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[Neutron] memchached connections


I restarted neutron-server on all 3 nodes. Those memcached
connections from neutron-server are gone. Everything is back
to normal. It seems like that memcached connections are not
closed properly in neutron-server. The connections pile up
over time. Is there any know issue related? Could any Neutron
experts comment here?

Thanks!
Tony
> -----Original Message-----
> From: Tony Liu <tonyliu0592 at hotmail.com>
> Sent: Friday, September 11, 2020 2:26 PM
> To: openstack-discuss <openstack-discuss at lists.openstack.org>
> Subject: memchached connections
> 
> Hi,
> 
> Is there any guidance or experiences to estimate the number of memcached
> connections?
> 
> Here is memcached connection on one of the 3 controllers.
> Connection number is the total established connections to all 3
> memcached nodes.
> 
> Node 1:
> 10 Keystone workers have 62 connections.
> 11 Nova API workers have 37 connections.
> 6 Neutron server works have 4304 connections.
> 1 memcached has 4973 connections.
> 
> Node 2:
> 10 Keystone workers have 62 connections.
> 11 Nova API workers have 30 connections.
> 6 Neutron server works have 3703 connections.
> 1 memcached has 4973 connections.
> 
> Node 3:
> 10 Keystone workers have 54 connections.
> 11 Nova API workers have 15 connections.
> 6 Neutron server works have 6541 connections.
> 1 memcached has 4973 connections.
> 
> Before I increase the connection limit for memcached, I'd like to
> understand if all the above is expected?
> 
> How Neutron server and memcached take so many connections?
> 
> Any elaboration is appreciated.
> 
> BTW, the problem leading me here is memcached connection timeout, which
> results all services depending on memcached stop working properly.
> 
> 
> Thanks!
> Tony