elanmanager/api/src/main/java/org/opendaylight/netvirt/elan/arp/responder/ArpResponderUtil.java

   1 /*
   2  * Copyright © 2016, 2017 Ericsson India Global Services Pvt Ltd. 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 package org.opendaylight.netvirt.elan.arp.responder;
   9
  10 import java.math.BigInteger;
  11 import java.text.MessageFormat;
  12 import java.util.ArrayList;
  13 import java.util.Arrays;
  14 import java.util.Collections;
  15 import java.util.List;
  16 import java.util.concurrent.ExecutionException;
  17 import java.util.concurrent.Future;
  18 import java.util.concurrent.atomic.AtomicInteger;
  19 import java.util.function.Supplier;
  20 import java.util.stream.Collectors;
  21
  22 import org.opendaylight.genius.interfacemanager.interfaces.IInterfaceManager;
  23 import org.opendaylight.genius.mdsalutil.ActionInfo;
  24 import org.opendaylight.genius.mdsalutil.BucketInfo;
  25 import org.opendaylight.genius.mdsalutil.FlowEntity;
  26 import org.opendaylight.genius.mdsalutil.GroupEntity;
  27 import org.opendaylight.genius.mdsalutil.InstructionInfo;
  28 import org.opendaylight.genius.mdsalutil.MDSALUtil;
  29 import org.opendaylight.genius.mdsalutil.MatchInfo;
  30 import org.opendaylight.genius.mdsalutil.MetaDataUtil;
  31 import org.opendaylight.genius.mdsalutil.NwConstants;
  32 import org.opendaylight.genius.mdsalutil.actions.ActionDrop;
  33 import org.opendaylight.genius.mdsalutil.actions.ActionLoadIpToSpa;
  34 import org.opendaylight.genius.mdsalutil.actions.ActionLoadMacToSha;
  35 import org.opendaylight.genius.mdsalutil.actions.ActionMoveShaToTha;
  36 import org.opendaylight.genius.mdsalutil.actions.ActionMoveSourceDestinationEth;
  37 import org.opendaylight.genius.mdsalutil.actions.ActionMoveSpaToTpa;
  38 import org.opendaylight.genius.mdsalutil.actions.ActionNxLoadInPort;
  39 import org.opendaylight.genius.mdsalutil.actions.ActionNxResubmit;
  40 import org.opendaylight.genius.mdsalutil.actions.ActionSetArpOp;
  41 import org.opendaylight.genius.mdsalutil.actions.ActionSetFieldEthernetSource;
  42 import org.opendaylight.genius.mdsalutil.instructions.InstructionApplyActions;
  43 import org.opendaylight.genius.mdsalutil.instructions.InstructionGotoTable;
  44 import org.opendaylight.genius.mdsalutil.interfaces.IMdsalApiManager;
  45 import org.opendaylight.genius.mdsalutil.matches.MatchArpOp;
  46 import org.opendaylight.genius.mdsalutil.matches.MatchArpTpa;
  47 import org.opendaylight.genius.mdsalutil.matches.MatchEthernetType;
  48 import org.opendaylight.genius.mdsalutil.matches.MatchMetadata;
  49 import org.opendaylight.netvirt.elanmanager.api.ElanHelper;
  50 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.yang.types.rev130715.MacAddress;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.action.list.Action;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.inventory.rev130819.tables.table.Flow;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.flow.types.rev131026.instruction.list.Instruction;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.idmanager.rev160406.AllocateIdInput;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.idmanager.rev160406.AllocateIdInputBuilder;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.idmanager.rev160406.AllocateIdOutput;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.idmanager.rev160406.IdManagerService;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rpcs.rev160406.GetEgressActionsForTunnelInputBuilder;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rpcs.rev160406.GetEgressActionsForTunnelOutput;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.genius.itm.rpcs.rev160406.ItmRpcService;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.group.types.rev131018.GroupTypes;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.netvirt.elan.rev150602.elan.instances.ElanInstance;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.openflowplugin.extension.nicira.action.rev140714.add.group.input.buckets.bucket.action.action.NxActionResubmitRpcAddGroupCase;
  64 import org.opendaylight.yangtools.yang.common.RpcResult;
  65 import org.slf4j.Logger;
  66 import org.slf4j.LoggerFactory;
  67
  68 /**
  69  * Arp Responder Utility Class.
  70  */
  71 public final class ArpResponderUtil {
  72
  73     private static final Logger LOG = LoggerFactory.getLogger(ArpResponderUtil.class);
  74
  75     private static final long WAIT_TIME_FOR_SYNC_INSTALL = Long.getLong("wait.time.sync.install", 300L);
  76
  77     /**
  78      * A Utility class.
  79      */
  80     private ArpResponderUtil() {
  81     }
  82
  83     /**
  84      * Install Group flow on the DPN.
  85      *
  86      * @param mdSalManager
  87      *            Reference of MDSAL API RPC that provides API for installing
  88      *            group flow
  89      * @param dpnId
  90      *            DPN on which group flow to be installed
  91      * @param groupdId
  92      *            Uniquely identifiable Group Id for the group flow
  93      * @param groupName
  94      *            Name of the group flow
  95      * @param buckets
  96      *            List of the bucket actions for the group flow
  97      */
  98     public static void installGroup(IMdsalApiManager mdSalManager, BigInteger dpnId, long groupdId, String groupName,
  99             List<BucketInfo> buckets) {
 100         LOG.trace("Installing group flow on dpn {}", dpnId);
 101         GroupEntity groupEntity = MDSALUtil.buildGroupEntity(dpnId, groupdId, groupName, GroupTypes.GroupAll, buckets);
 102         mdSalManager.syncInstallGroup(groupEntity);
 103         try {
 104             Thread.sleep(WAIT_TIME_FOR_SYNC_INSTALL);
 105         } catch (InterruptedException e1) {
 106             LOG.warn("Error while waiting for ARP Responder Group Entry to be installed on DPN {} ", dpnId);
 107         }
 108     }
 109
 110     /**
 111      * Get Default ARP Responder Drop flow on the DPN.
 112      *
 113      * @param dpnId
 114      *            DPN on which group flow to be installed
 115      */
 116     public static FlowEntity getArpResponderTableMissFlow(BigInteger dpnId) {
 117         return MDSALUtil.buildFlowEntity(dpnId, NwConstants.ARP_RESPONDER_TABLE,
 118                 String.valueOf(NwConstants.ARP_RESPONDER_TABLE), NwConstants.TABLE_MISS_PRIORITY,
 119                 ArpResponderConstant.DROP_FLOW_NAME.value(), 0, 0, NwConstants.COOKIE_ARP_RESPONDER,
 120                 new ArrayList<MatchInfo>(),
 121                 Collections.singletonList(new InstructionApplyActions(Collections.singletonList(new ActionDrop()))));
 122     }
 123
 124     /**
 125      * Get Bucket Actions for ARP Responder Group Flow.
 126      *
 127      * <p>
 128      * Install Default Groups, Group has 1 Bucket
 129      * </p>
 130      * <ul>
 131      * <li>Resubmit to Table {@link NwConstants#ARP_RESPONDER_TABLE}, for ARP
 132      * Auto response from DPN itself</li>
 133      * </ul>
 134      *
 135      * @param resubmitTableId
 136      *            Resubmit Flow Table Id
 137      * @return List of bucket actions
 138      */
 139     public static List<BucketInfo> getDefaultBucketInfos(short resubmitTableId) {
 140         return Arrays.asList(
 141                 new BucketInfo(Collections.singletonList(new ActionNxResubmit(resubmitTableId))));
 142     }
 143
 144     /**
 145      * Get Match Criteria for the ARP Responder Flow.
 146      *
 147      * <p>
 148      * List of Match Criteria for ARP Responder
 149      * </p>
 150      * <ul>
 151      * <li>Packet is ARP</li>
 152      * <li>Packet is ARP Request</li>
 153      * <li>The ARP packet is requesting for Gateway IP</li>
 154      * <li>Metadata which is generated by using Service
 155      * Index({@link NwConstants#L3VPN_SERVICE_INDEX}) Lport Tag
 156      * ({@link MetaDataUtil#METADATA_MASK_LPORT_TAG}) and VRF
 157      * ID({@link MetaDataUtil#METADATA_MASK_VRFID})</li>
 158      * </ul>
 159      *
 160      * @param lportTag
 161      *            LPort Tag
 162      * @param elanInstance
 163      *            Elan Instance
 164      * @param ipAddress
 165      *            Ip Address to be matched to this flow
 166      * @return List of Match criteria
 167      */
 168     public static List<MatchInfo> getMatchCriteria(int lportTag, ElanInstance elanInstance,
 169             String ipAddress) {
 170
 171         BigInteger metadata = ElanHelper.getElanMetadataLabel(elanInstance.getElanTag(), lportTag);
 172         BigInteger metadataMask = ElanHelper.getElanMetadataMask();
 173         return Arrays.asList(MatchEthernetType.ARP, MatchArpOp.REQUEST, new MatchArpTpa(ipAddress, "32"),
 174                 new MatchMetadata(metadata, metadataMask));
 175
 176     }
 177
 178     /**
 179      * Get List of actions for ARP Responder Flows.
 180      *
 181      * <p>
 182      * Actions consists of all the ARP actions and Resubmit Action to table
 183      * {@link NwConstants#ELAN_BASE_TABLE} such that packets can flow ELAN Rule
 184      *
 185      * @param ipAddress
 186      *            IP Address for which ARP Response packet is to be generated
 187      * @param macAddress
 188      *            MacAddress for which ARP Response packet is to be generated
 189      * @return List of ARP Responder Actions actions
 190      */
 191     public static List<Action> getActions(IInterfaceManager ifaceMgrRpcService, ItmRpcService itmRpcService,
 192                                           String ifName, String ipAddress, String macAddress,
 193                                           boolean isTunnelInterface) {
 194
 195         AtomicInteger actionCounter = new AtomicInteger();
 196         List<Action> actions = arpActions.apply(actionCounter, macAddress, ipAddress);
 197         actions.addAll(getEgressActionsForInterface(ifaceMgrRpcService, itmRpcService, ifName, actionCounter.get(),
 198                 isTunnelInterface));
 199         LOG.trace("Total Number of actions is {}", actionCounter);
 200         return actions;
 201
 202     }
 203
 204     /**
 205      * A Interface that represent lambda TriFunction.
 206      *
 207      * @param <T>
 208      *            Input type
 209      * @param <U>
 210      *            Input type
 211      * @param <S>
 212      *            Input type
 213      * @param <R>
 214      *            Return Type
 215      */
 216     @SuppressWarnings("checkstyle:ParameterName")
 217     public interface TriFunction<T, U, S, R> {
 218         /**
 219          * Apply the Action.
 220          *
 221          * @param t
 222          *            Input1
 223          * @param u
 224          *            Input2
 225          * @param s
 226          *            Input3
 227          * @return computed result
 228          */
 229         R apply(T t, U u, S s);
 230     }
 231
 232     /**
 233      * Lambda to apply arpAction. Inputs action counter, mac address and ip
 234      * address
 235      */
 236     private static TriFunction<AtomicInteger, String, String, List<Action>> arpActions = (actionCounter, mac, ip) -> {
 237         List<Action> actions = new ArrayList<>();
 238         Collections.addAll(actions, new ActionMoveSourceDestinationEth().buildAction(actionCounter.getAndIncrement()),
 239                 new ActionSetFieldEthernetSource(new MacAddress(mac)).buildAction(actionCounter.getAndIncrement()),
 240                 new ActionSetArpOp(NwConstants.ARP_REPLY).buildAction(actionCounter.getAndIncrement()),
 241                 new ActionMoveShaToTha().buildAction(actionCounter.getAndIncrement()),
 242                 new ActionMoveSpaToTpa().buildAction(actionCounter.getAndIncrement()),
 243                 new ActionLoadMacToSha(new MacAddress(mac)).buildAction(actionCounter.getAndIncrement()),
 244                 new ActionLoadIpToSpa(ip).buildAction(actionCounter.getAndIncrement()),
 245                 new ActionNxLoadInPort(BigInteger.ZERO).buildAction(actionCounter.getAndIncrement()));
 246         return actions;
 247
 248     };
 249
 250     /**
 251      * Get instruction list for ARP responder flows.
 252      */
 253     public static List<Instruction> getInterfaceInstructions(IInterfaceManager ifaceMgrRpcService, String interfaceName,
 254             String ipAddress, String macAddress, ItmRpcService itmRpcService) {
 255         List<Action> actions = ArpResponderUtil.getActions(ifaceMgrRpcService, itmRpcService, interfaceName, ipAddress,
 256                 macAddress, false);
 257         return Collections.singletonList(MDSALUtil.buildApplyActionsInstruction(actions));
 258     }
 259
 260     /**
 261      * Get instruction list for ARP responder flows originated from ext-net e.g.
 262      * router-gw/fip.<br>
 263      * The split-horizon bit should be reset in order to allow traffic from
 264      * provider network to be routed back to flat/VLAN network and override the
 265      * egress table drop flow.<br>
 266      * In order to allow write-metadata in the ARP responder table the resubmit
 267      * action needs to be replaced with goto instruction.
 268      */
 269     public static List<Instruction> getExtInterfaceInstructions(IInterfaceManager ifaceMgrRpcService,
 270                                                                 ItmRpcService itmRpcService,
 271                                                                 String extInterfaceName, String ipAddress,
 272                                                                 String macAddress) {
 273         AtomicInteger tableId = new AtomicInteger(-1);
 274         List<Instruction> instructions = new ArrayList<>();
 275         List<Action> actions = getActions(ifaceMgrRpcService, itmRpcService, extInterfaceName, ipAddress, macAddress,
 276                 false);
 277         actions.removeIf(v -> {
 278             org.opendaylight.yang.gen.v1.urn.opendaylight.action.types.rev131112.action.Action actionClass = v
 279                     .getAction();
 280             if (actionClass instanceof NxActionResubmitRpcAddGroupCase) {
 281                 tableId.set(((NxActionResubmitRpcAddGroupCase) actionClass).getNxResubmit().getTable());
 282                 return true;
 283             } else {
 284                 return false;
 285             }
 286         });
 287
 288         instructions.add(MDSALUtil.buildApplyActionsInstruction(actions, 0));
 289
 290         if (tableId.get() != -1) {
 291             // replace resubmit action with goto so it can co-exist with
 292             // write-metadata
 293             if ((short) tableId.get() > NwConstants.ARP_RESPONDER_TABLE) {
 294                 instructions.add(new InstructionGotoTable((short) tableId.get()).buildInstruction(2));
 295             } else {
 296                 LOG.warn("Failed to insall responder flow for interface {}. Resubmit to {} can't be replaced with goto",
 297                         extInterfaceName, tableId);
 298             }
 299         }
 300
 301         return instructions;
 302     }
 303
 304     /**
 305      * Install ARP Responder FLOW.
 306      *
 307      * @param mdSalManager
 308      *            Reference of MDSAL API RPC that provides API for installing
 309      *            flow
 310      * @param dpnId
 311      *            DPN on which flow to be installed
 312      * @param flowId
 313      *            Uniquely Identifiable Arp Responder Table flow Id
 314      * @param flowName
 315      *            Readable flow name
 316      * @param priority
 317      *            Flow Priority
 318      * @param cookie
 319      *            Flow Cookie
 320      * @param matches
 321      *            List of Match Criteria for the flow
 322      * @param instructions
 323      *            List of Instructions for the flow
 324      */
 325     public static void installFlow(IMdsalApiManager mdSalManager, BigInteger dpnId, String flowId, String flowName,
 326             int priority, BigInteger cookie, List<MatchInfo> matches, List<Instruction> instructions) {
 327         Flow flowEntity = MDSALUtil.buildFlowNew(NwConstants.ARP_RESPONDER_TABLE, flowId, priority, flowName, 0, 0,
 328                 cookie, matches, instructions);
 329         mdSalManager.installFlow(dpnId, flowEntity);
 330     }
 331
 332     /**
 333      * Remove flow form DPN.
 334      *
 335      * @param mdSalManager
 336      *            Reference of MDSAL API RPC that provides API for installing
 337      *            flow
 338      * @param dpnId
 339      *            DPN form which flow to be removed
 340      * @param flowId
 341      *            Uniquely Identifiable Arp Responder Table flow Id that is to
 342      *            be removed
 343      */
 344     public static void removeFlow(IMdsalApiManager mdSalManager, BigInteger dpnId, String flowId) {
 345         Flow flowEntity = MDSALUtil.buildFlow(NwConstants.ARP_RESPONDER_TABLE, flowId);
 346         mdSalManager.removeFlow(dpnId, flowEntity);
 347     }
 348
 349     /**
 350      * Creates Uniquely Identifiable flow Id.
 351      *
 352      * @param lportTag
 353      *            LportTag of the flow
 354      * @param ipAdress
 355      *            Gateway IP for which ARP Response flow to be installed
 356      * @return Unique Flow Id
 357      *
 358      * @see ArpResponderConstant#FLOW_ID_FORMAT_WITH_LPORT
 359      * @see ArpResponderConstant#FLOW_ID_FORMAT_WITHOUT_LPORT
 360      */
 361     public static String getFlowId(int lportTag, String ipAdress) {
 362         return MessageFormat.format(ArpResponderConstant.FLOW_ID_FORMAT_WITH_LPORT.value(),
 363                         NwConstants.ARP_RESPONDER_TABLE, lportTag, ipAdress);
 364     }
 365
 366     /**
 367      * Generate Cookie per flow.
 368      *
 369      * <p>
 370      * Cookie is generated by Summation of
 371      * {@link NwConstants#COOKIE_ARP_RESPONDER} + 1 + lportTag + Gateway IP
 372      *
 373      * @param lportTag
 374      *            Lport Tag of the flow
 375      * @param ipAddress
 376      *            Gateway IP for which ARP Response flow to be installed
 377      * @return Cookie
 378      */
 379     public static BigInteger generateCookie(int lportTag, String ipAddress) {
 380         LOG.trace("IPAddress in long {}", ipAddress);
 381         BigInteger cookie = NwConstants.COOKIE_ARP_RESPONDER.add(BigInteger.valueOf(255))
 382                 .add(BigInteger.valueOf(ipTolong(ipAddress)));
 383         return cookie.add(BigInteger.valueOf(lportTag));
 384     }
 385
 386     private static BigInteger buildCookie(short tableId, int arpOpType) {
 387         return NwConstants.COOKIE_ARP_RESPONDER.add(BigInteger.ONE).add(
 388                 BigInteger.valueOf(tableId).add(BigInteger.valueOf(arpOpType)));
 389     }
 390
 391     private static String buildFlowRef(short tableId, int arpOpType) {
 392         return (tableId == NwConstants.ARP_CHECK_TABLE
 393                 ? ArpResponderConstant.FLOWID_PREFIX_FOR_ARP_CHECK.value()
 394                 : ArpResponderConstant.FLOWID_PREFIX_FOR_MY_GW_MAC.value()) + tableId + NwConstants.FLOWID_SEPARATOR
 395                 + (arpOpType == NwConstants.ARP_REQUEST ? "arp.request" : "arp.replay");
 396     }
 397
 398     public static FlowEntity createArpDefaultFlow(BigInteger dpId, short tableId, int arpOpType,
 399             Supplier<List<MatchInfo>> matches, Supplier<List<ActionInfo>> actions) {
 400
 401         List<InstructionInfo> instructions = Collections.singletonList(new InstructionApplyActions(actions.get()));
 402         return MDSALUtil.buildFlowEntity(dpId, tableId, buildFlowRef(tableId, arpOpType),
 403                 NwConstants.DEFAULT_ARP_FLOW_PRIORITY, buildFlowRef(tableId, arpOpType), 0, 0,
 404                 buildCookie(tableId, arpOpType), matches.get(), instructions);
 405     }
 406
 407     /**
 408      * Get IP Address in Long from String.
 409      *
 410      * @param address
 411      *            IP Address that to be converted to long
 412      * @return Long value of the IP Address
 413      */
 414     private static long ipTolong(String address) {
 415
 416         // Parse IP parts into an int array
 417         long[] ip = new long[4];
 418         String[] parts = address.split("\\.");
 419
 420         for (int i = 0; i < 4; i++) {
 421             ip[i] = Long.parseLong(parts[i]);
 422         }
 423         // Add the above IP parts into an int number representing your IP
 424         // in a 32-bit binary form
 425         long ipNumbers = 0;
 426         for (int i = 0; i < 4; i++) {
 427             ipNumbers += ip[i] << (24 - (8 * i));
 428         }
 429         return ipNumbers;
 430
 431     }
 432
 433     /**
 434      * Get List of Egress Action for the VPN interface.
 435      *
 436      * @param ifaceMgrRpcService
 437      *            Interface Manager RPC reference that invokes API to retrieve
 438      *            Egress Action
 439      * @param ifName
 440      *            VPN Interface for which Egress Action to be retrieved
 441      * @param actionCounter
 442      *            Action Key
 443      * @return List of Egress Actions
 444      */
 445     public static List<Action> getEgressActionsForInterface(IInterfaceManager ifaceMgrRpcService,
 446                                                             ItmRpcService itmRpcService, String ifName,
 447                                                             int actionCounter, boolean isTunnelInterface) {
 448         if (isTunnelInterface && ifaceMgrRpcService.isItmDirectTunnelsEnabled()) {
 449             try {
 450                 RpcResult result = itmRpcService.getEgressActionsForTunnel(new GetEgressActionsForTunnelInputBuilder()
 451                         .setIntfName(ifName).build()).get();
 452                 List<Action> listActions = new ArrayList<>();
 453                 if (!result.isSuccessful()) {
 454                     LOG.error("getEgressActionsForInterface: RPC Call to Get egress actions for interface {} "
 455                             + "returned with Errors {}", ifName, result.getErrors());
 456                 } else {
 457                     listActions = ((GetEgressActionsForTunnelOutput) result.getResult()).getAction();
 458                 }
 459                 return listActions;
 460             } catch (InterruptedException | ExecutionException e) {
 461                 LOG.error("getEgressActionsForInterface: Exception when egress actions for interface {}", ifName, e);
 462             }
 463         } else {
 464             List<ActionInfo> actionInfos = ifaceMgrRpcService.getInterfaceEgressActions(ifName);
 465             AtomicInteger counter = new AtomicInteger(actionCounter);
 466             return actionInfos.stream().map(v -> v.buildAction(counter.getAndIncrement())).collect(Collectors.toList());
 467         }
 468         return Collections.emptyList();
 469     }
 470
 471     /**
 472      * Uses the IdManager to retrieve ARP Responder GroupId from ELAN pool.
 473      *
 474      * @param idManager
 475      *            the id manager
 476      * @return the integer
 477      */
 478     public static Long retrieveStandardArpResponderGroupId(IdManagerService idManager) {
 479
 480         AllocateIdInput getIdInput = new AllocateIdInputBuilder()
 481                 .setPoolName(ArpResponderConstant.ELAN_ID_POOL_NAME.value())
 482                 .setIdKey(ArpResponderConstant.ARP_RESPONDER_GROUP_ID.value()).build();
 483
 484         try {
 485             Future<RpcResult<AllocateIdOutput>> result = idManager.allocateId(getIdInput);
 486             RpcResult<AllocateIdOutput> rpcResult = result.get();
 487             if (rpcResult.isSuccessful()) {
 488                 LOG.trace("Retrieved Group Id is {}", rpcResult.getResult().getIdValue());
 489                 return rpcResult.getResult().getIdValue();
 490             } else {
 491                 LOG.warn("RPC Call to Allocate Id returned with Errors {}", rpcResult.getErrors());
 492             }
 493         } catch (InterruptedException | ExecutionException e) {
 494             LOG.warn("Exception when Allocating Id", e);
 495         }
 496         return 0L;
 497     }
 498
 499 }