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I do think an explicit migration interface on NetworkElement is the right way to do it. This way, network elements can decide explicitly when and how to handle this state. Sprinkling if(!nic.getReservationId().equals(context.getReservationId())){ // migration operation return; } everywhere is error prone: - Implementors of new NetworkElements are not aware of this indirectly expressed dependency - This snippet of code (except for the comment) does not in any way indicate the operation. - Chiradeep Vittal On March 29, 2013, 1:49 a.m., Hiroaki Kawai wrote: > > ----------------------------------------------------------- > This is an automatically generated e-mail. To reply, visit: > https://reviews.apache.org/r/9871/ > ----------------------------------------------------------- > > (Updated March 29, 2013, 1:49 a.m.) > > > Review request for cloudstack, Hugo Trippaers and Chiradeep Vittal. > > > Description > ------- > > The location of the virtual machine is provided by DeployDestination, which > will be passed in NetworkGuru#reserve and NetworkElement#prepare. > > During the virtual machine migration, it actually changes DeployDestination > and it looks like that it will tell that event to network components as it > has NetworkManager#prepareNicForMigration. The problem is that althogh the > interface has that method, NetworkManagerImpl does not tell the > DeployDestination changes to network components. > > So IMHO, we need to add calls of NetworkGuru#reserve and > NetworkElement#prepare in NetworkManagerImpl#prepareNicForMigration . And > then, we also need to add calls NetworkGuru#release and > NetworkElement#release after the migration, otherwise the network resources > that plugin reserved will be kept even when the vm leaves off. > > Created a first minimum patch to show the concept. > > > This addresses bug CLOUDSTACK-1638. > > > Diffs > ----- > > docs/en-US/plugin-niciranvp-tables.xml 4f81655 > > plugins/network-elements/nicira-nvp/src/com/cloud/network/NiciraNvpNicMappingVO.java > 0779e69 > > plugins/network-elements/nicira-nvp/src/com/cloud/network/element/NiciraNvpElement.java > 1fcccdb > server/src/com/cloud/network/NetworkManager.java 4124b19 > server/src/com/cloud/network/NetworkManagerImpl.java a98bdd4 > server/src/com/cloud/network/guru/ControlNetworkGuru.java 934cd70 > server/src/com/cloud/network/guru/DirectNetworkGuru.java ee824af > server/src/com/cloud/network/guru/DirectPodBasedNetworkGuru.java 354d7ed > server/src/com/cloud/network/guru/ExternalGuestNetworkGuru.java 24d24f8 > server/src/com/cloud/network/guru/GuestNetworkGuru.java cebfb08 > server/src/com/cloud/network/guru/PodBasedNetworkGuru.java b513325 > server/src/com/cloud/network/guru/StorageNetworkGuru.java 879d0cd > server/src/com/cloud/vm/VirtualMachineManagerImpl.java 9230f4a > setup/db/create-schema.sql 5b6dc04 > > Diff: https://reviews.apache.org/r/9871/diff/ > > > Testing > ------- > > > Thanks, > > Hiroaki Kawai > >