Re: [pgsql-cluster-hackers] Replication over RDMA with Infiniband orRoCE

> Yes, we are going to implement this over Postgres' streaming replication
> system,
> the usecase is DR, eg: the sync between two datacenter in same city,
> there had FC link, (Now FC could be used to extend IB network, so we are
> going to implement the native RDMA replication for low latency purpose
> for that case-- it is very import for some critical system, also, this
> replication is preferred base on Postgres' stream replication )

...

Well, I think the starting point should be, why is streaming replication
not preferred? It's very fast and very robust.

> 2.) the IB based replication system will work with current IP based
> replication system, it mean that, in a replication system, maybe had IB
> replication, and also had IP replication, the case1 is: NodeA to NodeB
> to NodeC,  NodeA -IB->NodeB --IP-->NodeC ; means, NodeA to NodeB could
> be IB base replication, it provide low latency ;     and NodeB to NodeC
> it is based on IP, it's orig IP based replication system ;  the case2
> is: NodeA--IB-->NodeB, NodeA--IP-->NodeC ; means NodeA to NodeB is IB
> replication; and NodeA to NodeC is IP based replication,
>
> 3.) it will support sync replication and async replication ; also
> support phy replication and logical replication .

...

Honestly, that sounds fairly complex, for not a lot of gain, but I don't
know that I am competely understanding your proposal. This is a very
low-activity mailing list - what I would recommend at this point is writing
up a concise statement about why you need this and run it up the flagpole
to pgsql-hackers@postgresql.org. I promise you will get more of a response
there, for better or for worse. :)

--
Greg Sabino Mullane greg@endpoint.com
End Point Corporation
PGP Key: 2529 DF6A B8F7 9407 E944  45B4 BC9B 9067 1496 4AC8