Added comments at new functions.

Fault tolerant based on events, now it is totally event driven.
Logs with INFO scope.
Romoved comment from OFChannelHandler to show logs again.

floodlightdefault.properties2 renamed to floodlightBackupNode.properties

:)

src/main/java/org/sdnplatform/sync/ISyncService.java

 package org.sdnplatform.sync;
 
-import java.util.HashMap;
+import net.floodlightcontroller.core.module.IFloodlightService;
 
 import org.sdnplatform.sync.error.SyncException;
 import org.sdnplatform.sync.error.UnknownStoreException;
-import org.sdnplatform.sync.internal.config.ClusterConfig;
 import org.sdnplatform.sync.internal.rpc.IRPCListener;
 
-
-import com.fasterxml.jackson.databind.JsonNode;
 import com.fasterxml.jackson.core.type.TypeReference;
-
-
-import net.floodlightcontroller.core.module.IFloodlightService;
+import com.fasterxml.jackson.databind.JsonNode;
 
 /**
  * The sync service provides a high-performance in-memory database for

src/main/java/org/sdnplatform/sync/internal/SyncManager.java

@@ -6,14 +6,11 @@ import io.netty.util.Timer;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
-import java.util.HashMap;
-import java.util.Iterator;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
 import java.util.Random;
-import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
@@ -21,13 +18,19 @@ import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
-import com.fasterxml.jackson.core.type.TypeReference;
+import net.floodlightcontroller.core.module.FloodlightModuleContext;
+import net.floodlightcontroller.core.module.FloodlightModuleException;
+import net.floodlightcontroller.core.module.IFloodlightService;
+import net.floodlightcontroller.core.util.SingletonTask;
+import net.floodlightcontroller.debugcounter.IDebugCounter;
+import net.floodlightcontroller.debugcounter.IDebugCounterService;
+import net.floodlightcontroller.storage.IStorageSourceService;
+import net.floodlightcontroller.threadpool.IThreadPoolService;
 
 import org.sdnplatform.sync.IClosableIterator;
 import org.sdnplatform.sync.ISyncService;
-import org.sdnplatform.sync.Versioned;
 import org.sdnplatform.sync.IVersion.Occurred;
+import org.sdnplatform.sync.Versioned;
 import org.sdnplatform.sync.error.PersistException;
 import org.sdnplatform.sync.error.SyncException;
 import org.sdnplatform.sync.error.SyncRuntimeException;
@@ -50,22 +53,16 @@ import org.sdnplatform.sync.internal.store.MappingStoreListener;
 import org.sdnplatform.sync.internal.store.SynchronizingStorageEngine;
 import org.sdnplatform.sync.internal.util.ByteArray;
 import org.sdnplatform.sync.internal.version.VectorClock;
-import org.sdnplatform.sync.thrift.SyncMessage;
 import org.sdnplatform.sync.thrift.KeyedValues;
 import org.sdnplatform.sync.thrift.KeyedVersions;
+import org.sdnplatform.sync.thrift.SyncMessage;
 import org.sdnplatform.sync.thrift.SyncOfferMessage;
 import org.sdnplatform.sync.thrift.SyncValueMessage;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import net.floodlightcontroller.core.module.FloodlightModuleContext;
-import net.floodlightcontroller.core.module.FloodlightModuleException;
-import net.floodlightcontroller.core.module.IFloodlightService;
-import net.floodlightcontroller.core.util.SingletonTask;
-import net.floodlightcontroller.debugcounter.IDebugCounter;
-import net.floodlightcontroller.debugcounter.IDebugCounterService;
-import net.floodlightcontroller.storage.IStorageSourceService;
-import net.floodlightcontroller.threadpool.IThreadPoolService;
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
 
 
 /**
@@ -468,7 +465,6 @@ public class SyncManager extends AbstractSyncManager {
 		debugCounter = context.getServiceImpl(IDebugCounterService.class);
 		Map<String, String> config = context.getConfigParams(this);
 		storeRegistry = new StoreRegistry(this, config.get("dbPath"));
-		//context.addService(IRPCService.class, this);
 
 		String[] configProviders =
 			{PropertyCCProvider.class.getName(),
@@ -819,13 +815,23 @@ public class SyncManager extends AbstractSyncManager {
 		}
 	}
 
+	
+	/**
+	 * Add a listener to RPC connections on cluster.
+	 * The listener is dispatched at connect or disconnect events. 
+	 * Can be used to monitor connections or disconnections on cluster configs.
+	 */
 	@Override
 	public void addRPCListener(IRPCListener listener) {
 		// TODO Auto-generated method stub
 		rpcService.addRPCListener(listener);
 		
 	}
-
+	/**
+	 * Remove the listener to RPC connections on cluster.
+	 * The listener is dispatched at connect or disconnect events. 
+	 * Can be used to monitor connections or disconnections on cluster configs.
+	 */
 	@Override
 	public void removeRPCListener(IRPCListener listener) {
 		// TODO Auto-generated method stub