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I configured swift as my glance backend. 
I have 5 data servers, 2 zones and replicas. 

CONFIG_SWIFT_STORAGE_HOSTS=10.35.XX.XX,10.35.XX.XX,10.35.XX.XX,10.35.XX.XX,10.35.XX.XX

# Number of swift storage zones, this number MUST be no bigger than
# the number of storage devices configured
CONFIG_SWIFT_STORAGE_ZONES=2

# Number of swift storage replicas, this number MUST be no bigger
# than the number of storage zones configured
CONFIG_SWIFT_STORAGE_REPLICAS=2

# FileSystem type for storage nodes
CONFIG_SWIFT_STORAGE_FSTYPE=ext4


I fail to create an image due to space issue on the data servers and when I run swift list I can see leftovers + errors in glance log about reset of content:

2013-10-28 13:12:39.518 4957 ERROR glance.store.swift [-] Failed to add object to Swift.
Got error from Swift: put_object('glance', 'eb51f83b-7993-4e94-bba3-9ad9dc7e8525-00001', ...) failure and no ability to reset contents for reupload.
2013-10-28 13:12:39.518 4957 ERROR glance.api.v1.upload_utils [-] Failed to upload image eb51f83b-7993-4e94-bba3-9ad9dc7e8525
2013-10-28 13:12:39.518 4957 TRACE glance.api.v1.upload_utils Traceback (most recent call last):
2013-10-28 13:12:39.518 4957 TRACE glance.api.v1.upload_utils   File "/usr/lib/python2.6/site-packages/glance/api/v1/upload_utils.py", line 101, in upload_data_to_store
2013-10-28 13:12:39.518 4957 TRACE glance.api.v1.upload_utils     store)
2013-10-28 13:12:39.518 4957 TRACE glance.api.v1.upload_utils   File "/usr/lib/python2.6/site-packages/glance/store/__init__.py", line 333, in store_add_to_backend
2013-10-28 13:12:39.518 4957 TRACE glance.api.v1.upload_utils     (location, size, checksum, metadata) = store.add(image_id, data, size)
2013-10-28 13:12:39.518 4957 TRACE glance.api.v1.upload_utils   File "/usr/lib/python2.6/site-packages/glance/store/swift.py", line 441, in add
2013-10-28 13:12:39.518 4957 TRACE glance.api.v1.upload_utils     raise glance.store.BackendException(msg)
2013-10-28 13:12:39.518 4957 TRACE glance.api.v1.upload_utils BackendException: Failed to add object to Swift.
2013-10-28 13:12:39.518 4957 TRACE glance.api.v1.upload_utils Got error from Swift: put_object('glance', 'eb51f83b-7993-4e94-bba3-9ad9dc7e8525-00001', ...) failure and no ability to reset contents for reupload.
2013-10-28 13:12:39.518 4957 TRACE glance.api.v1.upload_utils 
(END) 


[root@opens-vdsb ~(keystone_glance)]# swift list glance 
5a2a41a3-cfb7-4ba6-80f0-3c43690cdd02-00001
be662602-52e9-49cc-93f7-955847190d76
eb51f83b-7993-4e94-bba3-9ad9dc7e8525-00001

** Affects: glance
     Importance: Undecided
         Status: New

-- 
failure and no ability to reset contents for reupload
https://bugs.launchpad.net/bugs/1245444
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