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From: Kevin Grittner <Kevin.Grittner@wicourts.gov>
To: Robert Haas <robertmhaas@gmail.com>
Cc: Simon Riggs <simon@2ndquadrant.com>
Cc: Markus Wanner <markus@bluegap.ch>
Cc: Alvaro Herrera <alvherre@commandprompt.com>
Cc: Andrew Dunstan <andrew@dunslane.net>
Cc: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Cc: MARK CALLAGHAN <mdcallag@gmail.com>
Cc: Aidan Van Dyk <aidan@highrise.ca>
Cc: pgsql-hackers <pgsql-hackers@postgresql.org>
Subject: Re: Re: [COMMITTERS] pgsql: Efficient transaction-controlled synchronous replication.
Date: Fri, 18 Mar 2011 16:48:33 -0500
Message-ID: <4D838CE1020000250003BB06@gw.wicourts.gov> (raw)
In-Reply-To: <AANLkTin3y0VzPADjNmXYWF5t_ou7ywqHARJhaxbQ=sTR@mail.gmail.com>
References: <E1PwMns-00047O-UU@gemulon.postgresql.org>
	<4D741441.2090704@dunslane.net>
	<1299454125.1696.6138.camel@ebony>
	<4D74896C.5030402@enterprisedb.com>
	<4D74DDFA.70800@dunslane.net>
	<4D74E584.7080409@enterprisedb.com>
	<4D74E9FA.7070202@dunslane.net>
	<AANLkTinkzJ=UrLbThZy2KeQg+SjwYqj2r0mDomMwirB7@mail.gmail.com>
	<4D74F3AE.9000802@dunslane.net>
	<4D74FDEC.5040406@enterprisedb.com>
	<4D74FF15.1070804@dunslane.net>
	<1299513979-sup-1987@alvh.no-ip.org>
	<4D832571.5030808@bluegap.ch>
	<AANLkTi=B+cWE-pQJQM=zoA9=Zr25W7zPPMFvvBe11O4E@mail.gmail.com>
	<1300457958.18619.13780.camel@ebony>
	<4D832B4D020000250003BA98@gw.wicourts.gov>
	<4D837EA2.2070205@enterprisedb.com>
	<1300465171.18619.15193.camel@ebony>
	<4D83B02A.5090105@bluegap.ch>
	<1300476590.18619.18115.camel@ebony>
	<AANLkTinaE8pKZ5RyVShF8ZwDF2+GGQ1bZ_Y-jfO2rLAK@mail.gmail.com>
	<4D838723020000250003BAFB@gw.wicourts.gov>
	<AANLkTin3y0VzPADjNmXYWF5t_ou7ywqHARJhaxbQ=sTR@mail.gmail.com>

Robert Haas <robertmhaas@gmail.com> wrote:
 
> Well, the idea is that we don't want to let people depend on the
> value until it's guaranteed to be durably committed.
 
OK, so if you see it on the replica, you know it is in at least two
places.  I guess that makes sense.  It kinda "feels" wrong to see a
view of the replica which is ahead of the master, but I guess it's
the least of the evils.  I guess we should document it, though, so
nobody has a false expectation that seeing something on the replica
means that a connection looking at the master will see something
that current.
 
-Kevin



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  Cc: Kevin.Grittner@wicourts.gov, robertmhaas@gmail.com, simon@2ndquadrant.com, markus@bluegap.ch, alvherre@commandprompt.com, andrew@dunslane.net, heikki.linnakangas@enterprisedb.com, mdcallag@gmail.com, aidan@highrise.ca, pgsql-hackers@postgresql.org
  Subject: Re: Re: [COMMITTERS] pgsql: Efficient transaction-controlled synchronous replication.
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