聊聊rocketmq的MQFaultStrategy
- 2019 年 12 月 12 日
- 筆記
本文主要研究一下rocketmq的MQFaultStrategy
MQFaultStrategy
rocketmq-client-4.6.0-sources.jar!/org/apache/rocketmq/client/latency/MQFaultStrategy.java
public class MQFaultStrategy { private final static InternalLogger log = ClientLogger.getLog(); private final LatencyFaultTolerance<String> latencyFaultTolerance = new LatencyFaultToleranceImpl(); private boolean sendLatencyFaultEnable = false; private long[] latencyMax = {50L, 100L, 550L, 1000L, 2000L, 3000L, 15000L}; private long[] notAvailableDuration = {0L, 0L, 30000L, 60000L, 120000L, 180000L, 600000L}; public long[] getNotAvailableDuration() { return notAvailableDuration; } public void setNotAvailableDuration(final long[] notAvailableDuration) { this.notAvailableDuration = notAvailableDuration; } public long[] getLatencyMax() { return latencyMax; } public void setLatencyMax(final long[] latencyMax) { this.latencyMax = latencyMax; } public boolean isSendLatencyFaultEnable() { return sendLatencyFaultEnable; } public void setSendLatencyFaultEnable(final boolean sendLatencyFaultEnable) { this.sendLatencyFaultEnable = sendLatencyFaultEnable; } public MessageQueue selectOneMessageQueue(final TopicPublishInfo tpInfo, final String lastBrokerName) { if (this.sendLatencyFaultEnable) { try { int index = tpInfo.getSendWhichQueue().getAndIncrement(); for (int i = 0; i < tpInfo.getMessageQueueList().size(); i++) { int pos = Math.abs(index++) % tpInfo.getMessageQueueList().size(); if (pos < 0) pos = 0; MessageQueue mq = tpInfo.getMessageQueueList().get(pos); if (latencyFaultTolerance.isAvailable(mq.getBrokerName())) { if (null == lastBrokerName || mq.getBrokerName().equals(lastBrokerName)) return mq; } } final String notBestBroker = latencyFaultTolerance.pickOneAtLeast(); int writeQueueNums = tpInfo.getQueueIdByBroker(notBestBroker); if (writeQueueNums > 0) { final MessageQueue mq = tpInfo.selectOneMessageQueue(); if (notBestBroker != null) { mq.setBrokerName(notBestBroker); mq.setQueueId(tpInfo.getSendWhichQueue().getAndIncrement() % writeQueueNums); } return mq; } else { latencyFaultTolerance.remove(notBestBroker); } } catch (Exception e) { log.error("Error occurred when selecting message queue", e); } return tpInfo.selectOneMessageQueue(); } return tpInfo.selectOneMessageQueue(lastBrokerName); } public void updateFaultItem(final String brokerName, final long currentLatency, boolean isolation) { if (this.sendLatencyFaultEnable) { long duration = computeNotAvailableDuration(isolation ? 30000 : currentLatency); this.latencyFaultTolerance.updateFaultItem(brokerName, currentLatency, duration); } } private long computeNotAvailableDuration(final long currentLatency) { for (int i = latencyMax.length - 1; i >= 0; i--) { if (currentLatency >= latencyMax[i]) return this.notAvailableDuration[i]; } return 0; } }
- MQFaultStrategy定义了latencyFaultTolerance、sendLatencyFaultEnable、latencyMax、notAvailableDuration属性；其selectOneMessageQueue方法在sendLatencyFaultEnable为false的时候使用的是tpInfo.selectOneMessageQueue(lastBrokerName)；在sendLatencyFaultEnable为true时，先通过tpInfo.getSendWhichQueue().getAndIncrement()获取index，之后遍历tpInfo.getMessageQueueList()，计算pos(
Math.abs(index++) % tpInfo.getMessageQueueList().size())，若小于0则重置为0；然后使用latencyFaultTolerance.isAvailable来判断是否可用，若可用且null == lastBrokerName或者mq.getBrokerName().equals(lastBrokerName)则返回该MessageQueue - selectOneMessageQueue方法在sendLatencyFaultEnable为true时，若遍历tpInfo.getMessageQueueList()都不可用，则通过latencyFaultTolerance.pickOneAtLeast()方法来选择notBestBroker，若其writeQueueNums大于0，则通过tpInfo.selectOneMessageQueue()选择MessageQueue，设置其brokerName为notBestBroker，设置其queueId为(
tpInfo.getSendWhichQueue().getAndIncrement() % writeQueueNums)；若writeQueueNums小于等于0则执行latencyFaultTolerance.remove(notBestBroker)；如果前面没有选出MessageQueue则最后使用tpInfo.selectOneMessageQueue() - 其updateFaultItem方法在sendLatencyFaultEnable为true时会使用computeNotAvailableDuration计算duration，然后通过latencyFaultTolerance.updateFaultItem(brokerName, currentLatency, duration)来更新；computeNotAvailableDuration方法则从后开始遍历latencyMax，在找到
currentLatency >= latencyMax[i]时返回notAvailableDuration[i]，否则最后返回0
DefaultMQProducerImpl
rocketmq-client-4.6.0-sources.jar!/org/apache/rocketmq/client/impl/producer/DefaultMQProducerImpl.java
public class DefaultMQProducerImpl implements MQProducerInner { private final InternalLogger log = ClientLogger.getLog(); private final Random random = new Random(); private final DefaultMQProducer defaultMQProducer; private final ConcurrentMap<String/* topic */, TopicPublishInfo> topicPublishInfoTable = new ConcurrentHashMap<String, TopicPublishInfo>(); private final ArrayList<SendMessageHook> sendMessageHookList = new ArrayList<SendMessageHook>(); private final RPCHook rpcHook; private final BlockingQueue<Runnable> asyncSenderThreadPoolQueue; private final ExecutorService defaultAsyncSenderExecutor; private final Timer timer = new Timer("RequestHouseKeepingService", true); protected BlockingQueue<Runnable> checkRequestQueue; protected ExecutorService checkExecutor; private ServiceState serviceState = ServiceState.CREATE_JUST; private MQClientInstance mQClientFactory; private ArrayList<CheckForbiddenHook> checkForbiddenHookList = new ArrayList<CheckForbiddenHook>(); private int zipCompressLevel = Integer.parseInt(System.getProperty(MixAll.MESSAGE_COMPRESS_LEVEL, "5")); private MQFaultStrategy mqFaultStrategy = new MQFaultStrategy(); private ExecutorService asyncSenderExecutor; //...... public MessageQueue selectOneMessageQueue(final TopicPublishInfo tpInfo, final String lastBrokerName) { return this.mqFaultStrategy.selectOneMessageQueue(tpInfo, lastBrokerName); } public void updateFaultItem(final String brokerName, final long currentLatency, boolean isolation) { this.mqFaultStrategy.updateFaultItem(brokerName, currentLatency, isolation); } //...... }
- DefaultMQProducerImpl的selectOneMessageQueue、updateFaultItem方法均委托给mqFaultStrategy来执行
小结
- MQFaultStrategy定义了latencyFaultTolerance、sendLatencyFaultEnable、latencyMax、notAvailableDuration属性；其selectOneMessageQueue方法在sendLatencyFaultEnable为false的时候使用的是tpInfo.selectOneMessageQueue(lastBrokerName)；在sendLatencyFaultEnable为true时，先通过tpInfo.getSendWhichQueue().getAndIncrement()获取index，之后遍历tpInfo.getMessageQueueList()，计算pos(
Math.abs(index++) % tpInfo.getMessageQueueList().size())，若小于0则重置为0；然后使用latencyFaultTolerance.isAvailable来判断是否可用，若可用且null == lastBrokerName或者mq.getBrokerName().equals(lastBrokerName)则返回该MessageQueue - selectOneMessageQueue方法在sendLatencyFaultEnable为true时，若遍历tpInfo.getMessageQueueList()都不可用，则通过latencyFaultTolerance.pickOneAtLeast()方法来选择notBestBroker，若其writeQueueNums大于0，则通过tpInfo.selectOneMessageQueue()选择MessageQueue，设置其brokerName为notBestBroker，设置其queueId为(
tpInfo.getSendWhichQueue().getAndIncrement() % writeQueueNums)；若writeQueueNums小于等于0则执行latencyFaultTolerance.remove(notBestBroker)；如果前面没有选出MessageQueue则最后使用tpInfo.selectOneMessageQueue() - 其updateFaultItem方法在sendLatencyFaultEnable为true时会使用computeNotAvailableDuration计算duration，然后通过latencyFaultTolerance.updateFaultItem(brokerName, currentLatency, duration)来更新；computeNotAvailableDuration方法则从后开始遍历latencyMax，在找到
currentLatency >= latencyMax[i]时返回notAvailableDuration[i]，否则最后返回0
doc
- MQFaultStrategy
