Engine logs are flooded with this exception trace when there are no hosts in operational state in a cluster with "gluster service" enabled. Exception logging is not required in this case.
Moving pending bugs not fixed in 3.5.0 to 3.5.1.
This is an automated message: This bug should be fixed in oVirt 3.5.1 RC1, moving to QA
oVirt 3.5.1 has been released. If problems still persist, please make note of it in this bug report.