@Override
 public <KOut, VOut> Map<KOut, VOut> reduce(ReduceCommand<KOut, VOut> reduceCommand)
     throws InterruptedException {
   Cache<?, ?> cache = cacheManager.getCache(reduceCommand.getCacheName());
   Set<KOut> keys = reduceCommand.getKeys();
   String taskId = reduceCommand.getTaskId();
   Reducer<KOut, VOut> reducer = reduceCommand.getReducer();
   boolean useIntermediateKeys = reduceCommand.isEmitCompositeIntermediateKeys();
   boolean noInputKeys = keys == null || keys.isEmpty();
   Cache<Object, List<VOut>> tmpCache = cacheManager.getCache(reduceCommand.getCacheName());
   Map<KOut, VOut> result = new HashMap<KOut, VOut>();
   if (noInputKeys) {
     // illegal state, raise exception
     throw new IllegalStateException(
         "Reduce phase of MapReduceTask "
             + taskId
             + " on node "
             + cdl.getAddress()
             + " executed with empty input keys");
   } else {
     // first hook into lifecycle
     MapReduceTaskLifecycleService taskLifecycleService =
         MapReduceTaskLifecycleService.getInstance();
     log.tracef("For m/r task %s invoking %s at %s", taskId, reduceCommand, cdl.getAddress());
     int interruptCount = 0;
     long start = log.isTraceEnabled() ? timeService.time() : 0;
     try {
       taskLifecycleService.onPreExecute(reducer, cache);
       for (KOut key : keys) {
         interruptCount++;
         if (checkInterrupt(interruptCount++) && Thread.currentThread().isInterrupted())
           throw new InterruptedException();
         // load result value from map phase
         List<VOut> value;
         if (useIntermediateKeys) {
           value = tmpCache.get(new IntermediateCompositeKey<KOut>(taskId, key));
         } else {
           value = tmpCache.get(key);
         }
         // and reduce it
         VOut reduced = reducer.reduce(key, value.iterator());
         result.put(key, reduced);
         log.tracef(
             "For m/r task %s reduced %s to %s at %s ", taskId, key, reduced, cdl.getAddress());
       }
     } finally {
       if (log.isTraceEnabled()) {
         log.tracef(
             "Reduce for task %s took %s milliseconds",
             reduceCommand.getTaskId(), timeService.timeDuration(start, TimeUnit.MILLISECONDS));
       }
       taskLifecycleService.onPostExecute(reducer);
     }
   }
   return result;
 }
  /** @param isRemote true if the command is deserialized and is executed remote. */
  @Override
  public void initializeReplicableCommand(ReplicableCommand c, boolean isRemote) {
    if (c == null) return;
    switch (c.getCommandId()) {
      case PutKeyValueCommand.COMMAND_ID:
        ((PutKeyValueCommand) c).init(notifier, configuration);
        break;
      case ReplaceCommand.COMMAND_ID:
        ((ReplaceCommand) c).init(notifier, configuration);
        break;
      case PutMapCommand.COMMAND_ID:
        ((PutMapCommand) c).init(notifier);
        break;
      case RemoveCommand.COMMAND_ID:
        ((RemoveCommand) c).init(notifier, configuration);
        break;
      case MultipleRpcCommand.COMMAND_ID:
        MultipleRpcCommand rc = (MultipleRpcCommand) c;
        rc.init(interceptorChain, icf);
        if (rc.getCommands() != null)
          for (ReplicableCommand nested : rc.getCommands()) {
            initializeReplicableCommand(nested, false);
          }
        break;
      case SingleRpcCommand.COMMAND_ID:
        SingleRpcCommand src = (SingleRpcCommand) c;
        src.init(interceptorChain, icf);
        if (src.getCommand() != null) initializeReplicableCommand(src.getCommand(), false);

        break;
      case InvalidateCommand.COMMAND_ID:
        InvalidateCommand ic = (InvalidateCommand) c;
        ic.init(notifier, configuration);
        break;
      case InvalidateL1Command.COMMAND_ID:
        InvalidateL1Command ilc = (InvalidateL1Command) c;
        ilc.init(configuration, distributionManager, notifier, dataContainer);
        break;
      case PrepareCommand.COMMAND_ID:
      case VersionedPrepareCommand.COMMAND_ID:
      case TotalOrderNonVersionedPrepareCommand.COMMAND_ID:
      case TotalOrderVersionedPrepareCommand.COMMAND_ID:
        PrepareCommand pc = (PrepareCommand) c;
        pc.init(interceptorChain, icf, txTable);
        pc.initialize(notifier, recoveryManager);
        if (pc.getModifications() != null)
          for (ReplicableCommand nested : pc.getModifications()) {
            initializeReplicableCommand(nested, false);
          }
        pc.markTransactionAsRemote(isRemote);
        if (configuration.deadlockDetection().enabled() && isRemote) {
          DldGlobalTransaction transaction = (DldGlobalTransaction) pc.getGlobalTransaction();
          transaction.setLocksHeldAtOrigin(pc.getAffectedKeys());
        }
        break;
      case CommitCommand.COMMAND_ID:
      case VersionedCommitCommand.COMMAND_ID:
      case TotalOrderCommitCommand.COMMAND_ID:
      case TotalOrderVersionedCommitCommand.COMMAND_ID:
        CommitCommand commitCommand = (CommitCommand) c;
        commitCommand.init(interceptorChain, icf, txTable);
        commitCommand.markTransactionAsRemote(isRemote);
        break;
      case RollbackCommand.COMMAND_ID:
      case TotalOrderRollbackCommand.COMMAND_ID:
        RollbackCommand rollbackCommand = (RollbackCommand) c;
        rollbackCommand.init(interceptorChain, icf, txTable);
        rollbackCommand.markTransactionAsRemote(isRemote);
        break;
      case ClearCommand.COMMAND_ID:
        ClearCommand cc = (ClearCommand) c;
        cc.init(notifier, dataContainer);
        break;
      case ClusteredGetCommand.COMMAND_ID:
        ClusteredGetCommand clusteredGetCommand = (ClusteredGetCommand) c;
        clusteredGetCommand.initialize(
            icf,
            this,
            entryFactory,
            interceptorChain,
            distributionManager,
            txTable,
            configuration.dataContainer().keyEquivalence());
        break;
      case LockControlCommand.COMMAND_ID:
        LockControlCommand lcc = (LockControlCommand) c;
        lcc.init(interceptorChain, icf, txTable);
        lcc.markTransactionAsRemote(isRemote);
        if (configuration.deadlockDetection().enabled() && isRemote) {
          DldGlobalTransaction gtx = (DldGlobalTransaction) lcc.getGlobalTransaction();
          RemoteTransaction transaction = txTable.getRemoteTransaction(gtx);
          if (transaction != null) {
            if (!configuration.clustering().cacheMode().isDistributed()) {
              Set<Object> keys = txTable.getLockedKeysForRemoteTransaction(gtx);
              GlobalTransaction gtx2 = transaction.getGlobalTransaction();
              ((DldGlobalTransaction) gtx2).setLocksHeldAtOrigin(keys);
              gtx.setLocksHeldAtOrigin(keys);
            } else {
              GlobalTransaction gtx2 = transaction.getGlobalTransaction();
              ((DldGlobalTransaction) gtx2).setLocksHeldAtOrigin(gtx.getLocksHeldAtOrigin());
            }
          }
        }
        break;
      case StateRequestCommand.COMMAND_ID:
        ((StateRequestCommand) c).init(stateProvider);
        break;
      case StateResponseCommand.COMMAND_ID:
        ((StateResponseCommand) c).init(stateConsumer);
        break;
      case GetInDoubtTransactionsCommand.COMMAND_ID:
        GetInDoubtTransactionsCommand gptx = (GetInDoubtTransactionsCommand) c;
        gptx.init(recoveryManager);
        break;
      case TxCompletionNotificationCommand.COMMAND_ID:
        TxCompletionNotificationCommand ftx = (TxCompletionNotificationCommand) c;
        ftx.init(txTable, lockManager, recoveryManager, stateTransferManager);
        break;
      case MapCombineCommand.COMMAND_ID:
        MapCombineCommand mrc = (MapCombineCommand) c;
        mrc.init(mapReduceManager);
        break;
      case ReduceCommand.COMMAND_ID:
        ReduceCommand reduceCommand = (ReduceCommand) c;
        reduceCommand.init(mapReduceManager);
        break;
      case DistributedExecuteCommand.COMMAND_ID:
        DistributedExecuteCommand dec = (DistributedExecuteCommand) c;
        dec.init(cache);
        break;
      case GetInDoubtTxInfoCommand.COMMAND_ID:
        GetInDoubtTxInfoCommand gidTxInfoCommand = (GetInDoubtTxInfoCommand) c;
        gidTxInfoCommand.init(recoveryManager);
        break;
      case CompleteTransactionCommand.COMMAND_ID:
        CompleteTransactionCommand ccc = (CompleteTransactionCommand) c;
        ccc.init(recoveryManager);
        break;
      case ApplyDeltaCommand.COMMAND_ID:
        break;
      case CreateCacheCommand.COMMAND_ID:
        CreateCacheCommand createCacheCommand = (CreateCacheCommand) c;
        createCacheCommand.init(cache.getCacheManager());
        break;
      case XSiteAdminCommand.COMMAND_ID:
        XSiteAdminCommand xSiteAdminCommand = (XSiteAdminCommand) c;
        xSiteAdminCommand.init(backupSender);
        break;
      case CancelCommand.COMMAND_ID:
        CancelCommand cancelCommand = (CancelCommand) c;
        cancelCommand.init(cancellationService);
        break;
      case XSiteStateTransferControlCommand.COMMAND_ID:
        XSiteStateTransferControlCommand xSiteStateTransferControlCommand =
            (XSiteStateTransferControlCommand) c;
        xSiteStateTransferControlCommand.initialize(
            xSiteStateProvider, xSiteStateConsumer, xSiteStateTransferManager);
        break;
      case XSiteStatePushCommand.COMMAND_ID:
        XSiteStatePushCommand xSiteStatePushCommand = (XSiteStatePushCommand) c;
        xSiteStatePushCommand.initialize(xSiteStateConsumer);
        break;
      case EntryRequestCommand.COMMAND_ID:
        EntryRequestCommand entryRequestCommand = (EntryRequestCommand) c;
        entryRequestCommand.init(entryRetriever);
        break;
      case EntryResponseCommand.COMMAND_ID:
        EntryResponseCommand entryResponseCommand = (EntryResponseCommand) c;
        entryResponseCommand.init(entryRetriever);
        break;
      case GetKeysInGroupCommand.COMMAND_ID:
        GetKeysInGroupCommand getKeysInGroupCommand = (GetKeysInGroupCommand) c;
        getKeysInGroupCommand.setGroupManager(groupManager);
        break;
      case ClusteredGetAllCommand.COMMAND_ID:
        ClusteredGetAllCommand clusteredGetAllCommand = (ClusteredGetAllCommand) c;
        clusteredGetAllCommand.init(
            icf,
            this,
            entryFactory,
            interceptorChain,
            txTable,
            configuration.dataContainer().keyEquivalence());
        break;
      case StreamRequestCommand.COMMAND_ID:
        StreamRequestCommand streamRequestCommand = (StreamRequestCommand) c;
        streamRequestCommand.inject(localStreamManager);
        break;
      case StreamResponseCommand.COMMAND_ID:
        StreamResponseCommand streamResponseCommand = (StreamResponseCommand) c;
        streamResponseCommand.inject(clusterStreamManager);
        break;
      case StreamSegmentResponseCommand.COMMAND_ID:
        StreamSegmentResponseCommand streamSegmentResponseCommand =
            (StreamSegmentResponseCommand) c;
        streamSegmentResponseCommand.inject(clusterStreamManager);
        break;
      case RemoveExpiredCommand.COMMAND_ID:
        RemoveExpiredCommand removeExpiredCommand = (RemoveExpiredCommand) c;
        removeExpiredCommand.init(notifier, configuration);
        break;
      default:
        ModuleCommandInitializer mci = moduleCommandInitializers.get(c.getCommandId());
        if (mci != null) {
          mci.initializeReplicableCommand(c, isRemote);
        } else {
          if (trace) log.tracef("Nothing to initialize for command: %s", c);
        }
    }
  }