Ceph » rgw

1. We use Swift/API and Large composite objects. Specifically Static Large Objects.

https://docs.openstack.org/swift/latest/overview_large_objects.html#module-swift.common.middleware.slo

2. In Swift/API has a copy method. When a new object is created from an existing one.
https://docs.openstack.org/api-ref/object-store/index.html?expanded=copy-object-detail,create-or-replace-object-detail#copy-object

3. Point. If you create a SLO-object. Make a copy of it, and then delete the original object, then the copy also becomes unavailable.

How to repeat:
1. Creating 100MB file

truncate --size 100M file100M

2. Auth in swift

swift -A "http://....../auth/v1.0" -U ... -K ...

3. Upload it as SLO object

swift upload --use-slo --segment-size=20M SLO_TEST file100M

file100M segment 2
file100M segment 0
file100M segment 1
file100M segment 4
file100M segment 3
file100M

4. curl -sv "$OS_STORAGE_URL/SLO_TEST/copy" -H "X-Auth-Token: $OS_AUTH_TOKEN" -H "x-copy-from: SLO_TEST/file100M" -XPUT

5. Looking at the contents of the container (Note: size of copy 0 bytes)

swift list SLO_TEST --lh

0 2022-09-27 07:28:11 None copy
795 2022-09-27 07:26:42 None file100M
795

6. However, both objects are available for download.

swift download SLO_TEST file100M

file100M [auth 0.000s, headers 0.073s, total 0.816s, 128.431 MB/s]

swift download SLO_TEST copy

copy [auth 0.000s, headers 0.014s, total 0.233s, 450.814 MB/s]

7. Deleting the original object

swift delete SLO_TEST file100M

file100M

8. Try download object "copy"

swift download SLO_TEST copy

Object 'SLO_TEST/copy' not found

9. Then GG comes and deletes nobody's shadow files.

10. In the data field, only the meta object remains, referring to non-existent parts of the original SLO object.