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Re: Keepalive for max_standby_delay

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Greg Stark <gsstark@mit.edu>
Cc: Simon Riggs <simon@2ndquadrant.com>, Josh Berkus <josh@agliodbs.com>, Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>, pgsql-hackers@postgresql.org
Date: 2010-06-03T15:18:06Z
Lists: pgsql-hackers 
Greg Stark <gsstark@mit.edu> writes:
> On Thu, Jun 3, 2010 at 12:11 AM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> It is off-base. The receiver does not "request" data, the sender is
>> what determines how much WAL is sent when.

> Hm, so what happens if the slave blocks, doesn't the sender block when
> the kernel buffers fill up?

Well, if the slave can't keep up, that's a separate problem.  It will
not fail to keep up as a result of the transmission mechanism.

			regards, tom lane