diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/InternalWriteResult.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/InternalWriteResult.java
index ba714af..e936f48 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/InternalWriteResult.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/InternalWriteResult.java
@@ -2,6 +2,8 @@
 
 import org.onlab.onos.store.service.WriteResult;
 
+import com.google.common.base.MoreObjects;
+
 /**
  * Result of a write operation executed on the DatabaseStateMachine.
  */
@@ -34,4 +36,12 @@
     public WriteResult result() {
         return result;
     }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("status", status)
+                .add("result", result)
+                .toString();
+    }
 }
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/MapDBLog.java b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/MapDBLog.java
index 933e0ee..663e0f0 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/MapDBLog.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/service/impl/MapDBLog.java
@@ -2,6 +2,7 @@
 
 import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Preconditions.checkState;
+import static org.slf4j.LoggerFactory.getLogger;
 
 import java.io.File;
 import java.io.IOException;
@@ -22,6 +23,7 @@
 import org.mapdb.TxBlock;
 import org.mapdb.TxMaker;
 import org.onlab.onos.store.serializers.StoreSerializer;
+import org.slf4j.Logger;
 
 import com.google.common.collect.Lists;
 
@@ -30,6 +32,8 @@
  */
 public class MapDBLog implements Log {
 
+    private final Logger log = getLogger(getClass());
+
     private final File dbFile;
     private TxMaker txMaker;
     private final StoreSerializer serializer;
@@ -273,7 +277,11 @@
                 size.addAndGet(-1 * deletedBytes);
                 byte[] entryBytes = serializer.encode(entry);
                 byte[] existingEntry = log.put(index, entryBytes);
-                size.addAndGet(entryBytes.length - existingEntry.length);
+                if (existingEntry != null) {
+                    size.addAndGet(entryBytes.length - existingEntry.length);
+                } else {
+                    size.addAndGet(entryBytes.length);
+                }
                 db.compact();
             }
         });
diff --git a/utils/netty/src/main/java/org/onlab/netty/NettyMessagingService.java b/utils/netty/src/main/java/org/onlab/netty/NettyMessagingService.java
index 5b7266e..771300f 100644
--- a/utils/netty/src/main/java/org/onlab/netty/NettyMessagingService.java
+++ b/utils/netty/src/main/java/org/onlab/netty/NettyMessagingService.java
@@ -15,14 +15,6 @@
  */
 package org.onlab.netty;
 
-import java.io.IOException;
-import java.net.UnknownHostException;
-import java.util.concurrent.ConcurrentHashMap;
-import java.util.concurrent.ConcurrentMap;
-import java.util.concurrent.TimeUnit;
-import java.util.concurrent.TimeoutException;
-import java.util.concurrent.atomic.AtomicLong;
-
 import io.netty.bootstrap.Bootstrap;
 import io.netty.bootstrap.ServerBootstrap;
 import io.netty.buffer.PooledByteBufAllocator;
@@ -44,6 +36,14 @@
 import io.netty.channel.socket.nio.NioServerSocketChannel;
 import io.netty.channel.socket.nio.NioSocketChannel;
 
+import java.io.IOException;
+import java.net.UnknownHostException;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.atomic.AtomicLong;
+
 import org.apache.commons.pool.KeyedPoolableObjectFactory;
 import org.apache.commons.pool.impl.GenericKeyedObjectPool;
 import org.slf4j.Logger;
@@ -307,7 +307,8 @@
                         futureResponse.set(message.payload());
                     } else {
                         log.warn("Received a reply for message id:[{}]. "
-                                + "But was unable to locate the request handle", message.id());
+                                + " from {}. But was unable to locate the"
+                                + " request handle", message.id(), message.sender());
                     }
                 } finally {
                     NettyMessagingService.this.responseFutures.invalidate(message.id());