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From gtu...@apache.org
Subject svn commit: r1391661 - in /activemq/trunk/activemq-core/src: main/java/org/apache/activemq/broker/region/Queue.java main/java/org/apache/activemq/command/ConsumerInfo.java test/java/org/apache/activemq/usecases/MessageGroupLateArrivalsTest.java
Date Fri, 28 Sep 2012 21:14:00 GMT
Author: gtully
Date: Fri Sep 28 21:13:59 2012
New Revision: 1391661

URL: http://svn.apache.org/viewvc?rev=1391661&view=rev
Log:
https://issues.apache.org/jira/browse/AMQ-2106 - Allow broker to evenly distribute message
groups among consumers - have consumer order take number of assigned groups into account,
such that priority is given to the least loaded consumers. When groups change frequently or
are suspended this allows better distribution. When new consumer arrive they now have a good
chance of getting the next available groups

Added:
    activemq/trunk/activemq-core/src/test/java/org/apache/activemq/usecases/MessageGroupLateArrivalsTest.java
  (with props)
Modified:
    activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/Queue.java
    activemq/trunk/activemq-core/src/main/java/org/apache/activemq/command/ConsumerInfo.java

Modified: activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/Queue.java
URL: http://svn.apache.org/viewvc/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/Queue.java?rev=1391661&r1=1391660&r2=1391661&view=diff
==============================================================================
--- activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/Queue.java
(original)
+++ activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/region/Queue.java
Fri Sep 28 21:13:59 2012
@@ -210,11 +210,19 @@ public class Queue extends BaseDestinati
 
     private final FlowControlTimeoutTask flowControlTimeoutTask = new FlowControlTimeoutTask();
 
-    private static final Comparator<Subscription> orderedCompare = new Comparator<Subscription>()
{
+    private final Comparator<Subscription> orderedCompare = new Comparator<Subscription>()
{
 
         public int compare(Subscription s1, Subscription s2) {
             // We want the list sorted in descending order
-            return s2.getConsumerInfo().getPriority() - s1.getConsumerInfo().getPriority();
+            int val = s2.getConsumerInfo().getPriority() - s1.getConsumerInfo().getPriority();
+            if (val == 0 && messageGroupOwners != null) {
+                // then ascending order of assigned message groups to favour less loaded
consumers
+                // Long.compare in jdk7
+                long x = s1.getConsumerInfo().getLastDeliveredSequenceId();
+                long y = s2.getConsumerInfo().getLastDeliveredSequenceId();
+                val = (x < y) ? -1 : ((x == y) ? 0 : 1);
+            }
+            return val;
         }
     };
 
@@ -1934,8 +1942,6 @@ public class Queue extends BaseDestinati
         String groupId = node.getGroupID();
         int sequence = node.getGroupSequence();
         if (groupId != null) {
-            //MessageGroupMap messageGroupOwners = ((Queue) node
-            //        .getRegionDestination()).getMessageGroupOwners();
 
             MessageGroupMap messageGroupOwners = getMessageGroupOwners();
             // If we can own the first, then no-one else should own the
@@ -1956,6 +1962,7 @@ public class Queue extends BaseDestinati
                         // A group sequence < 1 is an end of group signal.
                         if (sequence < 0) {
                             messageGroupOwners.removeGroup(groupId);
+                            subscription.getConsumerInfo().setLastDeliveredSequenceId(subscription.getConsumerInfo().getLastDeliveredSequenceId()
- 1);
                         }
                     } else {
                         result = false;
@@ -1979,6 +1986,7 @@ public class Queue extends BaseDestinati
                 LOG.warn("Failed to set boolean header: " + e, e);
             }
         }
+        subs.getConsumerInfo().setLastDeliveredSequenceId(subs.getConsumerInfo().getLastDeliveredSequenceId()
+ 1);
     }
 
     protected void pageInMessages(boolean force) throws Exception {

Modified: activemq/trunk/activemq-core/src/main/java/org/apache/activemq/command/ConsumerInfo.java
URL: http://svn.apache.org/viewvc/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/command/ConsumerInfo.java?rev=1391661&r1=1391660&r2=1391661&view=diff
==============================================================================
--- activemq/trunk/activemq-core/src/main/java/org/apache/activemq/command/ConsumerInfo.java
(original)
+++ activemq/trunk/activemq-core/src/main/java/org/apache/activemq/command/ConsumerInfo.java
Fri Sep 28 21:13:59 2012
@@ -61,6 +61,7 @@ public class ConsumerInfo extends BaseCo
 
     // not marshalled, populated from RemoveInfo, the last message delivered, used
     // to suppress redelivery on prefetched messages after close
+    // overload; also used at runtime to track assignment of message groups
     private transient long lastDeliveredSequenceId;
 
     // originated from a

Added: activemq/trunk/activemq-core/src/test/java/org/apache/activemq/usecases/MessageGroupLateArrivalsTest.java
URL: http://svn.apache.org/viewvc/activemq/trunk/activemq-core/src/test/java/org/apache/activemq/usecases/MessageGroupLateArrivalsTest.java?rev=1391661&view=auto
==============================================================================
--- activemq/trunk/activemq-core/src/test/java/org/apache/activemq/usecases/MessageGroupLateArrivalsTest.java
(added)
+++ activemq/trunk/activemq-core/src/test/java/org/apache/activemq/usecases/MessageGroupLateArrivalsTest.java
Fri Sep 28 21:13:59 2012
@@ -0,0 +1,288 @@
+/**
+ * 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.usecases;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Set;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+import javax.jms.Connection;
+import javax.jms.Destination;
+import javax.jms.Message;
+import javax.jms.MessageConsumer;
+import javax.jms.MessageProducer;
+import javax.jms.Session;
+import junit.framework.Test;
+import org.apache.activemq.ActiveMQConnectionFactory;
+import org.apache.activemq.JmsTestSupport;
+import org.apache.activemq.broker.BrokerService;
+import org.apache.activemq.broker.TransportConnector;
+import org.apache.activemq.broker.region.policy.PolicyEntry;
+import org.apache.activemq.broker.region.policy.PolicyMap;
+import org.apache.activemq.command.ActiveMQQueue;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+
+public class MessageGroupLateArrivalsTest extends JmsTestSupport {
+    public static final Logger log = LoggerFactory.getLogger(MessageGroupLateArrivalsTest.class);
+    protected Connection connection;
+    protected Session session;
+    protected MessageProducer producer;
+    protected Destination destination;
+
+    BrokerService broker;
+    protected TransportConnector connector;
+
+    protected HashMap<String, Integer> messageCount = new HashMap<String, Integer>();
+    protected HashMap<String, Set<String>> messageGroups = new HashMap<String,
Set<String>>();
+
+    public static Test suite() {
+        return suite(MessageGroupLateArrivalsTest.class);
+    }
+
+    public static void main(String[] args) {
+        junit.textui.TestRunner.run(suite());
+    }
+
+    public void setUp() throws Exception {
+        broker = createBroker();
+        broker.start();
+        ActiveMQConnectionFactory connFactory = new ActiveMQConnectionFactory(connector.getConnectUri()
+ "?jms.prefetchPolicy.all=1000");
+        connection = connFactory.createConnection();
+        session = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
+        destination = new ActiveMQQueue("test-queue2");
+        producer = session.createProducer(destination);
+        connection.start();
+    }
+
+    protected BrokerService createBroker() throws Exception {
+        BrokerService service = new BrokerService();
+        service.setPersistent(false);
+        service.setUseJmx(false);
+
+        PolicyMap policyMap = new PolicyMap();
+        PolicyEntry policy = new PolicyEntry();
+        policy.setUseConsumerPriority(true);
+        policyMap.setDefaultEntry(policy);
+        service.setDestinationPolicy(policyMap);
+
+        connector = service.addConnector("tcp://localhost:0");
+        return service;
+    }
+
+    public void tearDown() throws Exception {
+        producer.close();
+        session.close();
+        connection.close();
+        broker.stop();
+    }
+
+    public void testConsumersLateToThePartyGetSomeNewGroups() throws Exception {
+
+        final int perBatch = 3;
+        int[] counters = {perBatch, perBatch, perBatch};
+
+        CountDownLatch startSignal = new CountDownLatch(0);
+        CountDownLatch doneSignal = new CountDownLatch(1);
+
+        messageCount.put("worker1", 0);
+        messageGroups.put("worker1", new HashSet<String>());
+        Worker worker1 = new Worker(connection, destination, "worker1", startSignal, doneSignal,
counters, messageCount, messageGroups);
+        messageCount.put("worker2", 0);
+        messageGroups.put("worker2", new HashSet<String>());
+        Worker worker2 = new Worker(connection, destination, "worker2", startSignal, doneSignal,
counters, messageCount, messageGroups);
+        messageCount.put("worker3", 0);
+        messageGroups.put("worker3", new HashSet<String>());
+        Worker worker3 = new Worker(connection, destination, "worker3", startSignal, doneSignal,
counters, messageCount, messageGroups);
+
+        new Thread(worker1).start();
+        new Thread(worker2).start();
+
+        for (int i = 0; i < perBatch; i++) {
+            Message msga = session.createTextMessage("hello a");
+            msga.setStringProperty("JMSXGroupID", "A");
+            producer.send(msga);
+
+            Message msgb = session.createTextMessage("hello b");
+            msgb.setStringProperty("JMSXGroupID", "B");
+            producer.send(msgb);
+        }
+
+        // ensure this chap, late to the party gets a new group
+        new Thread(worker3).start();
+
+        // wait for presence before new group
+        TimeUnit.SECONDS.sleep(4);
+
+        // ensure worker 3 is not next in line with normal dispatch
+        //Message msga = session.createTextMessage("hello to who ever is next in line");
+        //producer.send(msga);
+
+        for (int i = 0; i < perBatch; i++) {
+            Message msgc = session.createTextMessage("hello c");
+            msgc.setStringProperty("JMSXGroupID", "C");
+            producer.send(msgc);
+        }
+
+        doneSignal.await();
+
+        for (String worker : messageCount.keySet()) {
+            log.info("worker " + worker + " received " + messageCount.get(worker) + " messages
from groups " + messageGroups.get(worker));
+            assertEquals("worker " + worker + " received " + messageCount.get(worker) + "
messages from groups " + messageGroups.get(worker)
+                    , perBatch, messageCount.get(worker).intValue());
+            assertEquals("worker " + worker + " received " + messageCount.get(worker) + "
messages from groups " + messageGroups.get(worker)
+                    , 1, messageGroups.get(worker).size());
+        }
+    }
+
+    public void testConsumerLateToBigPartyGetsNewGroup() throws Exception {
+
+        final int perBatch = 2;
+        int[] counters = {perBatch, perBatch, perBatch};
+
+        CountDownLatch startSignal = new CountDownLatch(0);
+        CountDownLatch doneSignal = new CountDownLatch(1);
+
+        messageCount.put("worker1", 0);
+        messageGroups.put("worker1", new HashSet<String>());
+        Worker worker1 = new Worker(connection, destination, "worker1", startSignal, doneSignal,
counters, messageCount, messageGroups);
+        messageCount.put("worker2", 0);
+        messageGroups.put("worker2", new HashSet<String>());
+        Worker worker2 = new Worker(connection, destination, "worker2", startSignal, doneSignal,
counters, messageCount, messageGroups);
+
+        new Thread(worker1).start();
+
+        for (int i = 0; i < perBatch; i++) {
+            Message msga = session.createTextMessage("hello c");
+            msga.setStringProperty("JMSXGroupID", "A");
+            producer.send(msga);
+
+            Message msgb = session.createTextMessage("hello b");
+            msgb.setStringProperty("JMSXGroupID", "B");
+            producer.send(msgb);
+        }
+
+        // ensure this chap, late to the party gets a new group
+        new Thread(worker2).start();
+
+        // wait for presence before new group
+        TimeUnit.SECONDS.sleep(4);
+
+        for (int i = 0; i < perBatch; i++) {
+            Message msgc = session.createTextMessage("hello a");
+            msgc.setStringProperty("JMSXGroupID", "C");
+            producer.send(msgc);
+        }
+
+        doneSignal.await();
+
+        log.info("worker1  received " + messageCount.get("worker1") + " messages from groups
" + messageGroups.get("worker1"));
+        assertEquals("worker1 received " + messageCount.get("worker1") + " messages from
groups " + messageGroups.get("worker1")
+                , 2 * perBatch, messageCount.get("worker1").intValue());
+        assertEquals("worker1 received " + messageCount.get("worker1") + " messages from
groups " + messageGroups.get("worker1")
+                , 2, messageGroups.get("worker1").size());
+
+        log.info("worker2  received " + messageCount.get("worker2") + " messages from groups
" + messageGroups.get("worker2"));
+        assertEquals("worker2 received " + messageCount.get("worker2") + " messages from
groups " + messageGroups.get("worker2")
+                , 2 * perBatch, messageCount.get("worker1").intValue());
+        assertEquals("worker2 received " + messageCount.get("worker2") + " messages from
groups " + messageGroups.get("worker2")
+                , 1, messageGroups.get("worker2").size());
+    }
+
+    private static final class Worker implements Runnable {
+        private Connection connection = null;
+        private Destination queueName = null;
+        private String workerName = null;
+        private CountDownLatch startSignal = null;
+        private CountDownLatch doneSignal = null;
+        private int[] counters = null;
+        private HashMap<String, Integer> messageCount;
+        private HashMap<String, Set<String>> messageGroups;
+
+
+        private Worker(Connection connection, Destination queueName, String workerName, CountDownLatch
startSignal, CountDownLatch doneSignal, int[] counters, HashMap<String, Integer> messageCount,
HashMap<String, Set<String>> messageGroups) {
+            this.connection = connection;
+            this.queueName = queueName;
+            this.workerName = workerName;
+            this.startSignal = startSignal;
+            this.doneSignal = doneSignal;
+            this.counters = counters;
+            this.messageCount = messageCount;
+            this.messageGroups = messageGroups;
+        }
+
+        private void update(String group) {
+            int msgCount = messageCount.get(workerName);
+            messageCount.put(workerName, msgCount + 1);
+            Set<String> groups = messageGroups.get(workerName);
+            groups.add(group);
+            messageGroups.put(workerName, groups);
+        }
+
+        public void run() {
+
+            try {
+                startSignal.await();
+                log.info(workerName);
+                Session sess = connection.createSession(false, Session.CLIENT_ACKNOWLEDGE);
+                MessageConsumer consumer = sess.createConsumer(queueName);
+
+                while (true) {
+                    if (counters[0] == 0 && counters[1] == 0 && counters[2]
== 0) {
+                        doneSignal.countDown();
+                        log.info(workerName + " done...");
+                        break;
+                    }
+
+                    Message msg = consumer.receive(500);
+                    if (msg == null)
+                        continue;
+
+                    msg.acknowledge();
+
+                    String group = msg.getStringProperty("JMSXGroupID");
+                    boolean first = msg.getBooleanProperty("JMSXGroupFirstForConsumer");
+
+                    if ("A".equals(group)) {
+                        --counters[0];
+                        update(group);
+                        //Thread.sleep(500);
+                    } else if ("B".equals(group)) {
+                        --counters[1];
+                        update(group);
+                        //Thread.sleep(100);
+                    } else if ("C".equals(group)) {
+                        --counters[2];
+                        update(group);
+                        //Thread.sleep(10);
+                    } else {
+                        log.warn(workerName + ", unknown group");
+                    }
+                    if (counters[0] != 0 || counters[1] != 0 || counters[2] != 0) {
+                        msg.acknowledge();
+                    }
+                }
+                consumer.close();
+                sess.close();
+            } catch (Exception e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}

Propchange: activemq/trunk/activemq-core/src/test/java/org/apache/activemq/usecases/MessageGroupLateArrivalsTest.java
------------------------------------------------------------------------------
    svn:eol-style = native

Propchange: activemq/trunk/activemq-core/src/test/java/org/apache/activemq/usecases/MessageGroupLateArrivalsTest.java
------------------------------------------------------------------------------
    svn:keywords = Rev Date



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