"Ed L." <pgsql@bluepolka.net> writes:
> On Saturday March 22 2003 12:00, Tom Lane wrote:
>> Note that all of a transaction's updates will become visible in the
>> pending-update table simultaneously when it commits, so (as long as
>> you grab batches in single SELECTs, or with a serializable transaction)
>> there's no problems with partial transactions being applied by a batch.
> If you grab everything in the queue with a single SELECT, this works.
> Depending on the queue length, that's not always practical, and as noted
> above, committed batches could result in partial transactions on the slave.
> So the riddle is how to get a consistent but batchable replication order.
You don't have to do anything special if you pull the contents of a
batch in a single serializable transaction. I see no reason to think
that using a serializable transaction is "hammering the master"; so
you are asking for a solution to a non-problem.
regards, tom lane