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From: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
To: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: Simon Riggs <simon@2ndQuadrant.com>
Cc: MARK CALLAGHAN <mdcallag@gmail.com>
Cc: Markus Wanner <markus@bluegap.ch>
Cc: Alvaro Herrera <alvherre@commandprompt.com>
Cc: Andrew Dunstan <andrew@dunslane.net>
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 17:47:46 +0200
Message-ID: <4D837EA2.2070205@enterprisedb.com> (raw)
In-Reply-To: <4D832B4D020000250003BA98@gw.wicourts.gov>
References: <E1PwMns-00047O-UU@gemulon.postgresql.org>
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	<1299454125.1696.6138.camel@ebony>
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	<AANLkTinkzJ=UrLbThZy2KeQg+SjwYqj2r0mDomMwirB7@mail.gmail.com>
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	<4D74FDEC.5040406@enterprisedb.com>
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	<4D832571.5030808@bluegap.ch>
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	<1300457958.18619.13780.camel@ebony>
	<4D832B4D020000250003BA98@gw.wicourts.gov>

On 18.03.2011 16:52, Kevin Grittner wrote:
> Simon Riggs<simon@2ndQuadrant.com>  wrote:
>
>> In PostgreSQL other users cannot observe the commit until an
>> acknowledgement has been received.
>
> Really?  I hadn't picked up on that.  That makes for a lot of
> complication on crash-and-recovery of a master, but if we can pull
> it off, that's really cool.  If we do that and MySQL doesn't, we
> definitely don't want to use the same terminology they do, which
> would imply the same behavior.

To be clear: other users cannot observe the commit until standby 
acknowledges it - unless the master crashes while waiting for the 
acknowledgment. If that happens, the commit will be visible to everyone 
after recovery.

-- 
   Heikki Linnakangas
   EnterpriseDB   http://www.enterprisedb.com



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