[ovs-dev] [PATCH] ovsdb: provide raft and command interfaces with priority

Ben Pfaff blp at ovn.org
Fri Jun 11 16:08:19 UTC 2021


On Fri, Jun 11, 2021 at 04:49:44PM +0100, Anton Ivanov wrote:
> 
> On 10/06/2021 23:01, Ben Pfaff wrote:
> > On Tue, Jun 08, 2021 at 10:27:08AM +0100, anton.ivanov at cambridgegreys.com wrote:
> > > From: Anton Ivanov <anton.ivanov at cambridgegreys.com>
> > > 
> > > Set a soft time limit of "raft election timer"/2 on ovsdb
> > > processing.
> > > 
> > > This improves behaviour in large heavily loaded clusters.
> > > While it cannot fully eliminate spurious raft elections
> > > under heavy load, it significantly decreases their number.
> > > 
> > > TODO: randomize session processing order to ensure individual
> > > sessions towards the end of the remotes list are not starved
> > > 
> > > Signed-off-by: Anton Ivanov <anton.ivanov at cambridgegreys.com>
> > Personally I'd consider a random or round-robin processing order to be
> > pretty critical here.
> 
> I have pushed an updated version which implements a "restart where you stopped" approach. This should be mostly identical to the current master in terms of "session starvation" while having "raft at higher priority".

That seems fine, then.


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