[Tarantool-patches] [PATCH 3/7] txn_limbo: fix promote term filtering

[Vladislav Shpilevoy]

Thanks for the patch!

On 10.06.2021 15:32, Serge Petrenko via Tarantool-patches wrote:
> txn_limbo_process() used to filter out promote requests whose term was
> equal to the greatest term seen. This wasn't correct for PROMOTE entries
> with term 1.
> 
> Such entries appear after box.ctl.promote() is issued on an instance
> with disabled elections. Every PROMOTE entry from such an instance has
> term 1, but should still be applied. Fix this in the patch.

Didn't we agree that PROMOTE should bump the term always? I see no purpose
for the PROMOTE which never bumps the term except for the tests, but for
such occasion it would be better to have internal.make_leader() or something
which bypasses everything. Although the best option would to bump the term
always.

I see you did something in the last commit about that, but the part
about `limbo->promote_greatest_term > 1` still remains. It looks very
illegal to point out some terms as "special".