renderers/vpp/src/main/java/org/opendaylight/groupbasedpolicy/renderer/vpp/policy/BridgeDomainManagerImpl.java

   1 /*
   2  * Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.groupbasedpolicy.renderer.vpp.policy;
  10
  11 import java.util.Collection;
  12 import java.util.Collections;
  13 import java.util.concurrent.TimeoutException;
  14
  15 import javax.annotation.Nonnull;
  16 import javax.annotation.Nullable;
  17
  18 import org.opendaylight.controller.md.sal.binding.api.ClusteredDataTreeChangeListener;
  19 import org.opendaylight.controller.md.sal.binding.api.DataBroker;
  20 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification;
  21 import org.opendaylight.controller.md.sal.binding.api.DataObjectModification.ModificationType;
  22 import org.opendaylight.controller.md.sal.binding.api.DataTreeIdentifier;
  23 import org.opendaylight.controller.md.sal.binding.api.DataTreeModification;
  24 import org.opendaylight.controller.md.sal.binding.api.ReadOnlyTransaction;
  25 import org.opendaylight.controller.md.sal.binding.api.WriteTransaction;
  26 import org.opendaylight.controller.md.sal.common.api.data.LogicalDatastoreType;
  27 import org.opendaylight.controller.md.sal.common.api.data.ReadFailedException;
  28 import org.opendaylight.groupbasedpolicy.renderer.vpp.api.BridgeDomainManager;
  29 import org.opendaylight.groupbasedpolicy.renderer.vpp.config.ConfigUtil;
  30 import org.opendaylight.groupbasedpolicy.renderer.vpp.util.VppIidFactory;
  31 import org.opendaylight.groupbasedpolicy.util.DataStoreHelper;
  32 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.Config;
  33 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.bridge.domain.base.attributes.PhysicalLocationRef;
  34 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.config.GbpBridgeDomain;
  35 import org.opendaylight.yang.gen.v1.urn.opendaylight.groupbasedpolicy.vpp_renderer.rev160425.config.GbpBridgeDomainKey;
  36 import org.opendaylight.yang.gen.v1.urn.opendaylight.l2.types.rev130827.VlanId;
  37 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev170607.VxlanVni;
  38 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev170607.bridge.domains.state.BridgeDomain;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.v3po.rev170607.bridge.domains.state.BridgeDomainKey;
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.status.rev170327.BridgeDomainStatusAugmentation;
  41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.status.rev170327.BridgeDomainStatusFields.BridgeDomainStatus;
  42 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.topology.rev160129.NodeVbridgeAugment;
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.topology.rev160129.TopologyTypesVbridgeAugment;
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.topology.rev160129.TopologyTypesVbridgeAugmentBuilder;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.topology.rev160129.TopologyVbridgeAugment;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.topology.rev160129.TopologyVbridgeAugmentBuilder;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.topology.rev160129.network.topology.topology.node.BridgeMember;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.topology.rev160129.network.topology.topology.topology.types.VbridgeTopologyBuilder;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.tunnel.vlan.rev170327.NodeVbridgeVlanAugment;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.tunnel.vlan.rev170327.NodeVbridgeVlanAugmentBuilder;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.tunnel.vlan.rev170327.TunnelTypeVlan;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.tunnel.vlan.rev170327.network.topology.topology.tunnel.parameters.VlanNetworkParametersBuilder;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.tunnel.vxlan.rev170327.TunnelTypeVxlan;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vbridge.tunnel.vxlan.rev170327.network.topology.topology.tunnel.parameters.VxlanTunnelParametersBuilder;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.vpp.vlan.rev170607._802dot1q;
  56 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.NodeId;
  57 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.TopologyId;
  58 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.Topology;
  59 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyBuilder;
  60 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.TopologyKey;
  61 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.Node;
  62 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeBuilder;
  63 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.NodeKey;
  64 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.TopologyTypes;
  65 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.network.topology.topology.TopologyTypesBuilder;
  66 import org.opendaylight.yang.gen.v1.urn.tbd.params.xml.ns.yang.network.topology.rev131021.node.attributes.SupportingNodeBuilder;
  67 import org.opendaylight.yangtools.concepts.ListenerRegistration;
  68 import org.opendaylight.yangtools.yang.binding.DataObject;
  69 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  70 import org.slf4j.Logger;
  71 import org.slf4j.LoggerFactory;
  72
  73 import com.google.common.base.Optional;
  74 import com.google.common.base.Preconditions;
  75 import com.google.common.util.concurrent.CheckedFuture;
  76 import com.google.common.util.concurrent.FutureCallback;
  77 import com.google.common.util.concurrent.Futures;
  78 import com.google.common.util.concurrent.ListenableFuture;
  79 import com.google.common.util.concurrent.MoreExecutors;
  80 import com.google.common.util.concurrent.SettableFuture;
  81
  82 public class BridgeDomainManagerImpl implements BridgeDomainManager {
  83
  84     private static final Logger LOG = LoggerFactory.getLogger(BridgeDomainManagerImpl.class);
  85     private static final TopologyId SUPPORTING_TOPOLOGY_NETCONF = new TopologyId("topology-netconf");
  86     private static final TopologyTypes VBRIDGE_TOPOLOGY_TYPE = new TopologyTypesBuilder().addAugmentation(
  87             TopologyTypesVbridgeAugment.class,
  88             new TopologyTypesVbridgeAugmentBuilder().setVbridgeTopology(new VbridgeTopologyBuilder().build()).build())
  89             .build();
  90     private final DataBroker dataProvider;
  91
  92     private static final class ListenableFutureSetter<T extends DataObject>
  93             implements ClusteredDataTreeChangeListener<T> {
  94
  95         private static final Logger LOG = LoggerFactory.getLogger(ListenableFutureSetter.class);
  96         private final SettableFuture<Void> future;
  97         private final ModificationType modificationForFutureSet;
  98         private final DataTreeIdentifier<T> iid;
  99         private final ListenerRegistration<ListenableFutureSetter<T>> registeredListener;
 100
 101         private ListenableFutureSetter(DataBroker dataProvider, SettableFuture<Void> future,
 102                                        DataTreeIdentifier<T> iid, ModificationType modificationForFutureSet) {
 103             this.future = Preconditions.checkNotNull(future);
 104             Preconditions.checkArgument(!future.isDone());
 105             this.modificationForFutureSet = Preconditions.checkNotNull(modificationForFutureSet);
 106             this.iid = Preconditions.checkNotNull(iid);
 107             if(!ConfigUtil.getInstance().isL3FlatEnabled()) {
 108                 registeredListener = dataProvider.registerDataTreeChangeListener(iid, this);
 109                 LOG.debug("Registered listener for path {}", iid.getRootIdentifier());
 110             } else {
 111                 throw new IllegalStateException("L3 flat is enabled, BD manager should not even be registering now!");
 112             }
 113         }
 114
 115         @Override
 116         public void onDataTreeChanged(@Nonnull final Collection<DataTreeModification<T>> changes) {
 117             changes.forEach(modification -> {
 118                 final DataObjectModification<T> rootNode = modification.getRootNode();
 119                 final ModificationType modificationType = rootNode.getModificationType();
 120                 if (modificationType == modificationForFutureSet) {
 121                     LOG.debug("{} in OPER DS: {}", modificationType.name(), iid.getRootIdentifier());
 122                     final T data = rootNode.getDataAfter();
 123                     // If waiting for bridge domain creation, do more specific check about BD status
 124                     if (data != null && data instanceof BridgeDomain) {
 125                         final BridgeDomain domain = (BridgeDomain) data;
 126                         final BridgeDomainStatusAugmentation statusAugment =
 127                                 domain.getAugmentation(BridgeDomainStatusAugmentation.class);
 128                         final BridgeDomainStatus status = statusAugment.getBridgeDomainStatus();
 129                         switch (status) {
 130                             case Started: {
 131                                 LOG.debug("Bridge domain {} started", domain.getName());
 132                                 unregister(future.set(null));
 133                                 break;
 134                             }
 135                             case Failed: {
 136                                 LOG.warn("Bridge domain {} failed to start", domain.getName());
 137                                 unregister(future.set(null));
 138                                 break;
 139                             }
 140                             case Starting:
 141                             case Stopped: {
 142                                 LOG.debug("Bridge domain {} status changed to {}", domain.getName(), status.getName());
 143                                 break;
 144                             }
 145                         }
 146                     } else {
 147                         unregister(future.set(null));
 148                     }
 149                 }
 150             });
 151         }
 152
 153         private void unregister(boolean _true) {
 154             if (_true) {
 155                 LOG.debug("Unregistering listener for path {}", iid.getRootIdentifier());
 156                 if (registeredListener != null) {
 157                     registeredListener.close();
 158                 }
 159             }
 160         }
 161     }
 162
 163     public BridgeDomainManagerImpl(DataBroker dataProvider) {
 164         this.dataProvider = Preconditions.checkNotNull(dataProvider);
 165     }
 166
 167     private static NodeBuilder createBasicVppNodeBuilder(NodeId nodeId) {
 168         return new NodeBuilder().setNodeId(nodeId).setSupportingNode(Collections.singletonList(
 169                 new SupportingNodeBuilder().setTopologyRef(SUPPORTING_TOPOLOGY_NETCONF).setNodeRef(nodeId).build()));
 170     }
 171
 172     @Override
 173     public ListenableFuture<Void> createVxlanBridgeDomainOnVppNode(@Nonnull final String bridgeDomainName,
 174                                                                    @Nonnull final VxlanVni vni,
 175                                                                    @Nonnull final NodeId vppNodeId) {
 176         TopologyVbridgeAugment topologyAug = new TopologyVbridgeAugmentBuilder().setTunnelType(TunnelTypeVxlan.class)
 177                 .setArpTermination(false)
 178                 .setFlood(true)
 179                 .setForward(true)
 180                 .setLearn(true)
 181                 .setUnknownUnicastFlood(true)
 182                 .setTunnelParameters(new VxlanTunnelParametersBuilder().setVni(vni).build())
 183                 .build();
 184         return createBridgeDomainOnVppNode(bridgeDomainName, topologyAug,
 185                 createBasicVppNodeBuilder(vppNodeId).build());
 186     }
 187
 188     @Override
 189     public ListenableFuture<Void> createVlanBridgeDomainOnVppNode(@Nonnull final String bridgeDomainName,
 190                                                                   @Nonnull final VlanId vlanId,
 191                                                                   @Nonnull final NodeId vppNodeId) {
 192         TopologyVbridgeAugment topologyAug = new TopologyVbridgeAugmentBuilder().setTunnelType(TunnelTypeVlan.class)
 193                 .setArpTermination(false)
 194                 .setFlood(true)
 195                 .setForward(true)
 196                 .setLearn(true)
 197                 .setUnknownUnicastFlood(true)
 198                 .setTunnelParameters(
 199                         new VlanNetworkParametersBuilder().setVlanId(vlanId).setVlanType(_802dot1q.class).build())
 200                 .build();
 201         InstanceIdentifier<GbpBridgeDomain> bridgeDomainConfigIid = InstanceIdentifier.builder(Config.class)
 202                 .child(GbpBridgeDomain.class, new GbpBridgeDomainKey(bridgeDomainName))
 203                 .build();
 204         ReadOnlyTransaction rTx = dataProvider.newReadOnlyTransaction();
 205         CheckedFuture<Optional<GbpBridgeDomain>, ReadFailedException> futureTopology =
 206                 rTx.read(LogicalDatastoreType.CONFIGURATION, bridgeDomainConfigIid);
 207         rTx.close();
 208         return Futures.transformAsync(futureTopology, optBridgeDomainConf -> {
 209             if (optBridgeDomainConf != null && optBridgeDomainConf.isPresent()
 210                 && optBridgeDomainConf.get().getPhysicalLocationRef() != null) {
 211                 for (PhysicalLocationRef ref : optBridgeDomainConf.get().getPhysicalLocationRef()) {
 212                     if (!ref.getNodeId().equals(vppNodeId)) {
 213                         LOG.debug("Node {} is not referenced node, skipping", ref.getNodeId());
 214                         continue;
 215                     }
 216                     if (ref.getInterface() != null && ref.getInterface().size() > 0) {
 217                         NodeVbridgeVlanAugment vppNodeVlanAug = new NodeVbridgeVlanAugmentBuilder()
 218                                 .setSuperInterface(ref.getInterface().get(0)).build();
 219                         Node vppNode = createBasicVppNodeBuilder(vppNodeId)
 220                                 .addAugmentation(NodeVbridgeVlanAugment.class, vppNodeVlanAug).build();
 221                         return createBridgeDomainOnVppNode(bridgeDomainName, topologyAug, vppNode);
 222                     }
 223                 }
 224             }
 225             return Futures.immediateFailedFuture(
 226                     new Throwable("Failed to apply config for VLAN bridge domain " + bridgeDomainName));
 227         }, MoreExecutors.directExecutor());
 228     }
 229
 230     /**
 231      * Method checks whether bridge domain already exists in topology under its {@link TopologyId}. If not, BD is
 232      * written into CONF DS (request for VBD) and registers listener which awaits result from VBD. Result can be
 233      * checked in OPER DS as a {@link BridgeDomainStatus}. If status is {@link BridgeDomainStatus#Started}, listener
 234      * unregisters itself and bridge domain creation in VBD is considered successful.
 235      * <p>
 236      * Next part creates request for {@link BridgeMember} in topology CONF DS and registers listener listening on
 237      * topology OPER DS. If bridge member is created in VBD, listener is closed.
 238      * <p>
 239      * This process has limited time, limit is defined in {@link ForwardingManager#WAIT_FOR_BD_PROCESSING} to prevent
 240      * stuck if VBD processing fails in some point.
 241      *
 242      * @param bridgeDomainName serving as a topology-id
 243      * @param vBridgeAug       augmented data in BD
 244      * @param vppNode          transformed into bridge member
 245      * @return composed future which serves as a marker for caller method that the computation is done. If future is
 246      * not returned in time, {@link TimeoutException} will be thrown there.
 247      */
 248     private ListenableFuture<Void> createBridgeDomainOnVppNode(@Nonnull final String bridgeDomainName,
 249                                                                @Nonnull final TopologyVbridgeAugment vBridgeAug,
 250                                                                @Nonnull final Node vppNode) {
 251         LOG.info("Creating bridge domain {} on VPP node {}", bridgeDomainName, vppNode);
 252         final TopologyKey topologyKey = new TopologyKey(new TopologyId(bridgeDomainName));
 253         final ReadOnlyTransaction rTx = dataProvider.newReadOnlyTransaction();
 254         final InstanceIdentifier<Topology> topologyIid = VppIidFactory.getTopologyIid(topologyKey);
 255         final CheckedFuture<Optional<Topology>, ReadFailedException> optTopology =
 256                 rTx.read(LogicalDatastoreType.CONFIGURATION, topologyIid);
 257         rTx.close();
 258         return Futures.transformAsync(optTopology, topologyOptional -> {
 259             // Topology
 260             Preconditions.checkNotNull(topologyOptional,
 261                 "TopologyOptional with topologyIiD: " + topologyIid + " must not be null when creating BD");
 262             final SettableFuture<Void> topologyFuture = SettableFuture.create();
 263             if (!topologyOptional.isPresent()) {
 264                 final WriteTransaction wTx = dataProvider.newWriteOnlyTransaction();
 265                 final Topology topology = new TopologyBuilder().setKey(topologyKey)
 266                         .setTopologyTypes(VBRIDGE_TOPOLOGY_TYPE)
 267                         .addAugmentation(TopologyVbridgeAugment.class, vBridgeAug)
 268                         .build();
 269                 wTx.put(LogicalDatastoreType.CONFIGURATION, topologyIid, topology, true);
 270                 Futures.addCallback(wTx.submit(), new FutureCallback<Void>() {
 271
 272                     @Override
 273                     public void onSuccess(@Nullable final Void result) {
 274                         final InstanceIdentifier<BridgeDomain> bridgeDomainStateIid =
 275                                 VppIidFactory.getBridgeDomainStateIid(new BridgeDomainKey(bridgeDomainName));
 276                         LOG.debug("Adding a listener on bridge domain state", bridgeDomainName);
 277                         final DataTreeIdentifier<BridgeDomain> bridgeDomainStateIidDTI = new DataTreeIdentifier<>(LogicalDatastoreType.OPERATIONAL,
 278                                 bridgeDomainStateIid);
 279                         new ListenableFutureSetter<>(dataProvider, topologyFuture, bridgeDomainStateIidDTI, ModificationType.WRITE);
 280                     }
 281
 282                     @Override
 283                     public void onFailure(@Nonnull Throwable t) {
 284                         LOG.warn("Request create topology for VBD was not stored to CONF DS. {}", topologyIid, t);
 285                         topologyFuture.setException(new Exception("Cannot send request to VBD."));
 286                     }
 287                 }, MoreExecutors.directExecutor());
 288             } else {
 289                 topologyFuture.set(null);
 290                 LOG.info("Bridge domain {} already exists", topologyOptional.get().getTopologyId());
 291             }
 292             return Futures.transformAsync(topologyFuture, topologyInput -> {
 293                 // Bridge member
 294                 final SettableFuture<Void> futureBridgeMember = SettableFuture.create();
 295                 final InstanceIdentifier<Node> nodeIid = VppIidFactory.getNodeIid(topologyKey, vppNode.getKey());
 296                 LOG.debug("Adding node {} to bridge domain {}", vppNode.getKey(), topologyKey.getTopologyId());
 297                 final WriteTransaction wTx = dataProvider.newWriteOnlyTransaction();
 298                 wTx.put(LogicalDatastoreType.CONFIGURATION, nodeIid, vppNode);
 299                 Futures.addCallback(wTx.submit(), new FutureCallback<Void>() {
 300
 301                     @Override
 302                     public void onSuccess(@Nullable final Void _void) {
 303                         final DataTreeIdentifier<BridgeMember> bridgeMemberIid =
 304                                 new DataTreeIdentifier<>(LogicalDatastoreType.OPERATIONAL,
 305                                         nodeIid.augmentation(NodeVbridgeAugment.class).child(BridgeMember.class));
 306                         LOG.debug("Request create node in topology for VBD was stored to CONF DS. {}", nodeIid);
 307                         new ListenableFutureSetter<>(dataProvider, futureBridgeMember, bridgeMemberIid,
 308                                 ModificationType.WRITE);
 309                     }
 310
 311                     @Override
 312                     public void onFailure(@Nonnull final Throwable t) {
 313                         LOG.warn("Request create node in topology for VBD was not stored to CONF DS. {}", nodeIid, t);
 314                         futureBridgeMember.setException(new Exception("Cannot send request to VBD."));
 315                     }
 316                 }, MoreExecutors.directExecutor());
 317                 return futureBridgeMember;
 318             }, MoreExecutors.directExecutor());
 319         }, MoreExecutors.directExecutor());
 320     }
 321
 322     @Override
 323     public ListenableFuture<Void> removeBridgeDomainFromVppNode(@Nonnull final String bridgeDomainName,
 324                                                                 @Nonnull final NodeId vppNode) {
 325         LOG.info("Removing bridge domain {} from VPP node {}", bridgeDomainName, vppNode);
 326         InstanceIdentifier<Topology> topologyIid =
 327                 VppIidFactory.getTopologyIid(new TopologyKey(new TopologyId(bridgeDomainName)));
 328         ReadOnlyTransaction rTx = dataProvider.newReadOnlyTransaction();
 329         Optional<Topology> topologyOpt =
 330                 DataStoreHelper.readFromDs(LogicalDatastoreType.CONFIGURATION, topologyIid, rTx);
 331         WriteTransaction wTx = dataProvider.newWriteOnlyTransaction();
 332         InstanceIdentifier<Node> nodeIid =
 333                 VppIidFactory.getNodeIid(new TopologyKey(new TopologyId(bridgeDomainName)), new NodeKey(vppNode));
 334         wTx.delete(LogicalDatastoreType.CONFIGURATION, nodeIid);
 335         if (topologyOpt.isPresent()) {
 336             Topology topology = topologyOpt.get();
 337             if(topology.getNode() == null || topology.getNode().size() == 1) {
 338                 wTx.delete(LogicalDatastoreType.CONFIGURATION, topologyIid);
 339             }
 340         }
 341         SettableFuture<Void> future = SettableFuture.create();
 342         Futures.addCallback(wTx.submit(), new FutureCallback<Void>() {
 343
 344             @Override
 345             public void onSuccess(Void result) {
 346                 DataTreeIdentifier<BridgeMember> bridgeMemberIid =
 347                         new DataTreeIdentifier<>(LogicalDatastoreType.OPERATIONAL,
 348                                 nodeIid.augmentation(NodeVbridgeAugment.class).child(BridgeMember.class));
 349                 LOG.debug("Request delete node in topology for VBD was stored to CONF DS. {}", nodeIid);
 350                 new ListenableFutureSetter<>(dataProvider, future, bridgeMemberIid, ModificationType.DELETE);
 351             }
 352
 353             @Override
 354             public void onFailure(@Nonnull Throwable t) {
 355                 LOG.warn("Request delete node in topology for VBD was not stored to CONF DS. {}", nodeIid, t);
 356                 future.setException(new Exception("Cannot send request to VBD."));
 357             }
 358         }, MoreExecutors.directExecutor());
 359         return future;
 360     }
 361 }