https://issues.apache.org/jira/browse/AMQ-3805 - duplicate dispatch to durable sub with concurrent send transaction commit and activate. fixed up the use of audit through an activate/deactivate such that duplicate dispatch is suppressed at source in this case

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1325722 13f79535-47bb-0310-9956-ffa450edef68

activemq-core/src/main/java/org/apache/activemq/broker/region/DurableTopicSubscription.java

@@ -163,7 +163,7 @@ public class DurableTopicSubscription extends PrefetchSubscription implements Us
     }
 
     public void deactivate(boolean keepDurableSubsActive) throws Exception {
-        LOG.debug("Deactivating " + this);
+        LOG.debug("Deactivating keepActive=" + keepDurableSubsActive + ", " + this);
         active.set(false);
         offlineTimestamp.set(System.currentTimeMillis());
         this.usageManager.getMemoryUsage().removeUsageListener(this);
@@ -187,9 +187,10 @@ public class DurableTopicSubscription extends PrefetchSubscription implements Us
             } else {
                 redeliveredMessages.put(node.getMessageId(), Integer.valueOf(1));
             }
-            if (keepDurableSubsActive&& pending.isTransient()) {
+            if (keepDurableSubsActive && pending.isTransient()) {
                 synchronized (pending) {
                     pending.addMessageFirst(node);
+                    pending.rollback(node.getMessageId());
                 }
             } else {
                 node.decrementReferenceCount();

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

@@ -64,7 +64,6 @@ public abstract class AbstractPendingMessageCursor implements PendingMessageCurs
 
     public synchronized void stop() throws Exception  {
         started=false;
-        audit=null;
         gc();
     }
 

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

@@ -243,6 +243,7 @@ public abstract class AbstractStoreCursor extends AbstractPendingMessageCursor i
         batchList.clear();
         clearIterator(false);
         batchResetNeeded = true;
+        // wonder do we need to determine size here, it may change before restart
         resetSize();
         setCacheEnabled(false);
     }

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

@@ -93,16 +93,15 @@ public class StoreDurableSubscriberCursor extends AbstractPendingMessageCursor {
         if (isStarted()) {
             if (subscription.isKeepDurableSubsActive()) {
                 super.gc();
-                super.getMessageAudit().clear();
                 for (PendingMessageCursor tsp : storePrefetches) {
                     tsp.gc();
-                    tsp.getMessageAudit().clear();
                 }
             } else {
                 super.stop();
                 for (PendingMessageCursor tsp : storePrefetches) {
                     tsp.stop();
                 }
+                getMessageAudit().clear();
             }
         }
     }

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

@@ -119,6 +119,6 @@ class TopicStorePrefetch extends AbstractStoreCursor {
 
     @Override
     public String toString() {
-        return "TopicStorePrefetch(" + clientId + "," + subscriberName + ")" + super.toString();
+        return "TopicStorePrefetch(" + clientId + "," + subscriberName + ") " + this.subscription.getConsumerInfo().getConsumerId() + " - " + super.toString();
     }
 }

activemq-core/src/test/java/org/apache/activemq/usecases/DurableSubProcessConcurrentCommitActivateNoDuplicateTest.java

@@ -0,0 +1,942 @@
+/**
+ * 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 ONDITIONS 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.usecases;
+
+import java.io.File;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Date;
+import java.util.HashSet;
+import java.util.Vector;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.ReentrantReadWriteLock;
+import javax.jms.Connection;
+import javax.jms.ConnectionFactory;
+import javax.jms.JMSException;
+import javax.jms.Message;
+import javax.jms.MessageProducer;
+import javax.jms.Session;
+
+import org.apache.activemq.ActiveMQConnection;
+import org.apache.activemq.ActiveMQConnectionFactory;
+import org.apache.activemq.ActiveMQMessageConsumer;
+import org.apache.activemq.broker.BrokerFactory;
+import org.apache.activemq.broker.BrokerService;
+import org.apache.activemq.broker.region.policy.PolicyEntry;
+import org.apache.activemq.broker.region.policy.PolicyMap;
+import org.apache.activemq.command.ActiveMQTopic;
+import org.apache.activemq.store.amq.AMQPersistenceAdapter;
+import org.apache.activemq.store.kahadaptor.KahaPersistenceAdapter;
+import org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter;
+import org.apache.activemq.util.ThreadTracker;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+import static org.junit.Assert.assertTrue;
+
+public class DurableSubProcessConcurrentCommitActivateNoDuplicateTest {
+    private static final Logger LOG = LoggerFactory.getLogger(DurableSubProcessConcurrentCommitActivateNoDuplicateTest.class);
+    public static final long RUNTIME = 5 * 60 * 1000;
+
+    public static final int SERVER_SLEEP = 500; // max
+    public static final int CARGO_SIZE = 600; // max
+
+    public static final int MAX_CLIENTS = 2;
+    public static final Random CLIENT_LIFETIME = new Random(30 * 1000, 2 * 60 * 1000);
+    public static final Random CLIENT_ONLINE = new Random(30 * 1000, 40 * 1000);
+    public static final Random CLIENT_OFFLINE = new Random(1 * 1000, 10 * 1000);
+
+    public static final int CLIENT_OFFLINE_DURING_COMMIT = 2; // random(x) == x
+            
+    public static final Persistence PERSISTENT_ADAPTER = Persistence.KAHADB;
+    
+    public static final long BROKER_RESTART = -2 * 60 * 1000;
+
+    public static final boolean ALLOW_SUBSCRIPTION_ABANDONMENT = true;
+    public static final boolean CHECK_REDELIVERY = true;
+
+    private BrokerService broker;
+    private ActiveMQTopic topic;
+
+    private ClientManager clientManager;
+    private Server server;
+    private HouseKeeper houseKeeper;
+
+    private final ReentrantReadWriteLock processLock = new ReentrantReadWriteLock(
+            true);
+    private int restartCount = 0;
+    private final AtomicInteger onlineCount = new AtomicInteger(0);
+    static final Vector<Throwable> exceptions = new Vector<Throwable>();
+
+    // long form of test that found https://issues.apache.org/jira/browse/AMQ-3805
+    @Ignore ("short version in org.apache.activemq.usecases.DurableSubscriptionOfflineTest.testNoDuplicateOnConcurrentSendTranCommitAndActivate")
+    @Test
+    public void testProcess() {
+        try {
+            server.start();
+            clientManager.start();
+
+            if (ALLOW_SUBSCRIPTION_ABANDONMENT)
+                houseKeeper.start();
+
+            if (BROKER_RESTART <= 0)
+                Thread.sleep(RUNTIME);
+            else {
+                long end = System.currentTimeMillis() + RUNTIME;
+
+                while (true) {
+                    long now = System.currentTimeMillis();
+                    if (now > end)
+                        break;
+
+                    now = end - now;
+                    now = now < BROKER_RESTART ? now : BROKER_RESTART;
+                    Thread.sleep(now);
+
+                    restartBroker();
+                }
+            }
+        } catch (Throwable e) {
+            exit("ProcessTest.testProcess failed.", e);
+        }
+
+        //allow the clients to unsubscribe before finishing
+        clientManager.setEnd(true);
+        try {
+			Thread.sleep(600000);
+		} catch (InterruptedException e) {
+			 exit("ProcessTest.testProcess failed.", e);
+		}
+        
+        
+        processLock.writeLock().lock();
+        assertTrue("no exceptions: " + exceptions, exceptions.isEmpty());
+        LOG.info("DONE.");
+    }
+
+    private void restartBroker() throws Exception {
+        LOG.info("Broker restart: waiting for components.");
+
+        processLock.writeLock().lock();
+        try {
+            destroyBroker();
+            startBroker(false);
+
+            restartCount++;
+            LOG.info("Broker restarted. count: " + restartCount);
+        } finally {
+            processLock.writeLock().unlock();
+        }
+    }
+
+    /**
+     * Creates batch of messages in a transaction periodically. The last message
+     * in the transaction is always a special message what contains info about
+     * the whole transaction.
+     * <p>
+     * Notifies the clients about the created messages also.
+     */
+    final class Server extends Thread {
+
+        final String url = "vm://"
+                + DurableSubProcessConcurrentCommitActivateNoDuplicateTest.getName()
+                + "?"
+                + "jms.redeliveryPolicy.maximumRedeliveries=2&jms.redeliveryPolicy.initialRedeliveryDelay=500&"
+                + "jms.producerWindowSize=20971520&jms.prefetchPolicy.all=100&"
+                + "jms.copyMessageOnSend=false&jms.disableTimeStampsByDefault=false&"
+                + "jms.alwaysSyncSend=true&jms.dispatchAsync=false&"
+                + "jms.watchTopicAdvisories=false&"
+                + "waitForStart=200&create=false";
+        final ConnectionFactory cf = new ActiveMQConnectionFactory(url);
+
+        final Object sendMutex = new Object();
+        final String[] cargos = new String[500];
+
+        int transRover = 0;
+        int messageRover = 0;
+        public volatile int committingTransaction = -1;        
+
+        public Server() {
+            super("Server");
+            setPriority(Thread.MIN_PRIORITY);
+            setDaemon(true);
+        }
+
+        @Override
+        public void run() {
+            try {
+                while (true) {
+
+                	Thread.sleep(1000);
+                	
+                    processLock.readLock().lock();
+                    try {
+                        send();
+                    } finally {
+                        processLock.readLock().unlock();
+                    }
+                }
+            } catch (Throwable e) {
+                exit("Server.run failed", e);
+            }
+        }
+
+        public void send() throws JMSException {
+            // do not create new clients now
+            // ToDo: Test this case later.
+            synchronized (sendMutex) {
+                int trans = ++transRover;
+                boolean relevantTrans = true; //random(2) > 1;
+                ClientType clientType = relevantTrans ? ClientType
+                        .randomClientType() : null; // sends this types
+                //int count = random(500, 700);
+                int count = 1000;
+
+                LOG.info("Sending Trans[id=" + trans + ", count="
+                        + count + ", clientType=" + clientType + ", firstID=" + (messageRover+1) + "]");
+
+                Connection con = cf.createConnection();
+                Session sess = con
+                        .createSession(true, Session.SESSION_TRANSACTED);
+                MessageProducer prod = sess.createProducer(null);
+
+                for (int i = 0; i < count; i++) {
+                    Message message = sess.createMessage();
+                    message.setIntProperty("ID", ++messageRover);
+                    message.setIntProperty("TRANS", trans);
+                    String type = clientType != null ? clientType
+                            .randomMessageType() : ClientType
+                            .randomNonRelevantMessageType();
+                    message.setStringProperty("TYPE", type);
+
+                    if (CARGO_SIZE > 0)
+                        message.setStringProperty("CARGO",
+                                getCargo(random(CARGO_SIZE)));
+
+                    prod.send(topic, message);
+                    clientManager.onServerMessage(message);
+                }
+
+                Message message = sess.createMessage();
+                message.setIntProperty("ID", ++messageRover);
+                message.setIntProperty("TRANS", trans);
+                message.setBooleanProperty("COMMIT", true);
+                message.setBooleanProperty("RELEVANT", relevantTrans);
+                prod.send(topic, message);
+                clientManager.onServerMessage(message);
+
+                committingTransaction = trans;
+                sess.commit();
+                committingTransaction = -1;
+
+                LOG.info("Committed Trans[id=" + trans + ", count="
+                        + count + ", clientType=" + clientType + "], ID=" + messageRover);
+
+                sess.close();
+                con.close();
+            }
+        }
+
+        private String getCargo(int length) {
+            if (length == 0)
+                return null;
+
+            if (length < cargos.length) {
+                String result = cargos[length];
+                if (result == null) {
+                    result = getCargoImpl(length);
+                    cargos[length] = result;
+                }
+                return result;
+            }
+            return getCargoImpl(length);
+        }
+
+        private String getCargoImpl(int length) {
+            StringBuilder sb = new StringBuilder(length);
+            for (int i = length; --i >= 0;) {
+                sb.append('a');
+            }
+            return sb.toString();
+        }
+    }
+
+    /**
+     * Clients listen on different messages in the topic. The 'TYPE' property
+     * helps the client to select the proper messages.
+     */
+    private enum ClientType {
+        A("a", "b", "c"), B("c", "d", "e"), C("d", "e", "f"), D("g", "h");
+
+        public final String[] messageTypes;
+        public final HashSet<String> messageTypeSet;
+        public final String selector;
+
+        ClientType(String... messageTypes) {
+            this.messageTypes = messageTypes;
+            messageTypeSet = new HashSet<String>(Arrays.asList(messageTypes));
+
+            StringBuilder sb = new StringBuilder("TYPE in (");
+            for (int i = 0; i < messageTypes.length; i++) {
+                if (i > 0)
+                    sb.append(", ");
+                sb.append('\'').append(messageTypes[i]).append('\'');
+            }
+            sb.append(')');
+            selector = sb.toString();
+        }
+
+        public static ClientType randomClientType() {
+            return values()[DurableSubProcessConcurrentCommitActivateNoDuplicateTest
+                    .random(values().length - 1)];
+        }
+
+        public final String randomMessageType() {
+            return messageTypes[DurableSubProcessConcurrentCommitActivateNoDuplicateTest
+                    .random(messageTypes.length - 1)];
+        }
+
+        public static String randomNonRelevantMessageType() {
+            return Integer
+                    .toString(DurableSubProcessConcurrentCommitActivateNoDuplicateTest.random(20));
+        }
+
+        public final boolean isRelevant(String messageType) {
+            return messageTypeSet.contains(messageType);
+        }
+
+        @Override
+        public final String toString() {
+            return this.name() /* + '[' + selector + ']' */;
+        }
+    }
+
+    /**
+     * Creates new cliens.
+     */
+    private final class ClientManager extends Thread {
+
+        private int clientRover = 0;
+
+        private final CopyOnWriteArrayList<Client> clients = new CopyOnWriteArrayList<Client>();
+
+		private boolean end;
+
+        public ClientManager() {
+            super("ClientManager");
+            setDaemon(true);
+        }
+
+        public synchronized void setEnd(boolean end) {
+			this.end = end;
+			
+		}
+
+		@Override
+        public void run() {
+            try {
+                while (true) {
+                    if (clients.size() < MAX_CLIENTS && !end) {
+                        processLock.readLock().lock();
+                        try {
+                            createNewClient();
+                        } finally {
+                            processLock.readLock().unlock();
+                        }
+                    }
+
+                    int size = clients.size();
+                    //sleepRandom(1000, 4000);
+                    Thread.sleep(100);
+                }
+            } catch (Throwable e) {
+                exit("ClientManager.run failed.", e);
+            }
+        }
+
+        private void createNewClient() throws JMSException {
+            ClientType type = ClientType.randomClientType();
+
+            Client client;
+            synchronized (server.sendMutex) {
+                client = new Client(++clientRover, type, CLIENT_LIFETIME,
+                        CLIENT_ONLINE, CLIENT_OFFLINE);
+                clients.add(client);
+            }
+            client.start();
+
+            LOG.info(client.toString() + " created. " + this);
+        }
+
+        public void removeClient(Client client) {
+            clients.remove(client);
+        }
+
+        public void onServerMessage(Message message) throws JMSException {
+            for (Client client : clients) {
+                client.onServerMessage(message);
+            }
+        }
+
+        @Override
+        public String toString() {
+            StringBuilder sb = new StringBuilder("ClientManager[count=");
+            sb.append(clients.size());
+            sb.append(", clients=");
+            boolean sep = false;
+            for (Client client : clients) {
+                if (sep)
+                    sb.append(", ");
+                else
+                    sep = true;
+                sb.append(client.toString());
+            }
+            sb.append(']');
+            return sb.toString();
+        }
+    }
+
+    /**
+     * Consumes massages from a durable subscription. Goes online/offline
+     * periodically. Checks the incoming messages against the sent messages of
+     * the server.
+     */
+    private final class Client extends Thread {
+
+        String url = "failover:(tcp://localhost:61656?wireFormat.maxInactivityDuration=0)?"
+                + "jms.watchTopicAdvisories=false&"
+                + "jms.alwaysSyncSend=true&jms.dispatchAsync=true&"
+                + "jms.producerWindowSize=20971520&"
+                + "jms.copyMessageOnSend=false&"
+                + "jms.sendAcksAsync=false&"
+                + "initialReconnectDelay=100&maxReconnectDelay=30000&"
+                + "useExponentialBackOff=true";
+        final ConnectionFactory cf = new ActiveMQConnectionFactory(url);
+
+        public static final String SUBSCRIPTION_NAME = "subscription";
+
+        private final int id;
+        private final String conClientId;
+
+        private final Random lifetime;
+        private final Random online;
+        private final Random offline;
+
+        private final ClientType clientType;
+        private final String selector;
+
+        private final ConcurrentLinkedQueue<Message> waitingList = new ConcurrentLinkedQueue<Message>();
+        private final HashSet<Integer> processed = CHECK_REDELIVERY ? new HashSet<Integer>(
+                10000) : null;
+
+        private ActiveMQMessageConsumer consumer = null;
+
+        public Client(int id, ClientType clientType, Random lifetime,
+                Random online, Random offline) throws JMSException {
+            super("Client" + id);
+            setDaemon(true);
+
+            this.id = id;
+            conClientId = "cli" + id;
+            this.clientType = clientType;
+            selector = "(COMMIT = true and RELEVANT = true) or "
+                    + clientType.selector;
+
+            this.lifetime = lifetime;
+            this.online = online;
+            this.offline = offline;
+
+            subscribe();
+        }
+
+        @Override
+        public void run() {
+            long end = System.currentTimeMillis() + 60000;
+            try {
+                boolean sleep = false;
+                while (true) {
+                    long max = end - System.currentTimeMillis();
+                    if (max <= 0)
+                        break;
+
+                    /*
+                    if (sleep)
+                        offline.sleepRandom();
+                    else
+                        sleep = true;
+					*/
+                    
+                    Thread.sleep(100);
+                    
+                    processLock.readLock().lock();
+                    onlineCount.incrementAndGet();
+                    try {
+                        process(online.next());
+                    } finally {
+                        onlineCount.decrementAndGet();
+                        processLock.readLock().unlock();
+                    }
+                }
+
+                if (!ALLOW_SUBSCRIPTION_ABANDONMENT || random(1) > 0)
+                    unsubscribe();
+                else {
+                    LOG.info("Client abandon the subscription. "
+                            + this);
+
+                    // housekeeper should sweep these abandoned subscriptions
+                    houseKeeper.abandonedSubscriptions.add(conClientId);
+                }
+            } catch (Throwable e) {
+                exit(toString() + " failed.", e);
+            }
+
+            clientManager.removeClient(this);
+            LOG.info(toString() + " DONE.");
+        }
+
+        private void process(long millis) throws JMSException {
+            //long end = System.currentTimeMillis() + millis;
+        	long end = System.currentTimeMillis() + 200;
+            long hardEnd = end + 20000; // wait to finish the transaction.
+            boolean inTransaction = false;
+            int transCount = 0;
+
+            Connection con = openConnection();
+            Session sess = con.createSession(false, Session.CLIENT_ACKNOWLEDGE);
+            consumer = (ActiveMQMessageConsumer) sess.createDurableSubscriber(topic,
+                    SUBSCRIPTION_NAME, selector, false);
+            LOG.info(toString() + " ONLINE.");
+            try {
+                do {
+                    long max = end - System.currentTimeMillis();
+                    if (max <= 0) {
+                        if (!inTransaction) {
+                            LOG.info(toString() + " done after no work!");
+                            break;
+                        }
+
+                        max = hardEnd - System.currentTimeMillis();
+                        if (max <= 0)
+                            exit("" + this
+                                    + " failed: Transaction is not finished.");
+                    }
+
+                    Message message = consumer.receive(max);
+                    if (message == null)
+                        continue;
+
+                    onClientMessage(message);
+
+                    if (message.propertyExists("COMMIT")) {
+                        message.acknowledge(); // CLIENT_ACKNOWLEDGE
+
+                        int trans = message.getIntProperty("TRANS");
+                        LOG.info("Received Trans[id="
+                                + trans + ", count="
+                                + transCount + "] in " + this + ".");
+
+                        inTransaction = false;
+                        transCount = 0;
+                        
+                        int committing = server.committingTransaction;
+                        if (committing == trans) {
+                            LOG.info("Going offline during transaction commit. messageID=" + message.getIntProperty("ID"));
+                            break;
+                        }
+                    } else {
+                        inTransaction = true;
+                        transCount++;
+                        if (1 == transCount) {
+                            LOG.info("In Trans[id=" + message.getIntProperty("TRANS") + "] first ID=" + message.getIntProperty("ID"));
+                        }
+                    }
+                } while (true);
+            } finally {
+                sess.close();
+                con.close();
+
+                LOG.info(toString() + " OFFLINE.");
+
+                // Check if the messages are in the waiting
+                // list for long time.
+                Message topMessage = waitingList.peek();
+                if (topMessage != null)
+                    checkDeliveryTime(topMessage);
+            }
+        }
+
+        public void onServerMessage(Message message) throws JMSException {
+            if (Boolean.TRUE.equals(message.getObjectProperty("COMMIT"))) {
+                if (Boolean.TRUE.equals(message.getObjectProperty("RELEVANT")))
+                    waitingList.add(message);
+            } else {
+                String messageType = message.getStringProperty("TYPE");
+                if (clientType.isRelevant(messageType))
+                    waitingList.add(message);
+            }
+        }
+
+        public void onClientMessage(Message message) {
+            Message serverMessage = waitingList.poll();
+            try {
+                Integer receivedId = (Integer) message.getObjectProperty("ID");
+                if (processed != null && processed.contains(receivedId))
+                    LOG.info("! Message has been processed before. "
+                            + this + " redeliveredFlag=" + message.getJMSRedelivered() + ", message = " + message);
+
+                if (serverMessage == null)
+                    exit(""
+                            + this
+                            + " failed: There is no next server message, but received: "
+                            + message);
+
+                Integer serverId = (Integer) serverMessage
+                        .getObjectProperty("ID");
+                if (receivedId == null || serverId == null)
+                    exit("" + this + " failed: message ID not found.\r\n"
+                            + " received: " + message + "\r\n" + "   server: "
+                            + serverMessage);
+
+                if (!serverId.equals(receivedId)) {
+                    StringBuilder missingList = new StringBuilder();
+                    Object lastTrans = null;
+                    int transCount = 0;
+                    Message nextServerMessage = serverMessage;
+                    do {
+                        Integer nextServerId = (Integer) nextServerMessage.getObjectProperty("ID");
+                        if (nextServerId.equals(receivedId)) {
+                            if (lastTrans != null)
+                                missingList.append("Missing TRANS=").append(lastTrans).append(", size=").append(transCount).append("\r\n");
+                            break;
+                        }
+
+                        Object trans = nextServerMessage.getObjectProperty("TRANS");
+                        if (!trans.equals(lastTrans)) {
+                            if (lastTrans != null)
+                                missingList.append("Missing TRANS=").append(lastTrans).append(", size=").append(transCount).append("\r\n");
+                            lastTrans = trans;
+                            transCount = 1;
+                        }
+                        else
+                            transCount++;
+                    } while ((nextServerMessage = waitingList.poll()) != null);
+
+                    exit("Missing messages!\r\n" + missingList +
+                            "Received message: " + message + "\r\n" +
+                            "Expected message: " + serverMessage);
+                }
+
+                checkDeliveryTime(message);
+
+                if (processed != null)
+                    processed.add(receivedId);
+            } catch (Throwable e) {
+                exit("" + this + ".onClientMessage failed.\r\n" + " received: "
+                        + message + "\r\n" + "   server: " + serverMessage, e);
+            }
+        }
+
+        /**
+         * Checks if the message was not delivered fast enough.
+         */
+        public void checkDeliveryTime(Message message) throws JMSException {
+            long creation = message.getJMSTimestamp();
+            long min = System.currentTimeMillis() - (offline.max + online.min)
+                    * (BROKER_RESTART > 0 ? 4 : 1);
+
+            if (false && min > creation) {
+                SimpleDateFormat df = new SimpleDateFormat("HH:mm:ss.SSS");
+                exit("" + this + ".checkDeliveryTime failed. Message time: "
+                        + df.format(new Date(creation)) + ", min: "
+                        + df.format(new Date(min)) + "\r\n" + message);
+            }
+        }
+
+        private Connection openConnection() throws JMSException {
+            Connection con = cf.createConnection();
+            con.setClientID(conClientId);
+            ((ActiveMQConnection) con).setCloseTimeout(60000);
+            con.start();
+            return con;
+        }
+
+        private void subscribe() throws JMSException {
+            processLock.readLock().lock();
+            try {
+                Connection con = openConnection();
+                Session session = con
+                        .createSession(false, Session.AUTO_ACKNOWLEDGE);
+                session.createDurableSubscriber(topic, SUBSCRIPTION_NAME, selector,
+                        true);
+                session.close();
+                con.close();
+            }
+            finally {
+                processLock.readLock().unlock();
+            }
+        }
+
+        private void unsubscribe() throws JMSException {
+            processLock.readLock().lock();
+            LOG.info("Unsubscribe: " + this);
+            try {
+                Connection con = openConnection();
+                Session session = con
+                        .createSession(false, Session.AUTO_ACKNOWLEDGE);
+                session.unsubscribe(SUBSCRIPTION_NAME);
+                session.close();
+                con.close();
+            }
+            finally {
+                processLock.readLock().unlock();
+            }
+        }
+
+        @Override
+        public String toString() {
+            return "Client[id=" + id + ", type=" + clientType + "] consumerId=" + (consumer != null ? consumer.getConsumerId() : "null");
+        }
+    }
+
+    /**
+     * Sweeps out not-used durable subscriptions.
+     */
+    private final class HouseKeeper extends Thread {
+
+        private HouseKeeper() {
+            super("HouseKeeper");
+            setDaemon(true);
+        }
+
+        public final CopyOnWriteArrayList<String> abandonedSubscriptions = new CopyOnWriteArrayList<String>();
+
+        @Override
+        public void run() {
+            while (true) {
+                try {
+                    Thread.sleep(3 * 60 * 1000);
+
+                    processLock.readLock().lock();
+                    try {
+                        sweep();
+                    } finally {
+                        processLock.readLock().unlock();
+                    }
+                } catch (InterruptedException ex) {
+                    break;
+                } catch (Throwable e) {
+                    Exception log = new Exception("HouseKeeper failed.", e);
+                    log.printStackTrace();
+                }
+            }
+        }
+
+        private void sweep() throws Exception {
+            LOG.info("Housekeeper sweeping.");
+
+            int closed = 0;
+            ArrayList<String> sweeped = new ArrayList<String>();
+            try {
+                for (String clientId : abandonedSubscriptions) {
+                    LOG.info("Sweeping out subscription of "
+                            + clientId + ".");
+                    broker.getAdminView().destroyDurableSubscriber(clientId,
+                            Client.SUBSCRIPTION_NAME);
+                    sweeped.add(clientId);
+                    closed++;
+                }
+            } catch (Exception ignored) {
+                LOG.info("Ex on destroy sub " + ignored);
+            } finally {
+                abandonedSubscriptions.removeAll(sweeped);
+            }
+
+            LOG.info("Housekeeper sweeped out " + closed
+                    + " subscriptions.");
+        }
+    }
+
+    public static int random(int max) {
+        return (int) (Math.random() * (max + 1));
+    }
+
+    public static int random(int min, int max) {
+        return random(max - min) + min;
+    }
+
+    public static void sleepRandom(int maxMillis) throws InterruptedException {
+        Thread.sleep(random(maxMillis));
+    }
+
+    public static void sleepRandom(int minMillis, int maxMillis)
+            throws InterruptedException {
+        Thread.sleep(random(minMillis, maxMillis));
+    }
+
+    public static final class Random {
+
+        final int min;
+        final int max;
+
+        Random(int min, int max) {
+            this.min = min;
+            this.max = max;
+        }
+
+        public int next() {
+            return random(min, max);
+        }
+
+        public void sleepRandom() throws InterruptedException {
+            DurableSubProcessConcurrentCommitActivateNoDuplicateTest.sleepRandom(min, max);
+        }
+    }
+
+    public static void exit(String message) {
+        exit(message, null);
+    }
+
+    public static void exit(String message, Throwable e) {
+        Throwable cause = new RuntimeException(message, e);
+        LOG.error(message, cause);
+        exceptions.add(cause);
+        ThreadTracker.result();
+        //fail(cause.toString());
+        System.exit(-9);
+    }
+
+    @Before
+    public void setUp() throws Exception {
+        topic = new ActiveMQTopic("TopicT");
+        startBroker();
+
+        clientManager = new ClientManager();
+        server = new Server();
+        houseKeeper = new HouseKeeper();
+
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        destroyBroker();
+    }
+
+    private enum Persistence {
+        MEMORY, AMQ, KAHA, KAHADB
+    }
+
+    private void startBroker() throws Exception {
+        startBroker(true);
+    }
+
+    private void startBroker(boolean deleteAllMessages) throws Exception {
+        if (broker != null)
+            return;
+
+        broker = BrokerFactory.createBroker("broker:(vm://" + getName() + ")");
+        broker.setBrokerName(getName());
+        broker.setAdvisorySupport(false);
+        broker.setDeleteAllMessagesOnStartup(deleteAllMessages);
+
+        switch (PERSISTENT_ADAPTER) {
+        case MEMORY:
+            broker.setPersistent(false);
+            break;
+
+        case AMQ:
+            File amqData = new File("activemq-data/" + getName() + "-amq");
+            if (deleteAllMessages)
+                delete(amqData);
+
+            broker.setPersistent(true);
+            AMQPersistenceAdapter amq = new AMQPersistenceAdapter();
+            amq.setDirectory(amqData);
+            broker.setPersistenceAdapter(amq);
+            break;
+
+        case KAHA:
+            File kahaData = new File("activemq-data/" + getName() + "-kaha");
+            if (deleteAllMessages)
+                delete(kahaData);
+
+            broker.setPersistent(true);
+            KahaPersistenceAdapter kaha = new KahaPersistenceAdapter();
+            kaha.setDirectory(kahaData);
+            broker.setPersistenceAdapter(kaha);
+            break;
+
+        case KAHADB:
+            File kahadbData = new File("activemq-data/" + getName() + "-kahadb");
+            if (deleteAllMessages)
+                delete(kahadbData);
+
+            broker.setPersistent(true);
+            KahaDBPersistenceAdapter kahadb = new KahaDBPersistenceAdapter();
+            kahadb.setDirectory(kahadbData);
+            kahadb.setJournalMaxFileLength(5 * 1024 * 1024);
+            broker.setPersistenceAdapter(kahadb);
+            break;
+        }
+
+        broker.addConnector("tcp://localhost:61656");
+
+        broker.getSystemUsage().getMemoryUsage().setLimit(256 * 1024 * 1024);
+        broker.getSystemUsage().getTempUsage().setLimit(256 * 1024 * 1024);
+        broker.getSystemUsage().getStoreUsage().setLimit(1024 * 1024 * 1024);
+
+
+        PolicyMap policyMap = new PolicyMap();
+        PolicyEntry defaultEntry = new PolicyEntry();
+        defaultEntry.setMaxAuditDepth(20000);
+        policyMap.setDefaultEntry(defaultEntry);
+        broker.setDestinationPolicy(policyMap);
+        broker.start();
+    }
+
+    protected static String getName() {
+        return "DurableSubProcessWithRestartTest";
+    }
+
+    private static boolean delete(File path) {
+        if (path == null)
+            return true;
+
+        if (path.isDirectory()) {
+            for (File file : path.listFiles()) {
+                delete(file);
+            }
+        }
+        return path.delete();
+    }
+
+    private void destroyBroker() throws Exception {
+        if (broker == null)
+            return;
+
+        broker.stop();
+        broker = null;
+    }
+}

activemq-core/src/test/java/org/apache/activemq/usecases/DurableSubscriberWithNetworkDisconnectTest.java

@@ -214,7 +214,7 @@ public class DurableSubscriberWithNetworkDisconnectTest extends JmsMultipleBroke
             }
 
              if (failover) {
-                options += "?maxReconnectAttempts=1)";
+                options += "?maxReconnectAttempts=0)";
              }
 
             options += "?useExponentialBackOff=" + exponentialBackOff;

activemq-core/src/test/java/org/apache/activemq/usecases/DurableSubscriptionOfflineTest.java

@@ -16,7 +16,12 @@
  */
 package org.apache.activemq.usecases;
 
+import java.util.Random;
+import java.util.HashSet;
 import java.util.Vector;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
 import javax.jms.Connection;
 import javax.jms.JMSException;
 import javax.jms.Message;
@@ -33,9 +38,8 @@ import org.apache.activemq.broker.jmx.DurableSubscriptionViewMBean;
 import org.apache.activemq.broker.jmx.TopicViewMBean;
 import org.apache.activemq.broker.region.policy.PolicyEntry;
 import org.apache.activemq.broker.region.policy.PolicyMap;
-import org.apache.activemq.command.ActiveMQDestination;
-import org.apache.activemq.command.ActiveMQQueue;
 import org.apache.activemq.command.ActiveMQTopic;
+import org.apache.activemq.command.MessageId;
 import org.apache.activemq.store.jdbc.JDBCPersistenceAdapter;
 import org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter;
 import org.apache.activemq.util.Wait;
@@ -51,7 +55,7 @@ public class DurableSubscriptionOfflineTest extends org.apache.activemq.TestSupp
     public boolean keepDurableSubsActive = true;
     private BrokerService broker;
     private ActiveMQTopic topic;
-    private Vector<Exception> exceptions = new Vector<Exception>();
+    private Vector<Throwable> exceptions = new Vector<Throwable>();
 
     protected ActiveMQConnectionFactory createConnectionFactory() throws Exception {
         ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("vm://" + getName(true));
@@ -962,6 +966,95 @@ public class DurableSubscriptionOfflineTest extends org.apache.activemq.TestSupp
         assertEquals("offline consumer got all", sent, listener.count);
     }
 
+    public void testNoDuplicateOnConcurrentSendTranCommitAndActivate() throws Exception {
+        final int messageCount = 1000;
+        Connection con = null;
+        Session session = null;
+        final int numConsumers = 10;
+        for (int i = 0; i <= numConsumers; i++) {
+            con = createConnection("cli" + i);
+            session = con.createSession(false, Session.AUTO_ACKNOWLEDGE);
+            session.createDurableSubscriber(topic, "SubsId", null, true);
+            session.close();
+            con.close();
+        }
+
+        class CheckForDupsClient implements Runnable {
+            HashSet<Long> ids = new HashSet<Long>();
+            final int id;
+
+            public CheckForDupsClient(int id) {
+                this.id = id;
+            }
+
+            @Override
+            public void run() {
+                try {
+                    Connection con = createConnection("cli" + id);
+                    Session session = con.createSession(false, Session.AUTO_ACKNOWLEDGE);
+                    for (int j=0;j<2;j++) {
+                        MessageConsumer consumer = session.createDurableSubscriber(topic, "SubsId", null, true);
+                        for (int i = 0; i < messageCount/2; i++) {
+                            Message message = consumer.receive(4000);
+                            assertNotNull(message);
+                            long producerSequenceId = new MessageId(message.getJMSMessageID()).getProducerSequenceId();
+                            assertTrue("ID=" + id + " not a duplicate: " + producerSequenceId, ids.add(producerSequenceId));
+                        }
+                        consumer.close();
+                    }
+
+                    // verify no duplicates left
+                    MessageConsumer consumer = session.createDurableSubscriber(topic, "SubsId", null, true);
+                    Message message = consumer.receive(4000);
+                    if (message != null) {
+                        long producerSequenceId = new MessageId(message.getJMSMessageID()).getProducerSequenceId();
+                        assertTrue("ID=" + id + " not a duplicate: " + producerSequenceId, ids.add(producerSequenceId));
+                    }
+                    assertNull(message);
+
+
+                    session.close();
+                    con.close();
+                } catch (Throwable e) {
+                    e.printStackTrace();
+                    exceptions.add(e);
+                }
+            }
+        }
+
+
+        final String payLoad = new String(new byte[1000]);
+        con = createConnection();
+        final Session sendSession = con.createSession(true, Session.SESSION_TRANSACTED);
+        MessageProducer producer = sendSession.createProducer(topic);
+        for (int i = 0; i < messageCount; i++) {
+            producer.send(sendSession.createTextMessage(payLoad));
+        }
+
+        ExecutorService executorService = Executors.newCachedThreadPool();
+
+        // concurrent commit and activate
+        executorService.execute(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    sendSession.commit();
+                } catch (JMSException e) {
+                    e.printStackTrace();
+                    exceptions.add(e);
+                }
+            }
+        });
+        for (int i = 0; i < numConsumers; i++) {
+            executorService.execute(new CheckForDupsClient(i));
+        }
+
+        executorService.shutdown();
+        executorService.awaitTermination(5, TimeUnit.MINUTES);
+        con.close();
+
+        assertTrue("no exceptions: " + exceptions, exceptions.isEmpty());
+    }
 
     public void testUnmatchedSubUnsubscribeDeletesAll() throws Exception {
         // create offline subs 1
@@ -1292,6 +1385,120 @@ public class DurableSubscriptionOfflineTest extends org.apache.activemq.TestSupp
         }
     }
 
+
+    public void testRedeliveryFlag() throws Exception {
+
+        Connection con;
+        Session session;
+        final int numClients = 2;
+        for (int i=0; i<numClients; i++) {
+            con = createConnection("cliId" + i);
+            session = con.createSession(false, Session.CLIENT_ACKNOWLEDGE);
+            session.createDurableSubscriber(topic, "SubsId", "filter = 'true'", true);
+            session.close();
+            con.close();
+        }
+
+        final Random random = new Random();
+
+        // send messages
+        con = createConnection();
+        session = con.createSession(false, Session.AUTO_ACKNOWLEDGE);
+        MessageProducer producer = session.createProducer(null);
+
+        final int count = 1000;
+        for (int i = 0; i < count; i++) {
+            Message message = session.createMessage();
+            message.setStringProperty("filter", "true");
+            producer.send(topic, message);
+        }
+        session.close();
+        con.close();
+
+        class Client implements Runnable {
+            Connection con;
+            Session session;
+            String clientId;
+            Client(String id) {
+                this.clientId = id;
+            }
+
+            @Override
+            public void run() {
+                MessageConsumer consumer = null;
+                Message message = null;
+
+                try {
+                    for (int i = -1; i < random.nextInt(10); i++) {
+                        // go online and take none
+                        con = createConnection(clientId);
+                        session = con.createSession(false, Session.CLIENT_ACKNOWLEDGE);
+                        consumer = session.createDurableSubscriber(topic, "SubsId", "filter = 'true'", true);
+                        session.close();
+                        con.close();
+                    }
+
+                    // consume 1
+                    con = createConnection(clientId);
+                    session = con.createSession(false, Session.CLIENT_ACKNOWLEDGE);
+                    consumer = session.createDurableSubscriber(topic, "SubsId", "filter = 'true'", true);
+                    message = consumer.receive(4000);
+                    assertNotNull("got message", message);
+                    // it is not reliable as it depends on broker dispatch rather than client receipt
+                    // and delivered ack
+                    //  assertFalse("not redelivered", message.getJMSRedelivered());
+                    message.acknowledge();
+                    session.close();
+                    con.close();
+
+                    // peek all
+                    for (int j = 0; j < random.nextInt(10); j++) {
+                        con = createConnection(clientId);
+                        session = con.createSession(false, Session.CLIENT_ACKNOWLEDGE);
+                        consumer = session.createDurableSubscriber(topic, "SubsId", "filter = 'true'", true);
+
+                        for (int i = 0; i < count - 1; i++) {
+                            assertNotNull("got message", consumer.receive(4000));
+                        }
+                        // no ack
+                        session.close();
+                        con.close();
+                    }
+
+
+                    // consume remaining
+                    con = createConnection(clientId);
+                    session = con.createSession(false, Session.CLIENT_ACKNOWLEDGE);
+                    consumer = session.createDurableSubscriber(topic, "SubsId", "filter = 'true'", true);
+
+                    for (int i = 0; i < count - 1; i++) {
+                        message = consumer.receive(4000);
+                        assertNotNull("got message", message);
+                        assertTrue("is redelivered", message.getJMSRedelivered());
+                    }
+                    message.acknowledge();
+                    session.close();
+                    con.close();
+
+                    con = createConnection(clientId);
+                    session = con.createSession(false, Session.CLIENT_ACKNOWLEDGE);
+                    consumer = session.createDurableSubscriber(topic, "SubsId", "filter = 'true'", true);
+                    assertNull("no message left", consumer.receive(2000));
+                } catch (Throwable throwable) {
+                    throwable.printStackTrace();
+                    exceptions.add(throwable);
+                }
+            }
+        }
+        ExecutorService executorService = Executors.newCachedThreadPool();
+        for (int i=0; i<numClients; i++) {
+            executorService.execute(new Client("cliId" + i));
+        }
+        executorService.shutdown();
+        executorService.awaitTermination(10, TimeUnit.MINUTES);
+        assertTrue("No exceptions", exceptions.isEmpty());
+    }
+
     public static class Listener implements MessageListener {
         int count = 0;
         String id = null;

kahadb/src/test/java/org/apache/kahadb/index/BTreeIndexTest.java

@@ -32,12 +32,15 @@ import java.util.Map;
 import java.util.Random;
 
 import org.apache.kahadb.page.PageFile;
+import org.apache.kahadb.page.Transaction;
 import org.apache.kahadb.util.LongMarshaller;
 import org.apache.kahadb.util.StringMarshaller;
 import org.apache.kahadb.util.VariableMarshaller;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class BTreeIndexTest extends IndexTestSupport {
-
+    private static final Logger LOG = LoggerFactory.getLogger(BTreeIndexTest.class);
     private NumberFormat nf;
 
     @Override
@@ -127,7 +130,7 @@ public class BTreeIndexTest extends IndexTestSupport {
     }
 
     public void testIteration() throws Exception {
-        createPageFileAndIndex(100);
+        createPageFileAndIndex(500);
         BTreeIndex<String,Long> index = ((BTreeIndex<String,Long>)this.index);
         this.index.load(tx);
         tx.commit();
@@ -140,6 +143,8 @@ public class BTreeIndexTest extends IndexTestSupport {
         this.index.load(tx);
         tx.commit();
 
+        exerciseAnotherIndex(tx);
+
         // BTree should iterate it in sorted order.
         int counter=0;
         for (Iterator<Map.Entry<String,Long>> i = index.iterator(tx); i.hasNext();) {
@@ -189,18 +194,77 @@ public class BTreeIndexTest extends IndexTestSupport {
         createPageFileAndIndex(100);
         BTreeIndex<String,Long> index = ((BTreeIndex<String,Long>)this.index);
         this.index.load(tx);
+
+        long id = tx.allocate().getPageId();
         tx.commit();
 
-        final int count = 4000;
+        BTreeIndex<String, String> sindex = new BTreeIndex<String,String>(pf, id);
-        doInsert(count);
+        sindex.setKeyMarshaller(StringMarshaller.INSTANCE);
+        sindex.setValueMarshaller(StringMarshaller.INSTANCE);
+        sindex.load(tx);
+
+        tx.commit();
+
+        final int count = 5000;
+
+        String payload = new String(new byte[2]);
+        for (int i = 0; i < count; i++) {
+            index.put(tx, key(i), (long)i);
+            sindex.put(tx, key(i), String.valueOf(i) + payload);
+            tx.commit();
+        }
+
 
         Random rand = new Random(System.currentTimeMillis());
         int i = 0, prev = 0;
-        while (!index.isEmpty(tx)) {
+        while (!index.isEmpty(tx) || !sindex.isEmpty(tx)) {
             prev = i;
             i = rand.nextInt(count);
             try {
                 index.remove(tx, key(i));
+                sindex.remove(tx, key(i));
+            } catch (Exception e) {
+                e.printStackTrace();
+                fail("unexpected exception on " + i + ", prev: " + prev + ", ex: " + e);
+            }
+        }
+    }
+
+    public void testRandomAddRemove() throws Exception {
+
+        createPageFileAndIndex(1024);
+        BTreeIndex<String,Long> index = ((BTreeIndex<String,Long>)this.index);
+        this.index.load(tx);
+
+        long id = tx.allocate().getPageId();
+        tx.commit();
+
+        BTreeIndex<String, String> sindex = new BTreeIndex<String,String>(pf, id);
+        sindex.setKeyMarshaller(StringMarshaller.INSTANCE);
+        sindex.setValueMarshaller(StringMarshaller.INSTANCE);
+        sindex.load(tx);
+
+        tx.commit();
+
+        Random rand = new Random(System.currentTimeMillis());
+        final int count = 50000;
+
+        String payload = new String(new byte[200]);
+        for (int i = 0; i < count; i++) {
+            int insertIndex = rand.nextInt(count);
+            index.put(tx, key(insertIndex), (long)insertIndex);
+            sindex.put(tx, key(insertIndex), String.valueOf(insertIndex) + payload);
+            tx.commit();
+        }
+
+
+        int i = 0, prev = 0;
+        while (!index.isEmpty(tx) || !sindex.isEmpty(tx)) {
+            prev = i;
+            i = rand.nextInt(count);
+            try {
+                index.remove(tx, key(i));
+                sindex.remove(tx, key(i));
             } catch (Exception e) {
                 e.printStackTrace();
                 fail("unexpected exception on " + i + ", prev: " + prev + ", ex: " + e);
@@ -219,13 +283,46 @@ public class BTreeIndexTest extends IndexTestSupport {
 
         index.remove(tx, key(3697));
         index.remove(tx, key(1566));
+
+        tx.commit();
+        index.clear(tx);
+        tx.commit();
+
+        doInsert(count);
+
+        Iterator<Map.Entry<String, Long>> iterator = index.iterator(tx, key(1345));
+        while (iterator.hasNext()) {
+            Map.Entry<String, Long> val = iterator.next();
+        }
+
+        doRemoveBackwards(666);
+        Map.Entry<String, Long> first = index.getFirst(tx);
+        assertEquals(first.getValue(), Long.valueOf(666L));
+
+        for (int i=0; i<2000; i++) {
+            Map.Entry<String, Long> last = index.getLast(tx);
+            index.remove(tx, last.getKey());
+            tx.commit();
+        }
+
+        exerciseAnotherIndex(tx);
+
+        iterator = index.iterator(tx, key(100));
+        while (iterator.hasNext()) {
+            Map.Entry<String, Long> val = iterator.next();
+        }
+
+        Map.Entry<String, Long> last = index.getLast(tx);
+        assertEquals(last.getValue(), Long.valueOf(1999L));
+        index.clear(tx);
+        assertNull(index.getLast(tx));
     }
 
     public void testLargeValue() throws Exception {
         //System.setProperty("maxKahaDBTxSize", "" + (1024*1024*1024));
         pf = new PageFile(directory, getClass().getName());
         pf.setPageSize(4*1024);
-        pf.setEnablePageCaching(false);
+        //pf.setEnablePageCaching(false);
         pf.load();
         tx = pf.tx();
         long id = tx.allocate().getPageId();
@@ -262,6 +359,7 @@ public class BTreeIndexTest extends IndexTestSupport {
         tx.commit();
         tx =  pf.tx();
         for (long i=0; i<numMessages; i++) {
+            assertTrue(test.containsKey(tx, i));
             test.get(tx, i);
         }
         tx.commit();
@@ -270,7 +368,6 @@ public class BTreeIndexTest extends IndexTestSupport {
     public void testLargeValueOverflow() throws Exception {
         pf = new PageFile(directory, getClass().getName());
         pf.setPageSize(4*1024);
-        pf.setEnablePageCaching(false);
         pf.setWriteBatchSize(1);
         pf.load();
         tx = pf.tx();
@@ -292,14 +389,106 @@ public class BTreeIndexTest extends IndexTestSupport {
         }
         tx.commit();
 
+        exerciseAnotherIndex(tx);
+
         tx =  pf.tx();
         for (long i=0; i<numMessages; i++) {
+            assertTrue(test.containsKey(tx, i));
             String s = test.get(tx, i);
             assertEquals("len is as expected", stringSize, s.length());
         }
         tx.commit();
     }
 
+    public void exerciseAnotherIndex(Transaction tx) throws Exception {
+        long id = tx.allocate().getPageId();
+
+        ListIndex<String, String> test = new ListIndex<String, String>(pf, id);
+        test.setKeyMarshaller(StringMarshaller.INSTANCE);
+        test.setValueMarshaller(StringMarshaller.INSTANCE);
+        test.load(tx);
+        tx.commit();
+
+        final int count = 10000;
+
+        String payload = new String(new byte[1]);
+        for (int i = 0; i < count; i++) {
+            test.put(tx, key(i), String.valueOf(i) + payload);
+        }
+        tx.commit();
+
+        test.clear(tx);
+        tx.commit();
+    }
+
+    public void testListIndexConsistancyOverTime() throws Exception {
+
+        final int NUM_ITERATIONS = 50;
+
+        pf = new PageFile(directory, getClass().getName());
+        pf.setPageSize(4*1024);
+        //pf.setEnablePageCaching(false);
+        pf.setWriteBatchSize(1);
+        pf.load();
+        tx = pf.tx();
+        long id = tx.allocate().getPageId();
+
+        ListIndex<String, String> test = new ListIndex<String, String>(pf, id);
+        test.setKeyMarshaller(StringMarshaller.INSTANCE);
+        test.setValueMarshaller(StringMarshaller.INSTANCE);
+        test.load(tx);
+        tx.commit();
+
+        int expectedListEntries = 0;
+        int nextSequenceId = 0;
+
+        LOG.info("Loading up the ListIndex with "+NUM_ITERATIONS+" entires and sparsely populating the sequences.");
+
+        for (int i = 0; i < NUM_ITERATIONS; ++i) {
+            test.add(tx, String.valueOf(expectedListEntries++), new String("AA"));
+
+            for (int j = 0; j < expectedListEntries; j++) {
+
+                String sequenceSet = test.get(tx, String.valueOf(j));
+
+                int startSequenceId = nextSequenceId;
+                for (int ix = 0; ix < NUM_ITERATIONS; ix++) {
+                    sequenceSet.concat(String.valueOf(nextSequenceId++));
+                    test.put(tx, String.valueOf(j), sequenceSet);
+                }
+
+                sequenceSet = test.get(tx, String.valueOf(j));
+
+                for (int ix = 0; ix < NUM_ITERATIONS - 1; ix++) {
+                    //sequenceSet.remove(startSequenceId++);
+                    test.put(tx, String.valueOf(j), String.valueOf(j));
+                }
+            }
+        }
+
+        exerciseAnotherIndex(tx);
+        LOG.info("Checking if Index has the expected number of entries.");
+
+        for (int i = 0; i < NUM_ITERATIONS; ++i) {
+            assertTrue("List should contain Key["+i+"]",test.containsKey(tx, String.valueOf(i)));
+            assertNotNull("List contents of Key["+i+"] should not be null", test.get(tx, String.valueOf(i)));
+        }
+
+        LOG.info("Index has the expected number of entries.");
+
+        assertEquals(expectedListEntries, test.size());
+
+        for (int i = 0; i < NUM_ITERATIONS; ++i) {
+            LOG.debug("Size of ListIndex before removal of entry ["+i+"] is: " + test.size());
+
+            assertTrue("List should contain Key["+i+"]",test.containsKey(tx, String.valueOf(i)));
+            assertNotNull("List contents of Key["+i+"] should not be null", test.remove(tx, String.valueOf(i)));
+            LOG.debug("Size of ListIndex after removal of entry ["+i+"] is: " + test.size());
+
+            assertEquals(expectedListEntries - (i + 1), test.size());
+        }
+    }
+
     void doInsertReverse(int count) throws Exception {
         for (int i = count-1; i >= 0; i--) {
             index.put(tx, key(i), (long)i);