Tuesday, September 9, 2008

Re: [HACKERS] Synchronous Log Shipping Replication

Tom Lane wrote:
> Simon Riggs <simon@2ndQuadrant.com> writes:
>> On Tue, 2008-09-09 at 08:24 -0400, Tom Lane wrote:
>>> "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.
> Oh, OK, that's obvious --- there's no place to put more data.

Each WAL sender can keep at most one page locked at a time, right? So,
that should never happen if wal_buffers > 1 + n_wal_senders.

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

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