[ovs-dev] Query: Getting session state with the server from my-ovsdb-client code

[Arunkumar Rg]

Hi Ben,

I'm using ovsdb replication feature. Now when the server transitions from
'Active' to 'Backup' state, the client doesn't get a notification about the
server's state(active/backup).
Obviously the client can use 'ovsdb-server/sync-status' ctl command to pull
the server's state info, but since it is a pull method, I need to do a
periodic polling for getting server's state, which I think is costly.

Further, what I noticed is that the server resets all the remote
connections when it's state changes. So I was thinking to pull the server's
state only when the connection resets, instead of periodic polling.

In my client application(using ovsdb-IDL), I want to clear the
application's info before the server's state changes to 'backup'.

Thanks,
Arun.

On Wed, Aug 30, 2017 at 10:11 AM, Ben Pfaff <blp at ovn.org> wrote:

> On Wed, Aug 30, 2017 at 08:03:39AM +0530, Arunkumar Rg wrote:
> > I'm using ovsdb_idl in my-ovsdb-client code. In my clide code, when I
> > create the idl using ovsdb_idl_create(), I set the 'retry' argument has
> > true, so that if the connection to server gets closed, it does a retry.
> >
> > Now from my client code, I wanted to know the session state with the
> > server. Is there any API or any other way to do it??
> >
> > I need this because whenever the connection to server flaps, I wanted to
> > take some action.
>
> Usually that's not too useful, because the data in the IDL is stable
> across connection flaps.  Can you explain your higher-level goal?
>