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[Bug 1200806] Re: _wait_for_coalesce can hang forever

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>
Date: Wed, 17 Jul 2013 12:37:11 -0000
Reply-to: Bug 1200806 <1200806@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => havana-2

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https://bugs.launchpad.net/bugs/1200806

Title:
  _wait_for_coalesce can hang forever

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  _wait_for_coalesce is designed to wait for the VDI chain to stabilize
  so we can upload snapshots of the instance.

  If the original VDI doesn't have a parent listed, then this can cause
  the _wait_for_coalesce to poll forever because the child VHD will
  never take on a parent of 'None'.

  The solution is to only call _wait_for_coalesce if
  `original_parent_uuid` is not None.

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