Removal of the Block storage Role fails with 'NoneType' object has no attribute 'split'

Problem

While attempting to remove the block storage role from a host the following error is observed

DuConfigError: Failed to run on-DU authorization task: Auth event ‘on_deauth’ method failed to run from /etc/pf9/resmgr_roles/pf9-cindervolume/5.0.0-1491/cinder_auth_events.py: ‘NoneType’ object has no attribute ‘split’

Environment

• Platform9 Managed OpenStack - v4.0 and Higher
• MySQL

Cause

A volume (in an error state) has the Host value set to Null in the Cinder database.

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"os-vol-host-attr:host": null

When the cinder_auth_events.py attempts to run the following step the NULL value will break the code

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or volume in resp[“volumes”]:    if volume[“os-vol-host-attr:host”].split(“@”)[0] == host_id:    return True

Resolution

Ask the customer to delete the volume that has the NULL host value in the database.