Re: Synchronous Log Shipping Replication

On Tue, 2008-09-09 at 08:24 -0400, Tom Lane wrote:
> "Fujii Masao" <masao.fujii@gmail.com> writes:
> > On Tue, Sep 9, 2008 at 5:11 PM, Simon Riggs <simon@2ndquadrant.com> wrote:
> >> 
> >> Yes. We should have a LogwrtRqst pointer and LogwrtResult pointer for
> >> the send operation. The Write and Send operations can then continue
> >> independently of one another. XLogInsert() cannot advance to a new page
> >> while we are waiting to send or write.
> 
> > Agreed.
> 
> "Agreed"?  That last restriction is a deal-breaker.

OK, I should have said *if wal_buffers are full* XLogInsert() cannot
advance to a new page while we are waiting to send or write. So I don't
think its a deal breaker.

-- Simon Riggs           www.2ndQuadrant.comPostgreSQL Training, Services and Support