Hi All,
Good Day,
I have been seeing opensips creating mutiple(duplicate) TCP
connections to the same destination if hit with heavy call load.
*What do i mean?*
opensips ip : 10.10.10.1
Destination : 10.10.10.2
Tcp Children : 32
Ideally opensips will create only one tcp connections and reuses it,if
there's a heavy call load i see there are several tcp connections which are
created to the same destination.
I believe here's the root cause :
- When a child tries to find a connection to the destination it calls
_tcpconn_find() (assuming we are using ip and not id) system checks
tcpconn_aliases_hash for the connection info.
this map is maintained by the parent process and each child lock its
while reaing tcpconn_get().in order to simulate the scenario lets assume a->
parent->state is BAD this method
will return null and so the child tries to create a new
connections,assuming there's a second child trying to find the same
connections and goes through the same process
- Now each child thinks there's no connection to the destination and
calls tcpconn_connect() this will create a socket to the destination and
passes over the fd to the
main process to update the has map.
- Not sure if tcp_connect() should have locking mechanism as in
tcpconn_get().
Please correct me if my understanding is wrong,please share your thoughts.
Thank you.
Regards,
Ravitez.D
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