Re: Why there are no max_wal_receivers

On 10/06/2013 09:53 PM, Amit Langote wrote:

Hi,

On Mon, Oct 7, 2013 at 12:02 PM, 高健 <luckyjackgao@gmail.com> wrote:

Hello :


I found that for PG9.2.4, there is parameter max_wal_senders,

But there is no parameter of max_wal_receivers.

max_wal_senders is the maximum number of WAL sender processes that a
primary server can create in response to requests from the standby
servers. One WAL sender process is created on the primary server for
each standby which would running the corresponding WAL receiver. So
there is one-to-one mapping between WAL senders and WAL receivers
(standbys).

Just to add, pg_basebackup also counts against the total of receivers:

http://www.postgresql.org/docs/9.3/interactive/app-pgbasebackup.html

--
Amit Langote

--
Adrian Klaver
adrian.klaver@gmail.com