Github user jburwell commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1371#discussion_r62779198
  
    --- Diff: 
engine/orchestration/src/org/apache/cloudstack/engine/orchestration/NetworkOrchestrator.java
 ---
    @@ -1445,28 +1466,31 @@ public void prepareAllNicsForMigration(final 
VirtualMachineProfile vm, final Dep
             Long guestNetworkId = null;
             for (final NicVO nic : nics) {
                 final NetworkVO network = 
_networksDao.findById(nic.getNetworkId());
    -            if(network.getTrafficType().equals(TrafficType.Guest) && 
network.getGuestType().equals(GuestType.Isolated)){
    +            if (network.getTrafficType().equals(TrafficType.Guest) && 
network.getGuestType().equals(GuestType.Isolated)) {
    +
                     guestNetworkId = network.getId();
                 }
                 final Integer networkRate = 
_networkModel.getNetworkRate(network.getId(), vm.getId());
     
                 final NetworkGuru guru = 
AdapterBase.getAdapterByName(networkGurus, network.getGuruName());
                 final NicProfile profile = new NicProfile(nic, network, 
nic.getBroadcastUri(), nic.getIsolationUri(), networkRate,
                         
_networkModel.isSecurityGroupSupportedInNetwork(network), 
_networkModel.getNetworkTag(vm.getHypervisorType(), network));
    -            if(guru instanceof NetworkMigrationResponder){
    -                if(!((NetworkMigrationResponder) 
guru).prepareMigration(profile, network, vm, dest, context)){
    -                    s_logger.error("NetworkGuru "+guru+" 
prepareForMigration failed."); // XXX: Transaction error
    +            if (guru instanceof NetworkMigrationResponder) {
    +                if 
(!((NetworkMigrationResponder)guru).prepareMigration(profile, network, vm, 
dest, context)) {
    +                    s_logger.error("NetworkGuru " + guru + " 
prepareForMigration failed."); // XXX: Transaction error
    +
                     }
                 }
                 final List<Provider> providersToImplement = 
getNetworkProviders(network.getId());
                 for (final NetworkElement element : networkElements) {
                     if (providersToImplement.contains(element.getProvider())) {
                         if 
(!_networkModel.isProviderEnabledInPhysicalNetwork(_networkModel.getPhysicalNetworkId(network),
 element.getProvider().getName())) {
    -                        throw new CloudRuntimeException("Service provider 
" + element.getProvider().getName() + " either doesn't exist or is not enabled 
in physical network id: " + network.getPhysicalNetworkId());
    +                        throw new CloudRuntimeException("Service provider 
" + element.getProvider().getName() + " either doesn't exist or is not enabled 
in physical network id: "
    +                                + network.getPhysicalNetworkId());
                         }
    -                    if(element instanceof NetworkMigrationResponder){
    -                        if(!((NetworkMigrationResponder) 
element).prepareMigration(profile, network, vm, dest, context)){
    -                            s_logger.error("NetworkElement "+element+" 
prepareForMigration failed."); // XXX: Transaction error
    +                    if (element instanceof NetworkMigrationResponder) {
    +                        if 
(!((NetworkMigrationResponder)element).prepareMigration(profile, network, vm, 
dest, context)) {
    +                            s_logger.error("NetworkElement " + element + " 
prepareForMigration failed."); // XXX: Transaction error
    --- End diff --
    
    Should this method continue if the ``prepareMigration`` call fails?  If 
not, should it return or throw an exception?


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