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[Bug 1664123] Re: glance rbd store fill zero to the hole of a rbd

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Ian Cordasco <sigmavirus24@xxxxxxxxx>
Date: Tue, 14 Feb 2017 14:54:37 -0000
Reply-to: Bug 1664123 <1664123@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Project changed: glance => glance-store

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https://bugs.launchpad.net/bugs/1664123

Title:
  glance rbd store fill zero to the hole of a rbd

Status in glance_store:
  New

Bug description:
  Right now, glance_store use python binding to do some thing with rbd.
  When upload rbd image. Because most of all rbd images are sparse. The
  glance_store does not distinguish hole and will fill zero into hole to 
  rbd. 

  So, if you use openstack cli to upload a raw image to glance rbd
  store, you will find it is too slow.Because it will fill zero to all
  the sparse space of raw image to rbd.

  I think, we should add check logic into glance_store. 
  Because glance send the image
  to store, glance needs to keep the sparse of the image.
  The user can specify the check size of sparse.

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