Comment 1 for bug 1535224

Bug skimming result
===================
I could reproduce it on master (mitaka) with a devstack single node.
=> CONFIRMED

Nova version
------------
    $ git log --oneline -1
    8ffca40 Imported Translations from Zanata

Steps to reproduce
------------------
   $ nova boot bug1535224 --image cirros-0.3.4-x86_64-uec --flavor m1.tiny
   $ nova meta bug1535224 set abc=1 Abc=2 ABc=3 ABC=4 foo=bar
   $ nova meta bug1535224_2 delete abc

Preanalysis
-----------
The REST API gets the correct info to delete the metadata:
    [...] INFO nova.osapi_compute.wsgi.server [...]
    192.168.122.214 "DELETE
    /v2.1/2cec396e517f4fddb2837eadd824f866/servers/
    faa394f5-7890-44ae-a729-4823106cc7df/metadata/abc HTTP/1.1"
    status: 204 len: 274 time: 0.2725191

The controllers below use case sensitive dicts as data structures.

Therefore I assume the issue on the database layer.

If you have questions, I'm available in the IRC channel #openstack-nova
under the name "markus_z".