[ovs-dev] Query with respect to OVSDB and vswitchd

Ben Pfaff blp at nicira.com
Mon Aug 31 16:52:53 UTC 2015

On Mon, Aug 31, 2015 at 09:10:19AM +0530, RishiRaj Maulick wrote:
> Hi ,
> I have been very recently using the OVSDB for one of our projects . I am
> able to create my own schema and operate on it . However to better
> understand things , I was also looking at the behavior of vswitchd on the
> default schema.
> I am confused with the events of things that happened -
> 1) I am monitoring the "Bridge" table through ovsdb-client
> 2) Using ovs-vsctl , whenever I add a bridge ( say br0 ) , on the monitor
> console I see that there are 2 activities - one of which is the initial
> "insert" and the next is an update for the "datapath id " that gets
> allocated by the vswitchd.
> This is understandable. In the update the _version field and the datapath
> id field gets mutated to new values.
> 3) However, if I add a second bridge ( say br1 ) , in the monitor console ,
> apart from the above operations pertaining to the new bridge being added (
> br1 ) , I am also seeing that the entry for the previously added bridge br0
> also gets mutated and the only change is the _version field.
> My understanding of the  _uuid and _version fields is that these are
> maintained by the DB for internal purposes and the ovsdb-client cannot
> mutate these.
> So I wanted to understand , why ( or what is the need ) the change of
> *_version* for all of the existing bridges are required , whenever we are
> adding a new bridge.

It's just a bug.  I sent out a fix.  Will you test it?



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