[Libguestfs] [PATCH virt-v2v] v2v: -o rhv-upload: Enable multi-conn

Richard W.M. Jones rjones at redhat.com
Tue Aug 3 19:31:46 UTC 2021


On Tue, Aug 03, 2021 at 02:20:01PM -0500, Eric Blake wrote:
> On Mon, Aug 02, 2021 at 08:41:20AM +0100, Richard W.M. Jones wrote:
> > ---
> >  v2v/rhv-upload-plugin.py | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/v2v/rhv-upload-plugin.py b/v2v/rhv-upload-plugin.py
> > index a3d578176..51e9b33f7 100644
> > --- a/v2v/rhv-upload-plugin.py
> > +++ b/v2v/rhv-upload-plugin.py
> > @@ -169,6 +169,10 @@ def open(readonly):
> >      }
> >  
> >  
> > +def can_multi_conn(h):
> > +    return True
> 
> Should this be h['can_flush'] instead of True?

In the later version this is different(-ly bad):

https://listman.redhat.com/archives/libguestfs/2021-August/msg00022.html

> Are we guaranteed that imageio guarantees a consistent image across
> all other http connections when a flush is received on a single http
> connection?

That's a question for Nir (CC'd).

However it's likely true anyway since even in the the current
implementation it flushes all HTTP connections inside the nbdkit
plugin:

https://github.com/libguestfs/virt-v2v/blob/0d6d15ebdcad4a4df54f397cbc1b46fcdaf3f16a/v2v/rhv-upload-plugin.py#L342

and I didn't change this behaviour in the proposed patches.

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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