Apr  5 13:30:36 HOST object-expirer: Exception while deleting object 1490918391 1490986504-OBJECT-PATH Unexpected response: 412 Precondition Failed: #012Traceback (most recent call last):#012  File "/opt/swift/virtualenv/lib/python2.7/site-packages/swift/obj/expirer.py", line 261, in delete_object#012    self.delete_actual_object(actual_obj, timestamp)#012  File "/opt/swift/virtualenv/lib/python2.7/site-packages/swift/obj/expirer.py", line 305, in delete_actual_object#012    (2,))#012  File "/opt/swift/virtualenv/lib/python2.7/site-packages/swift/common/internal_client.py", line 195, in make_request#012    _('Unexpected response: %s') % resp.status, resp)#012UnexpectedResponse: Unexpected response: 412 Precondition Failed (txn: txe73d49c434bc49c5ad01f-0058e51bac)