[cinder][tooz]Lock-files are remained

Hi, I'm using Queens cinder with the following setting. --------------------------------- [coordination] backend_url = file://$state_path --------------------------------- As a result, the files like the following were remained under the state path after some operations.[1] cinder-63dacb3d-bd4d-42bb-88fe-6e4180164765-delete_volume cinder-32c426af-82b4-41de-b637-7d76fed69e83-delete_snapshot In my understanding, these are lock-files created for synchronization by tooz. But, these lock-files were not deleted after finishing operations. Is this behaviour correct? [1] e.g. Delete volume, Delete snapshot -- _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/ Rikimaru Honjo E-mail:honjo.rikimaru@ntt-tx.co.jp