Sent tarantool/small patch and patchset with explanations on reserve
tech drawbacks and space:delete() problem:
https://lists.tarantool.org/pipermail/tarantool-patches/2020-February/014191.html
  
>Понедельник, 10 февраля 2020, 13:50 +03:00 от Konstantin Osipov <kostja.osipov@gmail.com>:
> 
>* Ilya Kosarev < i.kosarev@tarantool.org > [20/02/10 13:44]:
>
>Ilya, please explain the issues in specific terms: references to
>source code, test conditions, and so on.
>
>I don't see any issue with reserving a slab at Tarantool start for
>out-of-memory truncate. I don't see any issues with deletes,
>because deletes are not supposed to use this slab, it should only hold
>truncate record. Deletes do not allocate tuples anyway.
Right, space:delete() problem is not connected with the
space:truncate() problem.
>
>I think you should try to do it and send a patch when you get
>stuck.
>
>You can't expect me to explain how to do it because I don't know
>what you don't know.
>
>--
>Konstantin Osipov, Moscow, Russia 
 
 
--
Ilya Kosarev