Did you take a look into the patches from the previous mail ? What do you think about my proposal ? Could you please say if there are any objections in regard to it?
Thank you in advance, Andrei Yahorau
From: Andrei Yahorau/IBA To: pgsql-hackers@postgresql.org, Cc: Mikalai Keida/IBA@IBA Date: 20/07/2018 11:43 Subject: Adding TCP_USER_TIMEOUT support for libpq/psqlodbc
In a few words the suggestion was to use pqopt keepalive options for ODBC configuration for example as follows: pqopt = keepalives=1 keepalives_idle=5 keepalives_count=1 keepalives_interval=1
But under some circumstances it can be not reliable and the connection can loose its keepalives properties and it can remain hanging.
Here is a quote from our discussion: Hmm it seems keepalive stops while waiting for ack. Therefore it's a matter of retransmission control You can use TCP_USER_TIMEOUT on linux but the option is not used in libpq.
In my opinion it make sense to add the support of TCP_USER_TIMEOUT socket option to libpq/psqlodbc connection. The attachment contains a patch with the source code changes regarding this issue. In my implementation it can be configured by new keepalives_user_timeout option within pqopt parameter.
[attachment "0001_TCP_USER_TIMEOUT_libpq-int.patch" deleted by Andrei Yahorau/IBA] [attachment "0001_TCP_USER_TIMEOUT_fe-connect.patch" deleted by Andrei Yahorau/IBA]
