ELAN mac cache sync from L3VPN flood the log with errors

2016-09-14 16:29:20,871 | ERROR | pool-24-thread-1 | MDSALUtil | 319 - org.opendaylight.genius.mdsalutil-api - 0.2.0.SNAPSHOT | Error writing to datastore (path, data)
: (KeyedInstanceIdentifier

{targetType=interface org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.forwarding.entries.MacEntry, path=[org.opendaylight.yang.gen.v1.urn.open daylight.netvirt.elan.rev150602.ElanInterfaceForwardingEntries, org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.elan._interface.forwarding.entries.ElanInterfaceMac[key=E lanInterfaceMacKey [_elanInterface=184745940808239:eth1:flat]], org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.forwarding.entries.MacEntry[key=MacEntryKey [_macAddress= PhysAddress [_value=FA:16:3E:C9:6B:7B]]]]}

, MacEntry [_controllerLearnedForwardingEntryTimestamp=1473859760869, _interface=184745940808239:eth1:flat, _key=MacEntryKey [_macAddress=PhysAddres
s [_value=FA:16:3E:C9:6B:7B]], _macAddress=PhysAddress [_value=FA:16:3E:C9:6B:7B], _isStaticAddress=false, augmentation=[]])
2016-09-14 16:29:20,871 | ERROR | pool-24-thread-1 | DOMNotificationRouterEvent | 168 - org.opendaylight.controller.sal-broker-impl - 1.5.0.SNAPSHOT | Delivery of notification org.open
daylight.controller.md.sal.binding.impl.LazySerializedDOMNotification@2639a545 caused an error in listener org.opendaylight.controller.md.sal.binding.impl.BindingDOMNotificationListenerAdapt
er@7662cfc8
java.lang.RuntimeException: OptimisticLockFailedException

{message=Optimistic lock failed., errorList=[RpcError [message=Optimistic lock failed., severity=ERROR, errorType=APPLICATION, tag=re source-denied, applicationTag=null, info=null, cause=org.opendaylight.yangtools.yang.data.api.schema.tree.ConflictingModificationAppliedException: Node was deleted by other transaction.]]}

at org.opendaylight.genius.mdsalutil.MDSALUtil.syncWrite(MDSALUtil.java:531)[319:org.opendaylight.genius.mdsalutil-api:0.2.0.SNAPSHOT]