Change in vdsm[ovirt-4.0.5]: virt: Don't crash in migration progress on compression bytes

Hello Michal Skrivanek, Milan Zamazal,

I'd like you to do a code review.  Please visit

https://gerrit.ovirt.org/65306

to review the following change.

Change subject: virt: Don't crash in migration progress on compression bytes
......................................................................

virt: Don't crash in migration progress on compression bytes

If compression is not enabled for a migration then compression stats are
not provided by libvirt.  So when we try to retrieve them in migration
Progress, we must not expect their presence, otherwise we crash there.

Backport-To: 4.0
Bug-Url: https://bugzilla.redhat.com/1380822
Change-Id: I1885940843d705ead161c13258f1979025a03873
Signed-off-by: Milan Zamazal 
Reviewed-on: https://gerrit.ovirt.org/64468
Reviewed-by: Michal Skrivanek 
Continuous-Integration: Jenkins CI
Reviewed-by: Francesco Romani 
Reviewed-on: https://gerrit.ovirt.org/64499
---
M vdsm/virt/migration.py
1 file changed, 1 insertion(+), 1 deletion(-)

git pull ssh://gerrit.ovirt.org:29418/vdsm refs/changes/06/65306/1

diff --git a/vdsm/virt/migration.py b/vdsm/virt/migration.py
index 8f2af23..e502756 100644
--- a/vdsm/virt/migration.py
+++ b/vdsm/virt/migration.py
@@ -769,7 +769,7 @@
             stats[libvirt.VIR_DOMAIN_JOB_MEMORY_REMAINING],
             stats[libvirt.VIR_DOMAIN_JOB_MEMORY_BPS],
             stats[libvirt.VIR_DOMAIN_JOB_MEMORY_CONSTANT],
-            stats[libvirt.VIR_DOMAIN_JOB_COMPRESSION_BYTES],
+            stats.get(libvirt.VIR_DOMAIN_JOB_COMPRESSION_BYTES, 0),
             # available since libvirt 1.3
             stats.get('memory_dirty_rate', -1),
             # available since libvirt 1.3