-04-04 12:29 ` Serge Petrenko 2019-04-04 14:51 ` Vladimir Davydov 2019-04-05 6:18 ` Konstantin Osipov 2019-04-05 8:06 ` Vladimir Davydov 2019-04-05 13:20 ` Konstantin Osipov [this message] 2019-04-05 13:43 ` Vladimir Davydov
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