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/**
* 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.broker.region.policy;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.activemq.broker.Broker;
import org.apache.activemq.broker.ConnectionContext;
import org.apache.activemq.broker.region.Destination;
import org.apache.activemq.broker.region.Subscription;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Abort slow consumers when they reach the configured threshold of slowness,
*
* default is that a consumer that has not Ack'd a message for 30 seconds is slow.
*
* @org.apache.xbean.XBean
*/
public class AbortSlowAckConsumerStrategy extends AbortSlowConsumerStrategy {
private static final Logger LOG = LoggerFactory.getLogger(AbortSlowAckConsumerStrategy.class);
private final Map destinations = new ConcurrentHashMap();
private long maxTimeSinceLastAck = 30*1000;
private boolean ignoreIdleConsumers = true;
private boolean ignoreNetworkConsumers = true;
public AbortSlowAckConsumerStrategy() {
this.name = "AbortSlowAckConsumerStrategy@" + hashCode();
}
@Override
public void setBrokerService(Broker broker) {
super.setBrokerService(broker);
// Task starts right away since we may not receive any slow consumer events.
if (taskStarted.compareAndSet(false, true)) {
scheduler.executePeriodically(this, getCheckPeriod());
}
}
@Override
public void slowConsumer(ConnectionContext context, Subscription subs) {
// Ignore these events, we just look at time since last Ack.
}
@Override
public void run() {
if (maxTimeSinceLastAck < 0) {
// nothing to do
LOG.info("no limit set, slowConsumer strategy has nothing to do");
return;
}
if (getMaxSlowDuration() > 0) {
// For subscriptions that are already slow we mark them again and check below if
// they've exceeded their configured lifetime.
for (SlowConsumerEntry entry : slowConsumers.values()) {
entry.mark();
}
}
List disposed = new ArrayList();
for (Destination destination : destinations.values()) {
if (destination.isDisposed()) {
disposed.add(destination);
continue;
}
// Not explicitly documented but this returns a stable copy.
List subscribers = destination.getConsumers();
updateSlowConsumersList(subscribers);
}
// Clean up an disposed destinations to save space.
for (Destination destination : disposed) {
destinations.remove(destination.getName());
}
abortAllQualifiedSlowConsumers();
}
private void updateSlowConsumersList(List subscribers) {
for (Subscription subscriber : subscribers) {
if (isIgnoreNetworkSubscriptions() && subscriber.getConsumerInfo().isNetworkSubscription()) {
if (slowConsumers.remove(subscriber) != null) {
LOG.info("network sub: {} is no longer slow", subscriber.getConsumerInfo().getConsumerId());
}
continue;
}
if (isIgnoreIdleConsumers() && subscriber.getDispatchedQueueSize() == 0) {
// Not considered Idle so ensure its cleared from the list
if (slowConsumers.remove(subscriber) != null) {
LOG.info("idle sub: {} is no longer slow", subscriber.getConsumerInfo().getConsumerId());
}
continue;
}
long lastAckTime = subscriber.getTimeOfLastMessageAck();
long timeDelta = System.currentTimeMillis() - lastAckTime;
if (timeDelta > maxTimeSinceLastAck) {
if (!slowConsumers.containsKey(subscriber)) {
LOG.debug("sub: {} is now slow", subscriber.getConsumerInfo().getConsumerId());
SlowConsumerEntry entry = new SlowConsumerEntry(subscriber.getContext());
entry.mark(); // mark consumer on first run
slowConsumers.put(subscriber, entry);
} else if (getMaxSlowCount() > 0) {
slowConsumers.get(subscriber).slow();
}
} else {
if (slowConsumers.remove(subscriber) != null) {
LOG.info("sub: {} is no longer slow", subscriber.getConsumerInfo().getConsumerId());
}
}
}
}
private void abortAllQualifiedSlowConsumers() {
HashMap toAbort = new HashMap();
for (Entry entry : slowConsumers.entrySet()) {
if (getMaxSlowDuration() > 0 && (entry.getValue().markCount * getCheckPeriod() >= getMaxSlowDuration()) ||
getMaxSlowCount() > 0 && entry.getValue().slowCount >= getMaxSlowCount()) {
LOG.trace("Transferring consumer{} to the abort list: {} slow duration = {}, slow count = {}",
new Object[]{ entry.getKey().getConsumerInfo().getConsumerId(),
entry.getValue().markCount * getCheckPeriod(),
entry.getValue().getSlowCount() });
toAbort.put(entry.getKey(), entry.getValue());
slowConsumers.remove(entry.getKey());
} else {
LOG.trace("Not yet time to abort consumer {}: slow duration = {}, slow count = {}", new Object[]{ entry.getKey().getConsumerInfo().getConsumerId(), entry.getValue().markCount * getCheckPeriod(), entry.getValue().slowCount });
}
}
// Now if any subscriptions made it into the aborts list we can kick them.
abortSubscription(toAbort, isAbortConnection());
}
@Override
public void addDestination(Destination destination) {
this.destinations.put(destination.getName(), destination);
}
/**
* Gets the maximum time since last Ack before a subscription is considered to be slow.
*
* @return the maximum time since last Ack before the consumer is considered to be slow.
*/
public long getMaxTimeSinceLastAck() {
return maxTimeSinceLastAck;
}
/**
* Sets the maximum time since last Ack before a subscription is considered to be slow.
*
* @param maxTimeSinceLastAck
* the maximum time since last Ack (mills) before the consumer is considered to be slow.
*/
public void setMaxTimeSinceLastAck(long maxTimeSinceLastAck) {
this.maxTimeSinceLastAck = maxTimeSinceLastAck;
}
/**
* Returns whether the strategy is configured to ignore consumers that are simply idle, i.e
* consumers that have no pending acks (dispatch queue is empty).
*
* @return true if the strategy will ignore idle consumer when looking for slow consumers.
*/
public boolean isIgnoreIdleConsumers() {
return ignoreIdleConsumers;
}
/**
* Sets whether the strategy is configured to ignore consumers that are simply idle, i.e
* consumers that have no pending acks (dispatch queue is empty).
*
* When configured to not ignore idle consumers this strategy acks not only on consumers
* that are actually slow but also on any consumer that has not received any messages for
* the maxTimeSinceLastAck. This allows for a way to evict idle consumers while also
* aborting slow consumers.
*
* @param ignoreIdleConsumers
* Should this strategy ignore idle consumers or consider all consumers when checking
* the last ack time verses the maxTimeSinceLastAck value.
*/
public void setIgnoreIdleConsumers(boolean ignoreIdleConsumers) {
this.ignoreIdleConsumers = ignoreIdleConsumers;
}
/**
* Returns whether the strategy is configured to ignore subscriptions that are from a network
* connection.
*
* @return true if the strategy will ignore network connection subscriptions when looking
* for slow consumers.
*/
public boolean isIgnoreNetworkSubscriptions() {
return ignoreNetworkConsumers;
}
/**
* Sets whether the strategy is configured to ignore consumers that are part of a network
* connection to another broker.
*
* When configured to not ignore idle consumers this strategy acts not only on consumers
* that are actually slow but also on any consumer that has not received any messages for
* the maxTimeSinceLastAck. This allows for a way to evict idle consumers while also
* aborting slow consumers however for a network subscription this can create a lot of
* unnecessary churn and if the abort connection option is also enabled this can result
* in the entire network connection being torn down and rebuilt for no reason.
*
* @param ignoreNetworkConsumers
* Should this strategy ignore subscriptions made by a network connector.
*/
public void setIgnoreNetworkConsumers(boolean ignoreNetworkConsumers) {
this.ignoreNetworkConsumers = ignoreNetworkConsumers;
}
}