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[Launchpad Bug Tracker <1664123@xxxxxxxxxxxxxxxxxx>]

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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.

** Affects: glance
     Importance: Undecided
     Assignee: jazeltq (jazeltq-k)
         Status: New

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glance rbd store fill zero to the hole of a rbd 
https://bugs.launchpad.net/bugs/1664123
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