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[Sean Dague <sean@xxxxxxxxx>]

** Changed in: nova/liberty
       Status: In Progress => Fix Released

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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:
  Fix Released
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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