Failed to run action heat.stacks_get

[Or Idgar]

When I'm trying to run TripleO task "wait_for_stack_status" in workflow "tripleo.stack.v1.wait_for_stack_complete_or_failed" which uses "heat.stacks_get" action in loop, the action sometimes get failed.

the action result when it fails:
"Failed to run action [action_ex_id=6d44c568-0d93-4860-9a3c-11a4922a8fb9, action_cls='<class 'mistral.actions.action_factory.HeatAction'>', attributes='{u'client_method_name': u'stacks.get'}', params='{u'stack_id': u'ced7762c-fc3f-4893-8b4c-80a86e4443f7'}']\n HeatAction.stacks.get failed: ERROR: Error in KeystoneBase output role_data: No function \"#operator_+\" matches supplied arguments"

the full example when running this workflow:
http://paste.openstack.org/show/618905/

This is critical for developing Octavia post deployment workflow for TripleO.

[Rabi Mishra (rabi)]

Not sure if this has anything specific to do with heat. Looks like it's 'role_data' from tripleo keystone service has some issues. Do you see any error in heat-engine or heat-api logs?

[Or Idgar (oidgar)]

I cut the relevant lines from both mistral and heat logs:
(mistral) executor.log: http://paste.openstack.org/show/618926/
heat_api.log: https://paste.fedoraproject.org/paste/2SM0BG5Dd1gMANXO0AHApQ
heat-engine.log: https://paste.fedoraproject.org/paste/WB5FDbNwFiIR2nXX0EgpTg

let me know if you need additional details.

[Or Idgar (oidgar)]

Talked with Rabi, He suggested to get keystone logs.
Will filter the relevant lines and send pastebin link