[tarantool-patches] Re: [PATCH 2/5] swim: sadly remove cache

[Konstantin Osipov]

* Vladislav Shpilevoy <v.shpilevoy at tarantool.org> [19/07/04 10:15]:
> SWIM sends basically the same message during a round. There was
> a microoptimization so as not to reassemble the message on each
> step. Now it is getting harder to support that island of
> perfectionism, because
> 
>     * Soon all the messages will carry all the sections,
>       including indirect messages. Their body is smaller, so it
>       is not possible to maintain one cached message without
>       reducing its maximal size;
> 
>     * In big-clusters even without any changes a cached message
>       would need to be rebuilt. This is because anti-entropy
>       section won't help much unless it is being changed
>       frequent enough;
> 
>     * In big clusters changes happen often enough to invalidate
>       the cached message constantly, unless SWIM would had
>       maintained what members are included into the cache, and
>       which are not. Then change of a member, not included into
>       the message, would not affect the cache. But it would
>       complicate the code too much.
> 
> Part of #4253

lgtm


-- 
Konstantin Osipov, Moscow, Russia