Hi, when I do a pdb inside a filter in scheduler, it is dropping inside the pdb shell. So far so good. But when I execute these statements inside it as shown below, the buildrequest function get_by_instance_uuid is failing to return any db object: ---------- class ComputeFilter(filters.BaseHostFilter): """Filter on active Compute nodes.""" RUN_ON_REBUILD = False def __init__(self): self.servicegroup_api = servicegroup.API() # Host state does not change within a request run_filter_once_per_request = True def host_passes(self, host_state, spec_obj): """Returns True for only active compute nodes.""" breakpoint(). <-------------- service = host_state.service if service['disabled']: LOG.debug("%(host_state)s is disabled, reason: %(reason)s", {'host_state': host_state, 'reason': service.get('disabled_reason')}) return False else: if not self.servicegroup_api.service_is_up(service): LOG.warning("%(host_state)s has not been heard from in a " "while", {'host_state': host_state}) return False return True ----- at the above breakpoint, it is dropping into the pdb shell. (pdb) from nova import objects as object (pdb) object.BuildRequest.get_by_instance_uuid(spec_obj._context, instance_uuid=spec_obj.instance_uuid)) Build request not found for instance .... ---- But if I place the above buildrequest inside the above same filter and run it normally without breakpoint(), it is working fine. So, why am I not able to do it manually while in pdb, and succeed when done normally ?