On 14/09/10 20:48, Simon Riggs wrote:
When each new messages arrives from master the WALreceiver will write the new data to the WAL file, wake the WALwriter and then reply. Each new message from master receives a reply. If no further WAL data has been received the WALreceiver waits on the latch. If the WALReceiver is woken by WALWriter or Startup then it will reply to master with a message, even if no new WAL has been received.
Wrt. the earlier discussion about when the standby sends the acknowledgment, this is the key paragraph. So you *are* sending multiple acknowledgments per transaction, but there is some smarts to combine them when there's a lot of traffic. Fair enough.
-- Heikki Linnakangas EnterpriseDB http://www.enterprisedb.com -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
