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Re: [Gluster-devel] Replicate/AFR Using Broadcast/Multicast?

From: Gordan Bobic
Subject: Re: [Gluster-devel] Replicate/AFR Using Broadcast/Multicast?
Date: Wed, 13 Oct 2010 08:11:27 +0100
User-agent: Mozilla-Thunderbird (X11/20100328)

Craig Carl wrote:
Gordon -
PGM is still experimental so it will be a while before we would consider implementing it,

Just because it isn't officially ratified doesn't mean it's not stable. PGM has been stable enough to be implemented in Windows since around 2002, and there have been libraries for UNIX OS-es for a while, too.

I would also expect to see network issues as a cluster grows.

Performance reducing as the node count increases isn't seen as a bigger issue?

It would also limit a Gluster cluster to a single broadcast domain. We would have to find a way to manage these challenges, do you have any thoughts?

Why not make the transport switchable between unicast and PGM/broadcast? If you need to cross the broadcast domain boundary, use unicast. This should probably be selectable per node so that local nodes could be on broadcast while remote nodes are on unicast (e.g. for an off-site backup node). This isn't not all that big a deal, though, since you can bridge networks easily enough - and that would still be more efficient than amplifying the write bandwidth usage by a factor of the number of nodes.


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