Kryo related fixes

- KryoNamespace to allow control over registration id

Change-Id: Idc2a0e27a09916657c725ee97e4366109144cc66
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/ClusterCommunicationManager.java b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/ClusterCommunicationManager.java
index 70aeeed..8ff3392 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/ClusterCommunicationManager.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/cluster/messaging/impl/ClusterCommunicationManager.java
@@ -34,7 +34,6 @@
 import org.onlab.onos.cluster.ClusterService;
 import org.onlab.onos.cluster.ControllerNode;
 import org.onlab.onos.cluster.NodeId;
-import org.onlab.onos.store.cluster.impl.ClusterMembershipEvent;
 import org.onlab.onos.store.cluster.messaging.ClusterCommunicationService;
 import org.onlab.onos.store.cluster.messaging.ClusterMessage;
 import org.onlab.onos.store.cluster.messaging.ClusterMessageHandler;
@@ -67,12 +66,10 @@
         protected void setupKryoPool() {
             serializerPool = KryoNamespace.newBuilder()
                     .register(KryoNamespaces.API)
-                    .register(ClusterMessage.class, new ClusterMessageSerializer())
-                    .register(ClusterMembershipEvent.class)
-                    .register(byte[].class)
-                    .register(MessageSubject.class, new MessageSubjectSerializer())
-                    .build()
-                    .populate(1);
+                    .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID)
+                    .register(new ClusterMessageSerializer(), ClusterMessage.class)
+                    .register(new MessageSubjectSerializer(), MessageSubject.class)
+                    .build();
         }
 
     };
@@ -194,11 +191,17 @@
 
         @Override
         public void handle(Message message) {
+            final ClusterMessage clusterMessage;
             try {
-                ClusterMessage clusterMessage = SERIALIZER.decode(message.payload());
+                clusterMessage = SERIALIZER.decode(message.payload());
+            } catch (Exception e) {
+                log.error("Failed decoding ClusterMessage", e);
+                throw e;
+            }
+            try {
                 handler.handle(new InternalClusterMessage(clusterMessage, message));
             } catch (Exception e) {
-                log.error("Exception caught during ClusterMessageHandler", e);
+                log.error("Exception caught handling {}", clusterMessage, e);
                 throw e;
             }
         }
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/core/impl/DistributedApplicationIdStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/core/impl/DistributedApplicationIdStore.java
index 24f4f74..884bc12 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/core/impl/DistributedApplicationIdStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/core/impl/DistributedApplicationIdStore.java
@@ -65,8 +65,8 @@
             protected void setupKryoPool() {
                 serializerPool = KryoNamespace.newBuilder()
                         .register(KryoNamespaces.API)
-                        .build()
-                        .populate(1);
+                        .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID)
+                        .build();
             }
         };
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/GossipDeviceStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/GossipDeviceStore.java
index 8d32585..0de64ca 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/GossipDeviceStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/GossipDeviceStore.java
@@ -141,18 +141,17 @@
         @Override
         protected void setupKryoPool() {
             serializerPool = KryoNamespace.newBuilder()
-                    .register(DistributedStoreSerializers.COMMON)
-
-                    .register(InternalDeviceEvent.class, new InternalDeviceEventSerializer())
-                    .register(InternalDeviceOfflineEvent.class, new InternalDeviceOfflineEventSerializer())
+                    .register(DistributedStoreSerializers.STORE_COMMON)
+                    .nextId(DistributedStoreSerializers.STORE_CUSTOM_BEGIN)
+                    .register(new InternalDeviceEventSerializer(), InternalDeviceEvent.class)
+                    .register(new InternalDeviceOfflineEventSerializer(), InternalDeviceOfflineEvent.class)
                     .register(InternalDeviceRemovedEvent.class)
-                    .register(InternalPortEvent.class, new InternalPortEventSerializer())
-                    .register(InternalPortStatusEvent.class, new InternalPortStatusEventSerializer())
+                    .register(new InternalPortEventSerializer(), InternalPortEvent.class)
+                    .register(new InternalPortStatusEventSerializer(), InternalPortStatusEvent.class)
                     .register(DeviceAntiEntropyAdvertisement.class)
                     .register(DeviceFragmentId.class)
                     .register(PortFragmentId.class)
-                    .build()
-                    .populate(1);
+                    .build();
         }
     };
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/flow/impl/DistributedFlowRuleStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/flow/impl/DistributedFlowRuleStore.java
index f7718c1..d6d06d0 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/flow/impl/DistributedFlowRuleStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/flow/impl/DistributedFlowRuleStore.java
@@ -156,9 +156,9 @@
         @Override
         protected void setupKryoPool() {
             serializerPool = KryoNamespace.newBuilder()
-                    .register(DistributedStoreSerializers.COMMON)
-                    .build()
-                    .populate(1);
+                    .register(DistributedStoreSerializers.STORE_COMMON)
+                    .nextId(DistributedStoreSerializers.STORE_CUSTOM_BEGIN)
+                    .build();
         }
     };
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/host/impl/GossipHostStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/host/impl/GossipHostStore.java
index e1be932..6620477 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/host/impl/GossipHostStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/host/impl/GossipHostStore.java
@@ -123,13 +123,13 @@
         @Override
         protected void setupKryoPool() {
             serializerPool = KryoNamespace.newBuilder()
-                    .register(DistributedStoreSerializers.COMMON)
+                    .register(DistributedStoreSerializers.STORE_COMMON)
+                    .nextId(DistributedStoreSerializers.STORE_CUSTOM_BEGIN)
                     .register(InternalHostEvent.class)
                     .register(InternalHostRemovedEvent.class)
                     .register(HostFragmentId.class)
                     .register(HostAntiEntropyAdvertisement.class)
-                    .build()
-                    .populate(1);
+                    .build();
         }
     };
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/DistributedIntentStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/DistributedIntentStore.java
index 27c1284..3ad4036 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/DistributedIntentStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/DistributedIntentStore.java
@@ -93,8 +93,8 @@
                 serializerPool = KryoNamespace.newBuilder()
                         .setRegistrationRequired(false)
                         .register(KryoNamespaces.API)
-                        .build()
-                        .populate(1);
+                        .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID)
+                        .build();
             }
         };
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/HazelcastIntentStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/HazelcastIntentStore.java
index fecaf6a..80c27d1 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/HazelcastIntentStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/intent/impl/HazelcastIntentStore.java
@@ -86,8 +86,8 @@
                 serializerPool = KryoNamespace.newBuilder()
                         .setRegistrationRequired(false)
                         .register(KryoNamespaces.API)
-                        .build()
-                        .populate(1);
+                        .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID)
+                        .build();
             }
 
         };
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/link/impl/GossipLinkStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/link/impl/GossipLinkStore.java
index 97d1ce7..3ec7524 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/link/impl/GossipLinkStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/link/impl/GossipLinkStore.java
@@ -129,13 +129,13 @@
         @Override
         protected void setupKryoPool() {
             serializerPool = KryoNamespace.newBuilder()
-                    .register(DistributedStoreSerializers.COMMON)
+                    .register(DistributedStoreSerializers.STORE_COMMON)
+                    .nextId(DistributedStoreSerializers.STORE_CUSTOM_BEGIN)
                     .register(InternalLinkEvent.class)
                     .register(InternalLinkRemovedEvent.class)
                     .register(LinkAntiEntropyAdvertisement.class)
                     .register(LinkFragmentId.class)
-                    .build()
-                    .populate(1);
+                    .build();
         }
     };
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStore.java
index dd5041a..78a92a8 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/mastership/impl/DistributedMastershipStore.java
@@ -84,10 +84,9 @@
             protected void setupKryoPool() {
                 serializerPool = KryoNamespace.newBuilder()
                         .register(KryoNamespaces.API)
-
-                        .register(RoleValue.class, new RoleValueSerializer())
-                        .build()
-                        .populate(1);
+                        .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID)
+                        .register(new RoleValueSerializer(), RoleValue.class)
+                        .build();
             }
         };
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/packet/impl/DistributedPacketStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/packet/impl/DistributedPacketStore.java
index be38785..793e759 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/packet/impl/DistributedPacketStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/packet/impl/DistributedPacketStore.java
@@ -72,8 +72,8 @@
         protected void setupKryoPool() {
             serializerPool = KryoNamespace.newBuilder()
                     .register(KryoNamespaces.API)
-                    .build()
-                    .populate(1);
+                    .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID)
+                    .build();
         }
     };
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/serializers/impl/DistributedStoreSerializers.java b/core/store/dist/src/main/java/org/onlab/onos/store/serializers/impl/DistributedStoreSerializers.java
index 2de47bd..5ef8aaf 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/serializers/impl/DistributedStoreSerializers.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/serializers/impl/DistributedStoreSerializers.java
@@ -23,13 +23,17 @@
 
 public final class DistributedStoreSerializers {
 
+
+    public static final int STORE_CUSTOM_BEGIN = KryoNamespaces.BEGIN_USER_CUSTOM_ID + 10;
+
     /**
      * KryoNamespace which can serialize ON.lab misc classes.
      */
-    public static final KryoNamespace COMMON = KryoNamespace.newBuilder()
+    public static final KryoNamespace STORE_COMMON = KryoNamespace.newBuilder()
             .register(KryoNamespaces.API)
+            .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID)
             .register(Timestamped.class)
-            .register(MastershipBasedTimestamp.class, new MastershipBasedTimestampSerializer())
+            .register(new MastershipBasedTimestampSerializer(), MastershipBasedTimestamp.class)
             .register(WallClockTimestamp.class)
             .build();
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/CMap.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/CMap.java
index b771b80..2c390c5 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/CMap.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/CMap.java
@@ -55,8 +55,8 @@
      * Creates a CMap instance.
      * It will create the table if necessary.
      *
-     * @param dbAdminService
-     * @param dbService
+     * @param dbAdminService DatabaseAdminService to use for this instance
+     * @param dbService DatabaseService to use for this instance
      * @param tableName table which this Map corresponds to
      * @param serializer Value serializer
      */
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/ClusterMessagingProtocol.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/ClusterMessagingProtocol.java
index b2f5c2b..5a6a82a 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/ClusterMessagingProtocol.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/ClusterMessagingProtocol.java
@@ -2,13 +2,6 @@
 
 import static org.slf4j.LoggerFactory.getLogger;
 
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.LinkedList;
 import java.util.Vector;
 
 import net.kuujo.copycat.cluster.TcpClusterConfig;
@@ -40,29 +33,14 @@
 import org.onlab.onos.cluster.ClusterService;
 import org.onlab.onos.store.cluster.messaging.ClusterCommunicationService;
 import org.onlab.onos.store.cluster.messaging.MessageSubject;
-import org.onlab.onos.store.serializers.ImmutableListSerializer;
-import org.onlab.onos.store.serializers.ImmutableMapSerializer;
-import org.onlab.onos.store.serializers.ImmutableSetSerializer;
+import org.onlab.onos.store.serializers.KryoNamespaces;
 import org.onlab.onos.store.serializers.KryoSerializer;
-import org.onlab.onos.store.service.BatchReadRequest;
-import org.onlab.onos.store.service.BatchWriteRequest;
-import org.onlab.onos.store.service.ReadRequest;
-import org.onlab.onos.store.service.ReadResult;
-import org.onlab.onos.store.service.ReadStatus;
-import org.onlab.onos.store.service.VersionedValue;
-import org.onlab.onos.store.service.WriteRequest;
-import org.onlab.onos.store.service.WriteResult;
-import org.onlab.onos.store.service.WriteStatus;
+import org.onlab.onos.store.serializers.StoreSerializer;
+import org.onlab.onos.store.service.impl.DatabaseStateMachine.State;
+import org.onlab.onos.store.service.impl.DatabaseStateMachine.TableMetadata;
 import org.onlab.util.KryoNamespace;
 import org.slf4j.Logger;
 
-import com.esotericsoftware.kryo.Kryo;
-import com.esotericsoftware.kryo.io.Input;
-import com.esotericsoftware.kryo.serializers.CollectionSerializer;
-import com.google.common.collect.ImmutableList;
-import com.google.common.collect.ImmutableMap;
-import com.google.common.collect.ImmutableSet;
-
 /**
  * ONOS Cluster messaging based Copycat protocol.
  */
@@ -88,7 +66,11 @@
     public static final MessageSubject COPYCAT_SUBMIT =
             new MessageSubject("copycat-raft-consensus-submit");
 
-    private static final KryoNamespace COPYCAT = KryoNamespace.newBuilder()
+    static final int AFTER_COPYCAT = KryoNamespaces.BEGIN_USER_CUSTOM_ID + 50;
+
+    static final KryoNamespace COPYCAT = KryoNamespace.newBuilder()
+            .register(KryoNamespaces.API)
+            .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID)
             .register(PingRequest.class)
             .register(PingResponse.class)
             .register(PollRequest.class)
@@ -105,53 +87,23 @@
             .register(TcpClusterConfig.class)
             .register(TcpMember.class)
             .register(LeaderElectEvent.class)
-            .build();
-
-    private static final KryoNamespace DATABASE = KryoNamespace.newBuilder()
-            .register(ReadRequest.class)
-            .register(WriteRequest.class)
-            .register(WriteRequest.Type.class)
-            .register(WriteResult.class)
-            .register(ReadResult.class)
-            .register(BatchReadRequest.class)
-            .register(BatchWriteRequest.class)
-            .register(ReadStatus.class)
-            .register(WriteStatus.class)
-            .register(VersionedValue.class)
-            .build();
-
-    public static final KryoNamespace COMMON = KryoNamespace.newBuilder()
-            .register(Arrays.asList().getClass(), new CollectionSerializer() {
-                @Override
-                @SuppressWarnings("rawtypes")
-                protected Collection<?> create(Kryo kryo, Input input, Class<Collection> type) {
-                    return new ArrayList();
-                }
-            })
-            .register(ImmutableMap.class, new ImmutableMapSerializer())
-            .register(ImmutableList.class, new ImmutableListSerializer())
-            .register(ImmutableSet.class, new ImmutableSetSerializer())
-            .register(
-                    Vector.class,
-                    ArrayList.class,
-                    Arrays.asList().getClass(),
-                    HashMap.class,
-                    HashSet.class,
-                    LinkedList.class,
-                    Collections.singletonList("").getClass(),
-                    byte[].class)
+            .register(Vector.class)
             .build();
 
     // serializer used for CopyCat Protocol
-    public static final KryoSerializer SERIALIZER = new KryoSerializer() {
+    public static final StoreSerializer DB_SERIALIZER = new KryoSerializer() {
         @Override
         protected void setupKryoPool() {
             serializerPool = KryoNamespace.newBuilder()
                     .register(COPYCAT)
-                    .register(COMMON)
-                    .register(DATABASE)
-                    .build()
-                    .populate(1);
+                    .nextId(AFTER_COPYCAT)
+                     // for snapshot
+                    .register(State.class)
+                    .register(TableMetadata.class)
+                    // TODO: Move this out ?
+                    .register(TableModificationEvent.class)
+                    .register(TableModificationEvent.Type.class)
+                    .build();
         }
     };
 
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/ClusterMessagingProtocolClient.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/ClusterMessagingProtocolClient.java
index 9bba4b5..475db82 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/ClusterMessagingProtocolClient.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/ClusterMessagingProtocolClient.java
@@ -1,7 +1,7 @@
 package org.onlab.onos.store.service.impl;
 
 import static com.google.common.base.Verify.verifyNotNull;
-import static org.onlab.onos.store.service.impl.ClusterMessagingProtocol.SERIALIZER;
+import static org.onlab.onos.store.service.impl.ClusterMessagingProtocol.DB_SERIALIZER;
 import static org.onlab.util.Tools.namedThreads;
 import static org.slf4j.LoggerFactory.getLogger;
 
@@ -139,7 +139,7 @@
                     new ClusterMessage(
                             localNode.id(),
                             messageType(request),
-                            verifyNotNull(SERIALIZER.encode(request)));
+                            verifyNotNull(DB_SERIALIZER.encode(request)));
             this.future = future;
         }
 
@@ -158,7 +158,8 @@
                 if (!connectionOK.getAndSet(true)) {
                     log.info("Connectivity to {} restored", remoteNode);
                 }
-                future.complete(verifyNotNull(SERIALIZER.decode(response)));
+                future.complete(verifyNotNull(DB_SERIALIZER.decode(response)));
+
             } catch (IOException | TimeoutException e) {
                 if (connectionOK.getAndSet(false)) {
                     log.warn("Detected connectivity issues with {}. Reason: {}", remoteNode, e.getMessage());
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/ClusterMessagingProtocolServer.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/ClusterMessagingProtocolServer.java
index 0ecc0a5..373bc97 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/ClusterMessagingProtocolServer.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/ClusterMessagingProtocolServer.java
@@ -66,7 +66,7 @@
 
         @Override
         public void handle(ClusterMessage message) {
-            T request = ClusterMessagingProtocol.SERIALIZER.decode(message.payload());
+            T request = ClusterMessagingProtocol.DB_SERIALIZER.decode(message.payload());
             if (handler == null) {
                 // there is a slight window of time during state transition,
                 // where handler becomes null
@@ -117,7 +117,7 @@
                 } else {
                     try {
                         log.trace("responding to {}", message.subject());
-                        message.respond(ClusterMessagingProtocol.SERIALIZER.encode(response));
+                        message.respond(ClusterMessagingProtocol.DB_SERIALIZER.encode(response));
                     } catch (Exception e) {
                         log.error("Failed to respond to " + response.getClass().getName(), e);
                     }
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseClient.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseClient.java
index c3f9118..17f356b 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseClient.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseClient.java
@@ -54,7 +54,7 @@
     @Override
     public void handle(ClusterMessage message) {
         LeaderElectEvent event =
-                ClusterMessagingProtocol.SERIALIZER.decode(message.payload());
+                ClusterMessagingProtocol.DB_SERIALIZER.decode(message.payload());
         TcpMember newLeader = event.leader();
         long newLeaderTerm = event.term();
         if (newLeader != null && !newLeader.equals(currentLeader) && newLeaderTerm > currentLeaderTerm) {
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseEntryExpirationTracker.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseEntryExpirationTracker.java
index 2fba52e..df9c73f 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseEntryExpirationTracker.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseEntryExpirationTracker.java
@@ -101,7 +101,7 @@
                     log.debug("Broadcasting {} to the entire cluster", event);
                     clusterCommunicator.broadcastIncludeSelf(new ClusterMessage(
                             localNode.id(), DatabaseStateMachine.DATABASE_UPDATE_EVENTS,
-                            DatabaseStateMachine.SERIALIZER.encode(event)));
+                            ClusterMessagingProtocol.DB_SERIALIZER.encode(event)));
                 } catch (IOException e) {
                     log.error("Failed to broadcast a database row deleted event.", e);
                 }
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseManager.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseManager.java
index 2c0ff14..c3494d9 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseManager.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseManager.java
@@ -173,7 +173,7 @@
             DatabaseStateMachine stateMachine = new DatabaseStateMachine();
             stateMachine.addEventListener(expirationTracker);
             Log consensusLog = new MapDBLog(LOG_FILE_PREFIX + localNode.id(),
-                    ClusterMessagingProtocol.SERIALIZER);
+                    ClusterMessagingProtocol.DB_SERIALIZER);
 
             copycat = new Copycat(stateMachine, consensusLog, cluster, copycatMessagingProtocol);
             copycat.event(LeaderElectEvent.class).registerHandler(new RaftLeaderElectionMonitor());
@@ -432,7 +432,7 @@
                             new ClusterMessage(
                                     clusterService.getLocalNode().id(),
                                     RAFT_LEADER_ELECTION_EVENT,
-                                    ClusterMessagingProtocol.SERIALIZER.encode(event)));
+                                    ClusterMessagingProtocol.DB_SERIALIZER.encode(event)));
                 }
             } catch (Exception e) {
                 log.debug("LeaderAdvertiser failed with exception", e);
@@ -454,7 +454,7 @@
                             new ClusterMessage(
                                     clusterService.getLocalNode().id(),
                                     RAFT_LEADER_ELECTION_EVENT,
-                                    ClusterMessagingProtocol.SERIALIZER.encode(event)));
+                                    ClusterMessagingProtocol.DB_SERIALIZER.encode(event)));
                 } else {
                     if (myLeaderEvent != null) {
                         log.debug("This node is no longer the Leader");
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseStateMachine.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseStateMachine.java
index 2fbef0b..cfb8512b 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseStateMachine.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DatabaseStateMachine.java
@@ -2,6 +2,7 @@
 
 import static org.onlab.util.Tools.namedThreads;
 import static org.slf4j.LoggerFactory.getLogger;
+import static org.onlab.onos.store.service.impl.ClusterMessagingProtocol.DB_SERIALIZER;
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
@@ -20,7 +21,6 @@
 import net.kuujo.copycat.StateMachine;
 
 import org.onlab.onos.store.cluster.messaging.MessageSubject;
-import org.onlab.onos.store.serializers.KryoSerializer;
 import org.onlab.onos.store.service.BatchReadRequest;
 import org.onlab.onos.store.service.BatchWriteRequest;
 import org.onlab.onos.store.service.ReadRequest;
@@ -30,7 +30,6 @@
 import org.onlab.onos.store.service.WriteRequest;
 import org.onlab.onos.store.service.WriteResult;
 import org.onlab.onos.store.service.WriteStatus;
-import org.onlab.util.KryoNamespace;
 import org.slf4j.Logger;
 
 import com.google.common.base.MoreObjects;
@@ -39,7 +38,6 @@
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
-import com.google.common.io.ByteStreams;
 
 /**
  * StateMachine whose transitions are coordinated/replicated
@@ -59,33 +57,13 @@
     public static final MessageSubject DATABASE_UPDATE_EVENTS =
             new MessageSubject("database-update-events");
 
-    // serializer used for snapshot
-    public static final KryoSerializer SERIALIZER = new KryoSerializer() {
-        @Override
-        protected void setupKryoPool() {
-            serializerPool = KryoNamespace.newBuilder()
-                    .register(VersionedValue.class)
-                    .register(State.class)
-                    .register(TableMetadata.class)
-                    .register(BatchReadRequest.class)
-                    .register(BatchWriteRequest.class)
-                    .register(ReadStatus.class)
-                    .register(WriteStatus.class)
-                    // TODO: Move this out ?
-                    .register(TableModificationEvent.class)
-                    .register(TableModificationEvent.Type.class)
-                    .register(ClusterMessagingProtocol.COMMON)
-                    .build()
-                    .populate(1);
-        }
-    };
-
     private final Set<DatabaseUpdateEventListener> listeners = Sets.newIdentityHashSet();
 
     // durable internal state of the database.
     private State state = new State();
 
-    private boolean compressSnapshot = false;
+    // TODO make this configurable
+    private boolean compressSnapshot = true;
 
     @Command
     public boolean createTable(String tableName) {
@@ -402,14 +380,14 @@
     public byte[] takeSnapshot() {
         try {
             if (compressSnapshot) {
-                byte[] input = SERIALIZER.encode(state);
+                byte[] input = DB_SERIALIZER.encode(state);
                 ByteArrayOutputStream comp = new ByteArrayOutputStream(input.length);
                 DeflaterOutputStream compressor = new DeflaterOutputStream(comp);
                 compressor.write(input, 0, input.length);
                 compressor.close();
                 return comp.toByteArray();
             } else {
-                return SERIALIZER.encode(state);
+                return DB_SERIALIZER.encode(state);
             }
         } catch (Exception e) {
             log.error("Failed to take snapshot", e);
@@ -423,10 +401,9 @@
             if (compressSnapshot) {
                 ByteArrayInputStream in = new ByteArrayInputStream(data);
                 InflaterInputStream decompressor = new InflaterInputStream(in);
-                ByteStreams.toByteArray(decompressor);
-                this.state = SERIALIZER.decode(ByteStreams.toByteArray(decompressor));
+                this.state = DB_SERIALIZER.decode(decompressor);
             } else {
-                this.state = SERIALIZER.decode(data);
+                this.state = DB_SERIALIZER.decode(data);
             }
 
             updatesExecutor.submit(new Runnable() {
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DistributedLockManager.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DistributedLockManager.java
index 74f8373..45cc7ed 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DistributedLockManager.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/DistributedLockManager.java
@@ -149,7 +149,7 @@
     private class LockEventMessageListener implements ClusterMessageHandler {
         @Override
         public void handle(ClusterMessage message) {
-            TableModificationEvent event = DatabaseStateMachine.SERIALIZER
+            TableModificationEvent event = ClusterMessagingProtocol.DB_SERIALIZER
                     .decode(message.payload());
             if (event.tableName().equals(ONOS_LOCK_TABLE_NAME) &&
                     event.type().equals(TableModificationEvent.Type.ROW_DELETED)) {
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/statistic/impl/DistributedStatisticStore.java b/core/store/dist/src/main/java/org/onlab/onos/store/statistic/impl/DistributedStatisticStore.java
index cc432a0..42fcf98 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/statistic/impl/DistributedStatisticStore.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/statistic/impl/DistributedStatisticStore.java
@@ -90,9 +90,9 @@
         protected void setupKryoPool() {
             serializerPool = KryoNamespace.newBuilder()
                     .register(KryoNamespaces.API)
+                    .nextId(KryoNamespaces.BEGIN_USER_CUSTOM_ID)
                     // register this store specific classes here
-                    .build()
-                    .populate(1);
+                    .build();
         }
     };;
 
diff --git a/core/store/dist/src/test/java/org/onlab/onos/store/impl/MastershipBasedTimestampTest.java b/core/store/dist/src/test/java/org/onlab/onos/store/impl/MastershipBasedTimestampTest.java
index e1da794..9832483 100644
--- a/core/store/dist/src/test/java/org/onlab/onos/store/impl/MastershipBasedTimestampTest.java
+++ b/core/store/dist/src/test/java/org/onlab/onos/store/impl/MastershipBasedTimestampTest.java
@@ -95,7 +95,7 @@
     public final void testKryoSerializableWithHandcraftedSerializer() {
         final ByteBuffer buffer = ByteBuffer.allocate(1 * 1024 * 1024);
         final KryoNamespace kryos = KryoNamespace.newBuilder()
-                .register(MastershipBasedTimestamp.class, new MastershipBasedTimestampSerializer())
+                .register(new MastershipBasedTimestampSerializer(), MastershipBasedTimestamp.class)
                 .build();
 
         kryos.serialize(TS_1_2, buffer);
diff --git a/core/store/dist/src/test/java/org/onlab/onos/store/service/impl/MapDBLogTest.java b/core/store/dist/src/test/java/org/onlab/onos/store/service/impl/MapDBLogTest.java
index f14ef92..5aae159 100644
--- a/core/store/dist/src/test/java/org/onlab/onos/store/service/impl/MapDBLogTest.java
+++ b/core/store/dist/src/test/java/org/onlab/onos/store/service/impl/MapDBLogTest.java
@@ -22,7 +22,7 @@
  */
 public class MapDBLogTest {
 
-    private static final StoreSerializer SERIALIZER = ClusterMessagingProtocol.SERIALIZER;
+    private static final StoreSerializer SERIALIZER = ClusterMessagingProtocol.DB_SERIALIZER;
     private static final Entry TEST_ENTRY1 = new OperationEntry(1, "test1");
     private static final Entry TEST_ENTRY2 = new OperationEntry(2, "test12");
     private static final Entry TEST_ENTRY3 = new OperationEntry(3, "test123");