public inbox for [email protected]  

help / color / mirror / Atom feed

From: Andrey Borodin <[email protected]>
To: Tom Lane <[email protected]>
Cc: Konstantin Osipov <[email protected]>
Cc: Greg Sabino Mullane <[email protected]>
Cc: Nikolay Samokhvalov <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: Built-in Raft replication
Date: Wed, 16 Apr 2025 10:24:48 +0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <Z_1Cq7JvabsFYjQo@ark>
	<CAKAnmmJxGHcQmzXqEQ-nppZjXyH7i5W_7Cz8JNMb2+6c5+D+og@mail.gmail.com>
	<CAM527d9+eGvdih1GxoPDJ2WYs6eitf39oNTxGxnCK1PgF=A8wg@mail.gmail.com>
	<[email protected]>
	<[email protected]>
	<[email protected]>



> On 16 Apr 2025, at 09:26, Tom Lane <[email protected]> wrote:
> 
> Andrey Borodin <[email protected]> writes:
>> I think it's what Konstantin is proposing. To have our own Raft implementation, without dependencies.
> 
> Hmm, OK.  I thought that the proposal involved relying on some existing
> code, but re-reading the thread that was said nowhere.  Still, that
> moves it from a large project to a really large project :-(
> 
> I continue to think that it'd be best to try to implement it as
> an extension, at least up till the point of finding show-stopping
> reasons why it cannot be that.

I think I can provide some reasons why it cannot be neither extension, nor any part running within postmaster reign.

1. When joining cluster, there’s not PGDATA to run postmaster on top of it.

2. After failover, old Primary node must rejoin cluster by running pg_rewind and following timeline switch.

The system in hand must be able to manipulate with PGDATA without starting Postgres.

My question to Konstantin is Why wouldn’t you just add Raft to Patroni? Is there a reason why something like Patroni is not in core and noone rushes to get it in?
Everyone is using it, or system like it.


Best regards, Andrey Borodin.

view thread (13+ messages)  latest in thread

reply

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Reply to all the recipients using the --to and --cc options:
  reply via email

  To: [email protected]
  Cc: [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
  Subject: Re: Built-in Raft replication
  In-Reply-To: <[email protected]>

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox