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[Bug 1473953] Re: rbd cannot delete residual image from ceph in some situations

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Mingda Sun <mingda@xxxxxxxxxxxxxxx>
Date: Wed, 29 Jul 2015 03:37:10 -0000
Reply-to: Bug 1473953 <1473953@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Also affects: glance
   Importance: Undecided
       Status: New

** Changed in: glance
     Assignee: (unassigned) => Mingda Sun (mingda)

** Changed in: glance
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1473953

Title:
  rbd cannot delete residual image from ceph in some situations

Status in Glance:
  Fix Committed
Status in glance_store:
  Fix Committed

Bug description:
  When user through glance RESTful api upload image, the image generally
  has a large size.

  In fact, uploading a large enough image may be failed due to http connection broken or other situations like that.
  RBD supports a mechanism that when add operation failed, rollback operation must be triggered (delete residual image if it was created).

  Base on a condition, we have already encountered, that the incomplete image has not been taken snapshot yet, then rollback operation do unprotect snap will throw exception "rbd.ImageNotFound".
  This exception will be disposed finally, while the code relating to remove residual image from ceph has been skipped.

  Therefore, re-uploading image will failed using the same image id due
  to above reason (residual image already exists) & residual image need
  to be deleted manually from ceph.

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