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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 

git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@1391661 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Gary Tully 2012-09-28 21:13:59 +00:00
parent 591c1a549c
commit 0a7c5dc93a
3 changed files with 301 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
activemq-core/src/main/java/org/apache/activemq/broker/region/Queue.java
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@ -210,11 +210,19 @@ public class Queue extends BaseDestination implements Task, UsageListener {
private final FlowControlTimeoutTask flowControlTimeoutTask = new FlowControlTimeoutTask(); 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) { public int compare(Subscription s1, Subscription s2) {
// We want the list sorted in descending order // 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 BaseDestination implements Task, UsageListener {
String groupId = node.getGroupID(); String groupId = node.getGroupID();
int sequence = node.getGroupSequence(); int sequence = node.getGroupSequence();
if (groupId != null) { if (groupId != null) {
//MessageGroupMap messageGroupOwners = ((Queue) node
// .getRegionDestination()).getMessageGroupOwners();
MessageGroupMap messageGroupOwners = getMessageGroupOwners(); MessageGroupMap messageGroupOwners = getMessageGroupOwners();
// If we can own the first, then no-one else should own the // If we can own the first, then no-one else should own the
@ -1956,6 +1962,7 @@ public class Queue extends BaseDestination implements Task, UsageListener {
// A group sequence < 1 is an end of group signal. // A group sequence < 1 is an end of group signal.
if (sequence < 0) { if (sequence < 0) {
messageGroupOwners.removeGroup(groupId); messageGroupOwners.removeGroup(groupId);
subscription.getConsumerInfo().setLastDeliveredSequenceId(subscription.getConsumerInfo().getLastDeliveredSequenceId() - 1);
} }
} else { } else {
result = false; result = false;
@ -1979,6 +1986,7 @@ public class Queue extends BaseDestination implements Task, UsageListener {
LOG.warn("Failed to set boolean header: " + e, e); LOG.warn("Failed to set boolean header: " + e, e);
} }
} }
subs.getConsumerInfo().setLastDeliveredSequenceId(subs.getConsumerInfo().getLastDeliveredSequenceId() + 1);
} }
protected void pageInMessages(boolean force) throws Exception { protected void pageInMessages(boolean force) throws Exception {

1
activemq-core/src/main/java/org/apache/activemq/command/ConsumerInfo.java
View File

@ -61,6 +61,7 @@ public class ConsumerInfo extends BaseCommand {
// not marshalled, populated from RemoveInfo, the last message delivered, used // not marshalled, populated from RemoveInfo, the last message delivered, used
// to suppress redelivery on prefetched messages after close // to suppress redelivery on prefetched messages after close
// overload; also used at runtime to track assignment of message groups
private transient long lastDeliveredSequenceId; private transient long lastDeliveredSequenceId;
// originated from a // originated from a

288
activemq-core/src/test/java/org/apache/activemq/usecases/MessageGroupLateArrivalsTest.java Normal file
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@ -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();
}
}
}
}