https://issues.apache.org/jira/browse/AMQ-6375

Adding non-blocking metrics to KahaDB to track message counts and sizes
for subscriptions.  Turned off by default but can be enabled on the
KahaDBPersistenceAdapter

activemq-broker/src/main/java/org/apache/activemq/broker/region/cursors/TopicStorePrefetch.java

@@ -70,7 +70,6 @@ class TopicStorePrefetch extends AbstractStoreCursor {
         batchList.addMessageFirst(node);
         size++;
         node.incrementReferenceCount();
-        //this.messageSize.addSize(node.getMessage().getSize());
     }
 
     @Override

activemq-broker/src/main/java/org/apache/activemq/store/AbstractMessageStoreStatistics.java

@@ -0,0 +1,81 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.activemq.store;
+
+import org.apache.activemq.management.CountStatisticImpl;
+import org.apache.activemq.management.SizeStatisticImpl;
+import org.apache.activemq.management.StatsImpl;
+
+
+public abstract class AbstractMessageStoreStatistics extends StatsImpl {
+
+    protected final CountStatisticImpl messageCount;
+    protected final SizeStatisticImpl messageSize;
+
+
+    protected AbstractMessageStoreStatistics(String countDescription, String sizeDescription) {
+        this(true, countDescription, sizeDescription);
+    }
+
+    protected AbstractMessageStoreStatistics(boolean enabled, String countDescription, String sizeDescription) {
+
+        messageCount = new CountStatisticImpl("messageCount", countDescription);
+        messageSize = new SizeStatisticImpl("messageSize", sizeDescription);
+
+        addStatistic("messageCount", messageCount);
+        addStatistic("messageSize", messageSize);
+
+        this.setEnabled(enabled);
+    }
+
+
+    public CountStatisticImpl getMessageCount() {
+        return messageCount;
+    }
+
+    public SizeStatisticImpl getMessageSize() {
+        return messageSize;
+    }
+
+    @Override
+    public void reset() {
+        if (this.isDoReset()) {
+            super.reset();
+            messageCount.reset();
+            messageSize.reset();
+        }
+    }
+
+    @Override
+    public void setEnabled(boolean enabled) {
+        super.setEnabled(enabled);
+        messageCount.setEnabled(enabled);
+        messageSize.setEnabled(enabled);
+    }
+
+    public void setParent(AbstractMessageStoreStatistics parent) {
+        if (parent != null) {
+            messageCount.setParent(parent.messageCount);
+            messageSize.setParent(parent.messageSize);
+        } else {
+            messageCount.setParent(null);
+            messageSize.setParent(null);
+        }
+    }
+
+}

activemq-broker/src/main/java/org/apache/activemq/store/MessageStoreSubscriptionStatistics.java

@@ -0,0 +1,112 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.activemq.store;
+
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+import org.apache.activemq.management.CountStatisticImpl;
+import org.apache.activemq.management.SizeStatisticImpl;
+
+public class MessageStoreSubscriptionStatistics extends AbstractMessageStoreStatistics {
+
+    private final ConcurrentMap<String, SubscriptionStatistics> subStatistics
+        = new ConcurrentHashMap<>();
+
+    /**
+     * @param enabled
+     * @param countDescription
+     * @param sizeDescription
+     */
+    public MessageStoreSubscriptionStatistics(boolean enabled) {
+        super(enabled, "The number of messages or this subscription in the message store",
+                "Size of messages contained by this subscription in the message store");
+    }
+
+    /**
+     * Total count for all subscriptions
+     */
+    @Override
+    public CountStatisticImpl getMessageCount() {
+        return this.messageCount;
+    }
+
+    /**
+     * Total size for all subscriptions
+     */
+    @Override
+    public SizeStatisticImpl getMessageSize() {
+        return this.messageSize;
+    }
+
+    public CountStatisticImpl getMessageCount(String subKey) {
+        return getOrInitStatistics(subKey).getMessageCount();
+    }
+
+    public SizeStatisticImpl getMessageSize(String subKey) {
+        return getOrInitStatistics(subKey).getMessageSize();
+    }
+
+    public void removeSubscription(String subKey) {
+        SubscriptionStatistics subStats = subStatistics.remove(subKey);
+        //Subtract from the parent
+        if (subStats != null) {
+           getMessageCount().subtract(subStats.getMessageCount().getCount());
+           getMessageSize().addSize(-subStats.getMessageSize().getTotalSize());
+        }
+    }
+
+    @Override
+    public void reset() {
+        super.reset();
+        subStatistics.clear();
+    }
+
+    private SubscriptionStatistics getOrInitStatistics(String subKey) {
+        SubscriptionStatistics subStats = subStatistics.get(subKey);
+
+        if (subStats == null) {
+            final SubscriptionStatistics stats = new SubscriptionStatistics();
+            subStats = subStatistics.putIfAbsent(subKey, stats);
+            if (subStats == null) {
+                subStats = stats;
+            }
+        }
+
+        return subStats;
+    }
+
+    private class SubscriptionStatistics extends AbstractMessageStoreStatistics {
+
+        public SubscriptionStatistics() {
+            this(MessageStoreSubscriptionStatistics.this.enabled);
+        }
+
+        /**
+         * @param enabled
+         * @param countDescription
+         * @param sizeDescription
+         */
+        public SubscriptionStatistics(boolean enabled) {
+            super(enabled, "The number of messages or this subscription in the message store",
+                    "Size of messages contained by this subscription in the message store");
+            this.setParent(MessageStoreSubscriptionStatistics.this);
+        }
+    }
+
+}

activemq-broker/src/main/java/org/apache/activemq/store/ProxyTopicMessageStore.java

@@ -233,4 +233,8 @@ public class ProxyTopicMessageStore implements TopicMessageStore {
         return delegate.getMessageSize(clientId, subscriberName);
     }
 
+    @Override
+    public MessageStoreSubscriptionStatistics getMessageStoreSubStatistics() {
+        return delegate.getMessageStoreSubStatistics();
+    }
 }

activemq-broker/src/main/java/org/apache/activemq/store/TopicMessageStore.java

@@ -102,8 +102,25 @@ public interface TopicMessageStore extends MessageStore {
      */
     int getMessageCount(String clientId, String subscriberName) throws IOException;
 
+    /**
+     * Get the total size of the messages ready to deliver from the store to the
+     * durable subscriber
+     *
+     * @param clientId
+     * @param subscriberName
+     * @return
+     * @throws IOException
+     */
     long getMessageSize(String clientId, String subscriberName) throws IOException;
 
+    /**
+     * The subscription metrics contained in this store
+     *
+     * @param subscriptionKey
+     * @return
+     */
+    MessageStoreSubscriptionStatistics getMessageStoreSubStatistics();
+
     /**
      * Finds the subscriber entry for the given consumer info
      *

activemq-broker/src/main/java/org/apache/activemq/store/memory/MemoryTopicMessageStore.java

@@ -31,6 +31,7 @@ import org.apache.activemq.command.MessageId;
 import org.apache.activemq.command.SubscriptionInfo;
 import org.apache.activemq.store.MessageRecoveryListener;
 import org.apache.activemq.store.MessageStoreStatistics;
+import org.apache.activemq.store.MessageStoreSubscriptionStatistics;
 import org.apache.activemq.store.TopicMessageStore;
 import org.apache.activemq.util.LRUCache;
 import org.apache.activemq.util.SubscriptionKey;
@@ -171,6 +172,14 @@ public class MemoryTopicMessageStore extends MemoryMessageStore implements Topic
         }
     }
 
+    //Disabled for the memory store, can be enabled later if necessary
+    private final MessageStoreSubscriptionStatistics stats = new MessageStoreSubscriptionStatistics(false);
+
+    @Override
+    public MessageStoreSubscriptionStatistics getMessageStoreSubStatistics() {
+        return stats;
+    }
+
     /**
      * Since we initialize the store with a LRUCache in some cases, we need to account for cache evictions
      * when computing the message store statistics.

activemq-jdbc-store/src/main/java/org/apache/activemq/store/jdbc/JDBCTopicMessageStore.java

@@ -36,6 +36,7 @@ import org.apache.activemq.command.MessageAck;
 import org.apache.activemq.command.MessageId;
 import org.apache.activemq.command.SubscriptionInfo;
 import org.apache.activemq.store.MessageRecoveryListener;
+import org.apache.activemq.store.MessageStoreSubscriptionStatistics;
 import org.apache.activemq.store.TopicMessageStore;
 import org.apache.activemq.util.ByteSequence;
 import org.apache.activemq.util.IOExceptionSupport;
@@ -434,4 +435,11 @@ public class JDBCTopicMessageStore extends JDBCMessageStore implements TopicMess
         return result;
     }
 
+    private final MessageStoreSubscriptionStatistics stats = new MessageStoreSubscriptionStatistics(false);
+
+    @Override
+    public MessageStoreSubscriptionStatistics getMessageStoreSubStatistics() {
+        return stats;
+    }
+
 }

activemq-jdbc-store/src/main/java/org/apache/activemq/store/journal/JournalTopicMessageStore.java

@@ -29,6 +29,7 @@ import org.apache.activemq.command.MessageAck;
 import org.apache.activemq.command.MessageId;
 import org.apache.activemq.command.SubscriptionInfo;
 import org.apache.activemq.store.MessageRecoveryListener;
+import org.apache.activemq.store.MessageStoreSubscriptionStatistics;
 import org.apache.activemq.store.TopicMessageStore;
 import org.apache.activemq.transaction.Synchronization;
 import org.apache.activemq.util.Callback;
@@ -230,4 +231,10 @@ public class JournalTopicMessageStore extends JournalMessageStore implements Top
         longTermStore.resetBatching(clientId, subscriptionName);
     }
 
+    private final MessageStoreSubscriptionStatistics stats = new MessageStoreSubscriptionStatistics(false);
+
+    @Override
+    public MessageStoreSubscriptionStatistics getMessageStoreSubStatistics() {
+        return stats;
+    }
 }

activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/KahaDBPersistenceAdapter.java

@@ -687,6 +687,26 @@ public class KahaDBPersistenceAdapter extends LockableServiceSupport implements
         letter.setEnableAckCompaction(enableAckCompaction);
     }
 
+    /**
+     * Whether non-blocking subscription statistics have been enabled
+     *
+     * @return
+     */
+    public boolean isEnableSubscriptionStatistics() {
+        return letter.isEnableSubscriptionStatistics();
+    }
+
+    /**
+     * Enable caching statistics for each subscription to allow non-blocking
+     * retrieval of metrics.  This could incur some overhead to compute if there are a lot
+     * of subscriptions.
+     *
+     * @param enableSubscriptionStatistics
+     */
+    public void setEnableSubscriptionStatistics(boolean enableSubscriptionStatistics) {
+        letter.setEnableSubscriptionStatistics(enableSubscriptionStatistics);
+    }
+
     public KahaDBStore getStore() {
         return letter;
     }

activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/KahaDBStore.java

@@ -62,6 +62,7 @@ import org.apache.activemq.store.ListenableFuture;
 import org.apache.activemq.store.MessageRecoveryListener;
 import org.apache.activemq.store.MessageStore;
 import org.apache.activemq.store.MessageStoreStatistics;
+import org.apache.activemq.store.MessageStoreSubscriptionStatistics;
 import org.apache.activemq.store.PersistenceAdapter;
 import org.apache.activemq.store.TopicMessageStore;
 import org.apache.activemq.store.TransactionIdTransformer;
@@ -742,6 +743,9 @@ public class KahaDBStore extends MessageDatabase implements PersistenceAdapter {
 
     class KahaDBTopicMessageStore extends KahaDBMessageStore implements TopicMessageStore {
         private final AtomicInteger subscriptionCount = new AtomicInteger();
+        protected final MessageStoreSubscriptionStatistics messageStoreSubStats =
+                new MessageStoreSubscriptionStatistics(isEnableSubscriptionStatistics());
+
         public KahaDBTopicMessageStore(ActiveMQTopic destination) throws IOException {
             super(destination);
             this.subscriptionCount.set(getAllSubscriptions().length);
@@ -750,6 +754,12 @@ public class KahaDBStore extends MessageDatabase implements PersistenceAdapter {
             }
         }
 
+        @Override
+        protected void recoverMessageStoreStatistics() throws IOException {
+            super.recoverMessageStoreStatistics();
+            this.recoverMessageStoreSubMetrics();
+        }
+
         @Override
         public ListenableFuture<Object> asyncAddTopicMessage(final ConnectionContext context, final Message message)
                 throws IOException {
@@ -884,6 +894,11 @@ public class KahaDBStore extends MessageDatabase implements PersistenceAdapter {
         @Override
         public int getMessageCount(String clientId, String subscriptionName) throws IOException {
             final String subscriptionKey = subscriptionKey(clientId, subscriptionName);
+
+            if (isEnableSubscriptionStatistics()) {
+                return (int)this.messageStoreSubStats.getMessageCount(subscriptionKey).getCount();
+            } else {
+
                 indexLock.writeLock().lock();
                 try {
                     return pageFile.tx().execute(new Transaction.CallableClosure<Integer, IOException>() {
@@ -903,11 +918,15 @@ public class KahaDBStore extends MessageDatabase implements PersistenceAdapter {
                     indexLock.writeLock().unlock();
                 }
             }
+        }
 
 
         @Override
         public long getMessageSize(String clientId, String subscriptionName) throws IOException {
             final String subscriptionKey = subscriptionKey(clientId, subscriptionName);
+            if (isEnableSubscriptionStatistics()) {
+                return this.messageStoreSubStats.getMessageSize(subscriptionKey).getTotalSize();
+            } else {
                 indexLock.writeLock().lock();
                 try {
                     return pageFile.tx().execute(new Transaction.CallableClosure<Integer, IOException>() {
@@ -927,6 +946,39 @@ public class KahaDBStore extends MessageDatabase implements PersistenceAdapter {
                     indexLock.writeLock().unlock();
                 }
             }
+        }
+
+
+        protected void recoverMessageStoreSubMetrics() throws IOException {
+            if (isEnableSubscriptionStatistics()) {
+
+                final MessageStoreSubscriptionStatistics statistics = getMessageStoreSubStatistics();
+                indexLock.writeLock().lock();
+                try {
+                    pageFile.tx().execute(new Transaction.Closure<IOException>() {
+                        @Override
+                        public void execute(Transaction tx) throws IOException {
+                            StoredDestination sd = getStoredDestination(dest, tx);
+                            for (Iterator<Entry<String, KahaSubscriptionCommand>> iterator = sd.subscriptions
+                                    .iterator(tx); iterator.hasNext();) {
+                                Entry<String, KahaSubscriptionCommand> entry = iterator.next();
+
+                                String subscriptionKey = entry.getKey();
+                                LastAck cursorPos = getLastAck(tx, sd, subscriptionKey);
+                                if (cursorPos != null) {
+                                    long size = getStoredMessageSize(tx, sd, subscriptionKey);
+                                    statistics.getMessageCount(subscriptionKey)
+                                            .setCount(getStoredMessageCount(tx, sd, subscriptionKey));
+                                    statistics.getMessageSize(subscriptionKey).addSize(size > 0 ? size : 0);
+                                }
+                            }
+                        }
+                    });
+                } finally {
+                    indexLock.writeLock().unlock();
+                }
+            }
+        }
 
         @Override
         public void recoverSubscription(String clientId, String subscriptionName, final MessageRecoveryListener listener)
@@ -1032,6 +1084,11 @@ public class KahaDBStore extends MessageDatabase implements PersistenceAdapter {
                 throw new RuntimeException(e);
             }
         }
+
+        @Override
+        public MessageStoreSubscriptionStatistics getMessageStoreSubStatistics() {
+            return messageStoreSubStats;
+        }
     }
 
     String subscriptionKey(String clientId, String subscriptionName) {

activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java

@@ -70,6 +70,8 @@ import org.apache.activemq.openwire.OpenWireFormat;
 import org.apache.activemq.protobuf.Buffer;
 import org.apache.activemq.store.MessageStore;
 import org.apache.activemq.store.MessageStoreStatistics;
+import org.apache.activemq.store.MessageStoreSubscriptionStatistics;
+import org.apache.activemq.store.TopicMessageStore;
 import org.apache.activemq.store.kahadb.data.KahaAckMessageFileMapCommand;
 import org.apache.activemq.store.kahadb.data.KahaAddMessageCommand;
 import org.apache.activemq.store.kahadb.data.KahaCommitCommand;
@@ -282,6 +284,7 @@ public abstract class MessageDatabase extends ServiceSupport implements BrokerSe
     private boolean compactAcksIgnoresStoreGrowth = false;
     private int checkPointCyclesWithNoGC;
     private int journalLogOnLastCompactionCheck;
+    private boolean enableSubscriptionStatistics = false;
 
     @Override
     public void doStart() throws Exception {
@@ -1420,7 +1423,7 @@ public abstract class MessageDatabase extends ServiceSupport implements BrokerSe
                 incrementAndAddSizeToStoreStat(command.getDestination(), location.getSize());
                 sd.orderIndex.put(tx, priority, id, new MessageKeys(command.getMessageId(), location));
                 if (sd.subscriptions != null && !sd.subscriptions.isEmpty(tx)) {
-                    addAckLocationForNewMessage(tx, sd, id);
+                    addAckLocationForNewMessage(tx, command.getDestination(), sd, id);
                 }
                 metadata.lastUpdate = location;
             } else {
@@ -1482,6 +1485,18 @@ public abstract class MessageDatabase extends ServiceSupport implements BrokerSe
                 //Remove the existing from the size
                 decrementAndSubSizeToStoreStat(command.getDestination(), previousKeys.location.getSize());
 
+                //update all the subscription metrics
+                if (enableSubscriptionStatistics && location.getSize() != previousKeys.location.getSize()) {
+                    Iterator<Entry<String, SequenceSet>> iter = sd.ackPositions.iterator(tx);
+                    while (iter.hasNext()) {
+                        Entry<String, SequenceSet> e = iter.next();
+                        if (e.getValue().contains(id)) {
+                            incrementAndAddSizeToStoreStat(key(command.getDestination()), e.getKey(), location.getSize());
+                            decrementAndSubSizeToStoreStat(key(command.getDestination()), e.getKey(), previousKeys.location.getSize());
+                        }
+                    }
+                }
+
                 // on first update previous is original location, on recovery/replay it may be the updated location
                 if(!previousKeys.location.equals(location)) {
                     sd.locationIndex.remove(tx, previousKeys.location);
@@ -1622,6 +1637,10 @@ public abstract class MessageDatabase extends ServiceSupport implements BrokerSe
             sd.subscriptionAcks.remove(tx, subscriptionKey);
             sd.subscriptionCache.remove(subscriptionKey);
             removeAckLocationsForSub(command, tx, sd, subscriptionKey);
+            MessageStoreSubscriptionStatistics subStats = getSubStats(key(command.getDestination()));
+            if (subStats != null) {
+                subStats.removeSubscription(subscriptionKey);
+            }
 
             if (sd.subscriptions.isEmpty(tx)) {
                 // remove the stored destination
@@ -2565,10 +2584,15 @@ public abstract class MessageDatabase extends ServiceSupport implements BrokerSe
      * @param kahaDestination
      */
     protected void clearStoreStats(KahaDestination kahaDestination) {
-        MessageStoreStatistics storeStats = getStoreStats(key(kahaDestination));
+        String key = key(kahaDestination);
+        MessageStoreStatistics storeStats = getStoreStats(key);
+        MessageStoreSubscriptionStatistics subStats = getSubStats(key);
         if (storeStats != null) {
             storeStats.reset();
         }
+        if (subStats != null) {
+            subStats.reset();
+        }
     }
 
     /**
@@ -2605,8 +2629,41 @@ public abstract class MessageDatabase extends ServiceSupport implements BrokerSe
         }
     }
 
+    protected void incrementAndAddSizeToStoreStat(KahaDestination kahaDestination, String subKey, long size) {
+        incrementAndAddSizeToStoreStat(key(kahaDestination), subKey, size);
+    }
+
+    protected void incrementAndAddSizeToStoreStat(String kahaDestKey, String subKey, long size) {
+        if (enableSubscriptionStatistics) {
+            MessageStoreSubscriptionStatistics subStats = getSubStats(kahaDestKey);
+            if (subStats != null && subKey != null) {
+                subStats.getMessageCount(subKey).increment();
+                if (size > 0) {
+                    subStats.getMessageSize(subKey).addSize(size);
+                }
+            }
+        }
+    }
+
+
+    protected void decrementAndSubSizeToStoreStat(String kahaDestKey, String subKey, long size) {
+        if (enableSubscriptionStatistics) {
+            MessageStoreSubscriptionStatistics subStats = getSubStats(kahaDestKey);
+            if (subStats != null && subKey != null) {
+                subStats.getMessageCount(subKey).decrement();
+                if (size > 0) {
+                    subStats.getMessageSize(subKey).addSize(-size);
+                }
+            }
+        }
+    }
+
+    protected void decrementAndSubSizeToStoreStat(KahaDestination kahaDestination, String subKey, long size) {
+        decrementAndSubSizeToStoreStat(key(kahaDestination), subKey, size);
+    }
+
     /**
-     * This is a map to cache DestinationStatistics for a specific
+     * This is a map to cache MessageStores for a specific
      * KahaDestination key
      */
     protected final ConcurrentMap<String, MessageStore> storeCache =
@@ -2631,6 +2688,20 @@ public abstract class MessageDatabase extends ServiceSupport implements BrokerSe
         return storeStats;
     }
 
+    protected MessageStoreSubscriptionStatistics getSubStats(String kahaDestKey) {
+        MessageStoreSubscriptionStatistics subStats = null;
+        try {
+            MessageStore messageStore = storeCache.get(kahaDestKey);
+            if (messageStore instanceof TopicMessageStore) {
+                subStats = ((TopicMessageStore)messageStore).getMessageStoreSubStatistics();
+            }
+        } catch (Exception e1) {
+             LOG.error("Getting size counter of destination failed", e1);
+        }
+
+        return subStats;
+    }
+
     /**
      * Determine whether this Destination matches the DestinationType
      *
@@ -2736,7 +2807,8 @@ public abstract class MessageDatabase extends ServiceSupport implements BrokerSe
     }
 
     // on a new message add, all existing subs are interested in this message
-    private void addAckLocationForNewMessage(Transaction tx, StoredDestination sd, Long messageSequence) throws IOException {
+    private void addAckLocationForNewMessage(Transaction tx, KahaDestination kahaDest,
+            StoredDestination sd, Long messageSequence) throws IOException {
         for(String subscriptionKey : sd.subscriptionCache) {
             SequenceSet sequences = sd.ackPositions.get(tx, subscriptionKey);
             if (sequences == null) {
@@ -2748,6 +2820,10 @@ public abstract class MessageDatabase extends ServiceSupport implements BrokerSe
                 sd.ackPositions.put(tx, subscriptionKey, sequences);
             }
 
+            MessageKeys key = sd.orderIndex.get(tx, messageSequence);
+            incrementAndAddSizeToStoreStat(kahaDest, subscriptionKey,
+                    key.location.getSize());
+
             Long count = sd.messageReferences.get(messageSequence);
             if (count == null) {
                 count = Long.valueOf(0L);
@@ -2819,6 +2895,10 @@ public abstract class MessageDatabase extends ServiceSupport implements BrokerSe
                     sd.ackPositions.remove(tx, subscriptionKey);
                 }
 
+                MessageKeys key = sd.orderIndex.get(tx, messageSequence);
+                decrementAndSubSizeToStoreStat(command.getDestination(), subscriptionKey,
+                        key.location.getSize());
+
                 // Check if the message is reference by any other subscription.
                 Long count = sd.messageReferences.get(messageSequence);
                 if (count != null) {
@@ -3786,4 +3866,22 @@ public abstract class MessageDatabase extends ServiceSupport implements BrokerSe
     public void setEnableAckCompaction(boolean enableAckCompaction) {
         this.enableAckCompaction = enableAckCompaction;
     }
+
+    /**
+     * @return
+     */
+    public boolean isEnableSubscriptionStatistics() {
+        return enableSubscriptionStatistics;
+    }
+
+    /**
+     * Enable caching statistics for each subscription to allow non-blocking
+     * retrieval of metrics.  This could incur some overhead to compute if there are a lot
+     * of subscriptions.
+     *
+     * @param enableSubscriptionStatistics
+     */
+    public void setEnableSubscriptionStatistics(boolean enableSubscriptionStatistics) {
+        this.enableSubscriptionStatistics = enableSubscriptionStatistics;
+    }
 }

activemq-kahadb-store/src/main/java/org/apache/activemq/store/kahadb/TempKahaDBStore.java

@@ -46,6 +46,7 @@ import org.apache.activemq.protobuf.Buffer;
 import org.apache.activemq.store.AbstractMessageStore;
 import org.apache.activemq.store.MessageRecoveryListener;
 import org.apache.activemq.store.MessageStore;
+import org.apache.activemq.store.MessageStoreSubscriptionStatistics;
 import org.apache.activemq.store.PersistenceAdapter;
 import org.apache.activemq.store.TopicMessageStore;
 import org.apache.activemq.store.TransactionRecoveryListener;
@@ -413,6 +414,13 @@ public class TempKahaDBStore extends TempMessageDatabase implements PersistenceA
             return 0;
         }
 
+        private final MessageStoreSubscriptionStatistics stats = new MessageStoreSubscriptionStatistics(false);
+
+        @Override
+        public MessageStoreSubscriptionStatistics getMessageStoreSubStatistics() {
+            return stats;
+        }
+
         @Override
         public void recoverSubscription(String clientId, String subscriptionName, final MessageRecoveryListener listener) throws Exception {
             final String subscriptionKey = subscriptionKey(clientId, subscriptionName);

activemq-unit-tests/src/test/java/org/apache/activemq/broker/region/cursors/AbstractPendingMessageCursorTest.java

@@ -21,8 +21,7 @@ import static org.junit.Assert.assertTrue;
 
 import java.io.IOException;
 import java.net.URI;
-import java.util.Arrays;
+import java.util.concurrent.TimeUnit;
-import java.util.Collection;
 import java.util.concurrent.atomic.AtomicLong;
 
 import javax.jms.Connection;
@@ -49,9 +48,11 @@ import org.apache.activemq.util.SubscriptionKey;
 import org.apache.activemq.util.Wait;
 import org.apache.activemq.util.Wait.Condition;
 import org.junit.After;
+import org.junit.Assume;
 import org.junit.Before;
+import org.junit.Rule;
 import org.junit.Test;
-import org.junit.runners.Parameterized.Parameters;
+import org.junit.rules.Timeout;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -71,22 +72,16 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
     protected String defaultQueueName = "test.queue";
     protected String defaultTopicName = "test.topic";
     protected static int maxMessageSize = 1000;
-    protected boolean prioritizedMessages;
+    protected final boolean prioritizedMessages;
+    protected boolean enableSubscriptionStatistics;
 
-    @Parameters(name="prioritizedMessages={0}")
+    @Rule
-    public static Collection<Object[]> data() {
+    public Timeout globalTimeout= new Timeout(60, TimeUnit.SECONDS);
-        return Arrays.asList(new Object[][] {
-                // use priority messages
-                {true},
-                // don't use priority messages
-                {false}
-        });
-    }
 
     /**
      * @param prioritizedMessages
      */
-    public AbstractPendingMessageCursorTest(boolean prioritizedMessages) {
+    public AbstractPendingMessageCursorTest(final boolean prioritizedMessages) {
         super();
         this.prioritizedMessages = prioritizedMessages;
     }
@@ -144,6 +139,9 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
 
     @Test
     public void testQueueMessageSize() throws Exception {
+        //doesn't apply to queues, only run once
+        Assume.assumeFalse(enableSubscriptionStatistics);
+
         AtomicLong publishedMessageSize = new AtomicLong();
 
         org.apache.activemq.broker.region.Queue dest = publishTestQueueMessages(200, publishedMessageSize);
@@ -153,6 +151,9 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
 
     @Test
     public void testQueueBrowserMessageSize() throws Exception {
+        //doesn't apply to queues, only run once
+        Assume.assumeFalse(enableSubscriptionStatistics);
+
         AtomicLong publishedMessageSize = new AtomicLong();
 
         org.apache.activemq.broker.region.Queue dest = publishTestQueueMessages(200, publishedMessageSize);
@@ -163,6 +164,9 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
 
     @Test
     public void testQueueMessageSizeNonPersistent() throws Exception {
+        //doesn't apply to queues, only run once
+        Assume.assumeFalse(enableSubscriptionStatistics);
+
         AtomicLong publishedMessageSize = new AtomicLong();
 
         org.apache.activemq.broker.region.Queue dest = publishTestQueueMessages(200,
@@ -172,6 +176,9 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
 
     @Test
     public void testQueueMessageSizePersistentAndNonPersistent() throws Exception {
+        //doesn't apply to queues, only run once
+        Assume.assumeFalse(enableSubscriptionStatistics);
+
         AtomicLong publishedNonPersistentMessageSize = new AtomicLong();
         AtomicLong publishedMessageSize = new AtomicLong();
 
@@ -185,6 +192,9 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
 
     @Test
     public void testQueueMessageSizeAfterConsumption() throws Exception {
+        //doesn't apply to queues, only run once
+        Assume.assumeFalse(enableSubscriptionStatistics);
+
         AtomicLong publishedMessageSize = new AtomicLong();
 
         org.apache.activemq.broker.region.Queue dest = publishTestQueueMessages(200, publishedMessageSize);
@@ -198,6 +208,9 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
 
     @Test
     public void testQueueMessageSizeAfterConsumptionNonPersistent() throws Exception {
+        //doesn't apply to queues, only run once
+        Assume.assumeFalse(enableSubscriptionStatistics);
+
         AtomicLong publishedMessageSize = new AtomicLong();
 
         org.apache.activemq.broker.region.Queue dest = publishTestQueueMessages(200, DeliveryMode.NON_PERSISTENT, publishedMessageSize);
@@ -209,7 +222,7 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
         verifyStoreStats(dest, 0, 0);
     }
 
-    @Test(timeout=60000)
+    @Test
     public void testTopicMessageSize() throws Exception {
         AtomicLong publishedMessageSize = new AtomicLong();
 
@@ -235,7 +248,7 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
         connection.close();
     }
 
-    @Test(timeout=60000)
+    @Test
     public void testTopicNonPersistentMessageSize() throws Exception {
         AtomicLong publishedMessageSize = new AtomicLong();
 
@@ -262,7 +275,7 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
         connection.close();
     }
 
-    @Test(timeout=60000)
+    @Test
     public void testTopicPersistentAndNonPersistentMessageSize() throws Exception {
         AtomicLong publishedMessageSize = new AtomicLong();
 
@@ -291,7 +304,7 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
         connection.close();
     }
 
-    @Test(timeout=60000)
+    @Test
     public void testMessageSizeOneDurable() throws Exception {
         AtomicLong publishedMessageSize = new AtomicLong();
         Connection connection = new ActiveMQConnectionFactory(brokerConnectURI).createConnection();
@@ -320,7 +333,7 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
         connection.close();
     }
 
-    @Test(timeout=60000)
+    @Test
     public void testMessageSizeOneDurablePartialConsumption() throws Exception {
         AtomicLong publishedMessageSize = new AtomicLong();
 
@@ -346,7 +359,7 @@ public abstract class AbstractPendingMessageCursorTest extends AbstractStoreStat
         connection.close();
     }
 
-    @Test(timeout=60000)
+    @Test
     public void testMessageSizeTwoDurables() throws Exception {
         AtomicLong publishedMessageSize = new AtomicLong();
 

activemq-unit-tests/src/test/java/org/apache/activemq/broker/region/cursors/KahaDBPendingMessageCursorTest.java

@@ -17,47 +17,78 @@
 package org.apache.activemq.broker.region.cursors;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
 
 import java.io.File;
 import java.io.IOException;
+import java.util.Arrays;
+import java.util.Collection;
 import java.util.concurrent.atomic.AtomicLong;
 
 import javax.jms.Connection;
 import javax.jms.DeliveryMode;
+import javax.jms.MessageProducer;
+import javax.jms.Session;
+import javax.jms.TopicSession;
+import javax.jms.TopicSubscriber;
 
 import org.apache.activemq.ActiveMQConnectionFactory;
 import org.apache.activemq.broker.BrokerService;
+import org.apache.activemq.broker.region.DurableTopicSubscription;
 import org.apache.activemq.broker.region.Topic;
+import org.apache.activemq.command.ActiveMQTextMessage;
+import org.apache.activemq.command.ActiveMQTopic;
+import org.apache.activemq.store.MessageStoreSubscriptionStatistics;
+import org.apache.activemq.store.TopicMessageStore;
+import org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter;
 import org.apache.activemq.util.SubscriptionKey;
+import org.apache.activemq.util.Wait;
+import org.apache.activemq.util.Wait.Condition;
 import org.apache.commons.io.FileUtils;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
  * This test checks that pending message metrics work properly with KahaDB
  *
- * AMQ-5923
+ * AMQ-5923, AMQ-6375
  *
  */
 @RunWith(Parameterized.class)
 public class KahaDBPendingMessageCursorTest extends
         AbstractPendingMessageCursorTest {
+
     protected static final Logger LOG = LoggerFactory
             .getLogger(KahaDBPendingMessageCursorTest.class);
 
+    @Parameters(name = "prioritizedMessages={0},enableSubscriptionStatistics={1}")
+    public static Collection<Object[]> data() {
+        return Arrays.asList(new Object[][] {
+                // use priority messages
+                { true, true },
+                { true, false },
+                // don't use priority messages
+                { false, true },
+                { false, false }
+        });
+    }
+
     @Rule
     public TemporaryFolder dataFileDir = new TemporaryFolder(new File("target"));
 
     /**
      * @param prioritizedMessages
      */
-    public KahaDBPendingMessageCursorTest(boolean prioritizedMessages) {
+    public KahaDBPendingMessageCursorTest(final boolean prioritizedMessages,
+            final boolean enableSubscriptionStatistics) {
         super(prioritizedMessages);
+        this.enableSubscriptionStatistics = enableSubscriptionStatistics;
     }
 
     @Override
@@ -71,7 +102,10 @@ public class KahaDBPendingMessageCursorTest extends
     protected void initPersistence(BrokerService brokerService)
             throws IOException {
         broker.setPersistent(true);
-        broker.setDataDirectoryFile(dataFileDir.getRoot());
+        KahaDBPersistenceAdapter persistenceAdapter = new KahaDBPersistenceAdapter();
+        persistenceAdapter.setDirectory(dataFileDir.getRoot());
+        persistenceAdapter.setEnableSubscriptionStatistics(enableSubscriptionStatistics);
+        broker.setPersistenceAdapter(persistenceAdapter);
     }
 
     /**
@@ -80,7 +114,7 @@ public class KahaDBPendingMessageCursorTest extends
      *
      * @throws Exception
      */
-    @Test(timeout=60000)
+    @Test
     public void testDurableMessageSizeAfterRestartAndPublish() throws Exception {
         AtomicLong publishedMessageSize = new AtomicLong();
 
@@ -97,13 +131,18 @@ public class KahaDBPendingMessageCursorTest extends
         verifyStoreStats(topic, 200, publishedMessageSize.get());
 
         //should be equal in this case
-        assertEquals(topic.getDurableTopicSubs().get(subKey).getPendingMessageSize(),
+        long beforeRestartSize = topic.getDurableTopicSubs().get(subKey).getPendingMessageSize();
+        assertEquals(beforeRestartSize,
                 topic.getMessageStore().getMessageStoreStatistics().getMessageSize().getTotalSize());
 
         // stop, restart broker and publish more messages
         stopBroker();
         this.setUpBroker(false);
 
+        //verify that after restart the size is the same as before restart on recovery
+        topic = (Topic) getBroker().getDestination(new ActiveMQTopic(defaultTopicName));
+        assertEquals(beforeRestartSize, topic.getDurableTopicSubs().get(subKey).getPendingMessageSize());
+
         connection = new ActiveMQConnectionFactory(brokerConnectURI).createConnection();
         connection.setClientID("clientId");
         connection.start();
@@ -117,7 +156,7 @@ public class KahaDBPendingMessageCursorTest extends
 
     }
 
-    @Test(timeout=60000)
+    @Test
     public void testMessageSizeTwoDurablesPartialConsumption() throws Exception {
         AtomicLong publishedMessageSize = new AtomicLong();
 
@@ -153,7 +192,7 @@ public class KahaDBPendingMessageCursorTest extends
      *
      * @throws Exception
      */
-    @Test(timeout=60000)
+    @Test
     public void testNonPersistentDurableMessageSize() throws Exception {
         AtomicLong publishedMessageSize = new AtomicLong();
 
@@ -170,4 +209,147 @@ public class KahaDBPendingMessageCursorTest extends
         verifyStoreStats(topic, 0, 0);
     }
 
+    /**
+     * Test that the subscription counters are properly set when enabled
+     * and not set when disabled
+     *
+     * @throws Exception
+     */
+    @Test
+    public void testEnabledSubscriptionStatistics() throws Exception {
+        AtomicLong publishedMessageSize = new AtomicLong();
+
+        Connection connection = new ActiveMQConnectionFactory(brokerConnectURI).createConnection();
+        connection.setClientID("clientId");
+        connection.start();
+
+        SubscriptionKey subKey = new SubscriptionKey("clientId", "sub1");
+        SubscriptionKey subKey2 = new SubscriptionKey("clientId", "sub2");
+        org.apache.activemq.broker.region.Topic dest = publishTestMessagesDurable(
+                connection, new String[] {"sub1", "sub2"}, 200, publishedMessageSize, DeliveryMode.PERSISTENT);
+
+        TopicMessageStore store = (TopicMessageStore) dest.getMessageStore();
+        MessageStoreSubscriptionStatistics stats = store.getMessageStoreSubStatistics();
+        if (enableSubscriptionStatistics) {
+            assertTrue(stats.getMessageCount(subKey.toString()).getCount() == 200);
+            assertTrue(stats.getMessageSize(subKey.toString()).getTotalSize() > 0);
+            assertTrue(stats.getMessageCount(subKey2.toString()).getCount() == 200);
+            assertTrue(stats.getMessageSize(subKey2.toString()).getTotalSize() > 0);
+            assertEquals(stats.getMessageCount().getCount(),
+                    stats.getMessageCount(subKey.toString()).getCount() +
+                    stats.getMessageSize(subKey.toString()).getCount());
+            assertEquals(stats.getMessageSize().getTotalSize(),
+                    stats.getMessageSize(subKey.toString()).getTotalSize() +
+                    stats.getMessageSize(subKey2.toString()).getTotalSize());
+
+            //Delete second subscription and verify stats are updated accordingly
+            store.deleteSubscription(subKey2.getClientId(), subKey2.getSubscriptionName());
+            assertEquals(stats.getMessageCount().getCount(), stats.getMessageCount(subKey.toString()).getCount());
+            assertEquals(stats.getMessageSize().getTotalSize(), stats.getMessageSize(subKey.toString()).getTotalSize());
+            assertTrue(stats.getMessageCount(subKey2.toString()).getCount() == 0);
+            assertTrue(stats.getMessageSize(subKey2.toString()).getTotalSize() == 0);
+
+        } else {
+            assertTrue(stats.getMessageCount(subKey.toString()).getCount() == 0);
+            assertTrue(stats.getMessageSize(subKey.toString()).getTotalSize() == 0);
+            assertTrue(stats.getMessageCount(subKey2.toString()).getCount() == 0);
+            assertTrue(stats.getMessageSize(subKey2.toString()).getTotalSize() == 0);
+            assertEquals(0, stats.getMessageCount().getCount());
+            assertEquals(0, stats.getMessageSize().getTotalSize());
+        }
+
+    }
+
+    @Test
+    public void testUpdateMessageSubSize() throws Exception {
+        Connection connection = new ActiveMQConnectionFactory(brokerConnectURI).createConnection();
+        connection.setClientID("clientId");
+        connection.start();
+        Session session = connection.createSession(false, TopicSession.AUTO_ACKNOWLEDGE);
+        javax.jms.Topic dest = session.createTopic(defaultTopicName);
+        session.createDurableSubscriber(dest, "sub1");
+        session.createDurableSubscriber(dest, "sub2");
+        MessageProducer prod = session.createProducer(dest);
+
+        ActiveMQTextMessage message = new ActiveMQTextMessage();
+        message.setText("SmallMessage");
+        prod.send(message);
+
+        SubscriptionKey subKey = new SubscriptionKey("clientId", "sub1");
+        SubscriptionKey subKey2 = new SubscriptionKey("clientId", "sub1");
+
+        final Topic topic =  (Topic) getBroker().getDestination(new ActiveMQTopic(defaultTopicName));
+        final DurableTopicSubscription sub = topic.getDurableTopicSubs().get(subKey);
+        final DurableTopicSubscription sub2 = topic.getDurableTopicSubs().get(subKey2);
+        long sizeBeforeUpdate = sub.getPendingMessageSize();
+
+        message = (ActiveMQTextMessage) topic.getMessageStore().getMessage(message.getMessageId());
+        message.setText("LargerMessageLargerMessage");
+
+        //update the message
+        topic.getMessageStore().updateMessage(message);
+
+        //should be at least 10 bytes bigger and match the store size
+        assertTrue(sub.getPendingMessageSize() > sizeBeforeUpdate + 10);
+        assertEquals(sub.getPendingMessageSize(), topic.getMessageStore().getMessageSize());
+        assertEquals(sub.getPendingMessageSize(), sub2.getPendingMessageSize());
+    }
+
+    @Test
+    public void testUpdateMessageSubSizeAfterConsume() throws Exception {
+        Connection connection = new ActiveMQConnectionFactory(brokerConnectURI).createConnection();
+        connection.setClientID("clientId");
+        connection.start();
+        Session session = connection.createSession(false, TopicSession.AUTO_ACKNOWLEDGE);
+        javax.jms.Topic dest = session.createTopic(defaultTopicName);
+        session.createDurableSubscriber(dest, "sub1");
+        TopicSubscriber subscriber2 = session.createDurableSubscriber(dest, "sub2");
+        MessageProducer prod = session.createProducer(dest);
+
+        ActiveMQTextMessage message = new ActiveMQTextMessage();
+        message.setText("SmallMessage");
+        ActiveMQTextMessage message2 = new ActiveMQTextMessage();
+        message2.setText("SmallMessage2");
+        prod.send(message);
+        prod.send(message2);
+
+        //Receive first message for sub 2 and wait for stats to update
+        subscriber2.receive();
+
+        SubscriptionKey subKey = new SubscriptionKey("clientId", "sub1");
+        SubscriptionKey subKey2 = new SubscriptionKey("clientId", "sub2");
+        final Topic topic =  (Topic) getBroker().getDestination(new ActiveMQTopic(defaultTopicName));
+        final DurableTopicSubscription sub = topic.getDurableTopicSubs().get(subKey);
+        final DurableTopicSubscription sub2 = topic.getDurableTopicSubs().get(subKey2);
+
+        Wait.waitFor(new Condition() {
+
+            @Override
+            public boolean isSatisified() throws Exception {
+                return sub.getPendingMessageSize() > sub2.getPendingMessageSize();
+            }
+        });
+
+        long sizeBeforeUpdate = sub.getPendingMessageSize();
+        long sizeBeforeUpdate2 = sub2.getPendingMessageSize();
+
+        //update message 2
+        message = (ActiveMQTextMessage) topic.getMessageStore().getMessage(message.getMessageId());
+        message.setText("LargerMessageLargerMessage");
+
+        //update the message
+        topic.getMessageStore().updateMessage(message);
+
+        //should be at least 10 bytes bigger and match the store size
+        assertTrue(sub.getPendingMessageSize() > sizeBeforeUpdate + 10);
+        assertEquals(sub.getPendingMessageSize(), topic.getMessageStore().getMessageSize());
+
+        //Sub2 only has 1 message so should be less than sub, verify that the update message
+        //didn't update the stats of sub2 and sub1 should be over twice as large since the
+        //updated message is bigger
+        assertTrue(sub.getPendingMessageSize() > 2 * sub2.getPendingMessageSize());
+        assertEquals(sizeBeforeUpdate2, sub2.getPendingMessageSize());
+
+    }
+
 }

activemq-unit-tests/src/test/java/org/apache/activemq/broker/region/cursors/MemoryPendingMessageCursorTest.java

@@ -17,6 +17,8 @@
 package org.apache.activemq.broker.region.cursors;
 
 import java.io.IOException;
+import java.util.Arrays;
+import java.util.Collection;
 import java.util.concurrent.atomic.AtomicLong;
 
 import javax.jms.Connection;
@@ -29,6 +31,7 @@ import org.apache.activemq.util.SubscriptionKey;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.Parameterized;
+import org.junit.runners.Parameterized.Parameters;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -44,6 +47,15 @@ public class MemoryPendingMessageCursorTest extends AbstractPendingMessageCursor
             .getLogger(MemoryPendingMessageCursorTest.class);
 
 
+    @Parameters(name = "prioritizedMessages={0}")
+    public static Collection<Object[]> data() {
+        return Arrays.asList(new Object[][] {
+                // use priority messages
+                { true },
+                // don't use priority messages
+                { false } });
+    }
+
     public MemoryPendingMessageCursorTest(boolean prioritizedMessages) {
         super(prioritizedMessages);
     }
@@ -56,7 +68,7 @@ public class MemoryPendingMessageCursorTest extends AbstractPendingMessageCursor
 
 
     @Override
-    @Test(timeout=30000)
+    @Test
     public void testMessageSizeOneDurable() throws Exception {
         AtomicLong publishedMessageSize = new AtomicLong();
         Connection connection = new ActiveMQConnectionFactory(brokerConnectURI).createConnection();
@@ -85,7 +97,7 @@ public class MemoryPendingMessageCursorTest extends AbstractPendingMessageCursor
     }
 
     @Override
-    @Test(timeout=30000)
+    @Test
     public void testMessageSizeTwoDurables() throws Exception {
         AtomicLong publishedMessageSize = new AtomicLong();
 
@@ -117,7 +129,7 @@ public class MemoryPendingMessageCursorTest extends AbstractPendingMessageCursor
     }
 
     @Override
-    @Test(timeout=30000)
+    @Test
     public void testMessageSizeOneDurablePartialConsumption() throws Exception {
         AtomicLong publishedMessageSize = new AtomicLong();
 

activemq-unit-tests/src/test/java/org/apache/activemq/broker/region/cursors/MultiKahaDBPendingMessageCursorTest.java

@@ -37,8 +37,9 @@ public class MultiKahaDBPendingMessageCursorTest extends
     /**
      * @param prioritizedMessages
      */
-    public MultiKahaDBPendingMessageCursorTest(boolean prioritizedMessages) {
+    public MultiKahaDBPendingMessageCursorTest(final boolean prioritizedMessages,
-        super(prioritizedMessages);
+            final boolean enableSubscriptionStatistics) {
+        super(prioritizedMessages, enableSubscriptionStatistics);
     }
 
     @Override
@@ -52,6 +53,7 @@ public class MultiKahaDBPendingMessageCursorTest extends
 
         KahaDBPersistenceAdapter kahaStore = new KahaDBPersistenceAdapter();
         kahaStore.setJournalMaxFileLength(1024 * 512);
+        kahaStore.setEnableSubscriptionStatistics(enableSubscriptionStatistics);
 
         //set up a store per destination
         FilteredKahaDBPersistenceAdapter filtered = new FilteredKahaDBPersistenceAdapter();