Yes gzip compression can be used for compressing WAL traffic during streaming replication Following tools can be used in this regard.
SSL compression-SSL support is built in PostgreSQL. You need to ensure you have OpenSSL library support in your PostgreSQL installation.
Also, you can compress WAL traffic by setting up SSH tunneling between master and standby and turn on compression while setting up SSH tunnel. Following link can be followed for the same. http://www.postgresql.org/docs/9.3/static/ssh-tunnels.html
Ofcourse, these are the solutions outside PostgreSQL.
On Tue, Dec 10, 2013 at 4:43 AM, Dmitry Koterov <dmitry@koterov.ru> wrote:
Hello.
Is there a way to compress the traffic between master and slave during the replication?.. The streaming gzip would be quite efficient for that.
(WAL archiving is not too good for this purpose because of high lag. I just need to minimize the cross-datacenter traffic keeping the replication lag low.)