Public bug reported:

in nova/virt/libvrit/driver of _live_migration_monitor, the
progress_watermark needed to be reset to 0 when progress_watermark is
smaller than info.data_remaning.

when migration iteration began, the progress_watermark maybe the mark of
pre data_remaining of one iteration, so when in a big ram writing env,
it is may cause multiple migration iteration, so it is may cause
data_remaining > progress_watermark, there is a log output to recode
this, so when this happened, and next iteration come in, the
progress_watermark is small than data_remaining forever, and
progress_time may never be reset, it's will cause progress_timeout,
however, it's not progress_timeout.

** Affects: nova
     Importance: Undecided
     Assignee: linbing (hawkerous)
         Status: In Progress

** Changed in: nova
     Assignee: (unassigned) => linbing (hawkerous)

** Changed in: nova
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1625487

Title:
  live_migration progress watermarker need to reset

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  in nova/virt/libvrit/driver of _live_migration_monitor, the
  progress_watermark needed to be reset to 0 when progress_watermark is
  smaller than info.data_remaning.

  when migration iteration began, the progress_watermark maybe the mark
  of pre data_remaining of one iteration, so when in a big ram writing
  env, it is may cause multiple migration iteration, so it is may cause
  data_remaining > progress_watermark, there is a log output to recode
  this, so when this happened, and next iteration come in, the
  progress_watermark is small than data_remaining forever, and
  progress_time may never be reset, it's will cause progress_timeout,
  however, it's not progress_timeout.

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