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From: Bruce Momjian <[email protected]>
To: Jim Nasby <[email protected]>
Cc: Jeff Frost <[email protected]>
Cc: Chris Browne <[email protected]>
Cc: [email protected]
Subject: Re: [HACKERS] Replication documentation addition
Date: Mon, 20 Nov 2006 10:01:45 -0500 (EST)
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

Jim Nasby wrote:
> On Nov 14, 2006, at 5:11 PM, Bruce Momjian wrote:
> > Basically, when you are broadcasting outside the server, you are
> > broadcasting SQL queries, and those queries do not have information
> > about non-deterministic functions and have issues with universal  
> > commits
> > on all node.
> 
> That's true of simple query broadcasting (ie: pgpool), but not true  
> of Continuent/Sequoia. Continuent's software adds a lot of additional  
> features on top of simple query broadcasting, making it far more  
> robust than simply spewing queries out to every node in the cluster.  
> You still have to be very careful with how you use it, but not nearly  
> as much as with simpler solutions.

Yes, I have heard that Continuent/Sequoia has a process running on each
server that deals with many of the problems with broadcasting.  Not sure
how I should work that into the documentation.  In fact, based on our
description, the improvements Continuent/Sequoia made are probably
clearer.

-- 
  Bruce Momjian   [email protected]
  EnterpriseDB    http://www.enterprisedb.com

  + If your life is a hard drive, Christ can be your backup. +

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