Re: max_wal_senders must die

Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> On Tue, Oct 19, 2010 at 12:18 PM, Josh Berkus <josh(at)agliodbs(dot)com> wrote:
>> On 10/19/2010 09:06 AM, Greg Smith wrote:
>>> I think Magnus's idea to bump the default to 5 triages the worst of the
>>> annoyance here, without dropping the feature (which has uses) or waiting
>>> for new development to complete.

> Setting max_wal_senders to a non-zero value causes additional work to
> be done every time a transaction commits, aborts, or is prepared.

Yes. This isn't just a numeric parameter; it's also a boolean
indicating "do I want to pay the overhead to be prepared to be a
replication master?". Josh has completely failed to make a case that
that should be the default. In fact, the system would fail to start
at all if we just changed the default for max_wal_senders and not the
default for wal_level.

regards, tom lane