** Also affects: nova/mitaka
Importance: Undecided
Status: New
** Changed in: nova/mitaka
Status: New => Fix Committed
** Changed in: nova/mitaka
Importance: Undecided => Medium
** Changed in: nova/mitaka
Assignee: (unassigned) => Gaudenz Steinlin (gaudenz-debian)
** Also affects: nova/liberty
Importance: Undecided
Status: New
** Changed in: nova/liberty
Status: New => In Progress
** Changed in: nova/liberty
Assignee: (unassigned) => Gaudenz Steinlin (gaudenz-debian)
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https://bugs.launchpad.net/bugs/1591240
Title:
progress_watermark is not updated
Status in OpenStack Compute (nova):
Fix Released
Status in OpenStack Compute (nova) liberty series:
In Progress
Status in OpenStack Compute (nova) mitaka series:
Fix Committed
Bug description:
During the live migration process the progress_watermark/progress_time
are not being (re)updated with the new progress made by the live
migration at the "_live_migration_monitor" function
(virt/libvirt/driver.py).
More specifically, in these lines of code:
if ((progress_watermark is None) or
(progress_watermark > info.data_remaining)):
progress_watermark = info.data_remaining
progress_time = now
It may happen that the first time it gets inside (progress_watermark = None),
the info.data_remaining is still 0, thus the progress_watermark is set to 0.
This avoids to get inside the "if" block in the future iterations (as
progress_watermark=0 is never bigger than info.data_remaining), and thus not
updating neither the progress_watermark, nor the progress_time from that point.
This may lead to (unneeded) abort migrations due to progress_time not
being updated, making (now - progress_time) > progress_timeout.
It can be fixed just by modifying the if clause to be like:
if ((progress_watermark is None) or
(progress_watermark == 0) or
(progress_watermark > info.data_remaining)):
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