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再说rocketmq消息存储
rocketmq通过netty获取到消息请求后，直接掉处理模块，比如：SendMessageProcessor
这个处理类主要负责处理客户端发送消息的请求。
这个类实现了com.alibaba.rocketmq.remoting.netty.NettyRequestProcessor接口。这个接口下一共两个方法：
RemotingCommand processRequest(ChannelHandlerContext ctx, RemotingCommand request)
throws Exception;
boolean rejectRequest();
加粗的方法是我们接下来要讲的方法。
它同时还继承了com.alibaba.rocketmq.broker.processor.AbstractSendMessageProcessor。
我们先看一下这个过程的调用链：
这里有一篇博客写的特别好：http://www.cnblogs.com/sunshine-2015/p/6291116.html
再次基础之上补充一点点东西。
首先进入SendMessageProcessor类的第一个方法是：
这个类什么时候被调用的呢？肯定是netty通信模块接收到消息后调用了，具体实在这里：
就是箭头所指的地方调用的上面那个方法。
我们看一下完整的从netty通信模块接收消息到这里的整个过程：
现在就到了我们非常熟悉的Handler了。
这里从下往上看会更加的直观。
好了，我们接着往消息存储走。
我们进入这个方法：
private RemotingCommand sendMessage(final ChannelHandlerContext ctx, // final RemotingCommand request, // final SendMessageContext sendMessageContext, // final SendMessageRequestHeader requestHeader) throws RemotingCommandException { final RemotingCommand response = RemotingCommand.createResponseCommand(SendMessageResponseHeader.class); final SendMessageResponseHeader responseHeader = (SendMessageResponseHeader) response.readCustomHeader(); response.setOpaque(request.getOpaque()); response.addExtField(MessageConst.PROPERTY_MSG_REGION,this.brokerController.getBrokerConfig().getRegionId()); if (log.isDebugEnabled()) { log.debug("receive SendMessage request command, " + request); } final long startTimstamp = this.brokerController.getBrokerConfig().getStartAcceptSendRequestTimeStamp(); if (this.brokerController.getMessageStore().now() < startTimstamp) { response.setCode(ResponseCode.SYSTEM_ERROR); response.setRemark(String.format("broker unable to service, until %s", UtilAll.timeMillisToHumanString2(startTimstamp))); return response; } response.setCode(-1); super.msgCheck(ctx, requestHeader, response); if (response.getCode() != -1) { return response; } final byte[] body = request.getBody(); int queueIdInt = requestHeader.getQueueId(); TopicConfig topicConfig = this.brokerController.getTopicConfigManager().selectTopicConfig(requestHeader.getTopic()); if (queueIdInt < 0) { queueIdInt = Math.abs(this.random.nextInt() % 99999999) % topicConfig.getWriteQueueNums(); } int sysFlag = requestHeader.getSysFlag(); if (TopicFilterType.MULTI_TAG == topicConfig.getTopicFilterType()) { sysFlag |= MessageSysFlag.MultiTagsFlag; } String newTopic = requestHeader.getTopic(); if ((null != newTopic && newTopic.startsWith(MixAll.RETRY_GROUP_TOPIC_PREFIX))) { String groupName = newTopic.substring(MixAll.RETRY_GROUP_TOPIC_PREFIX.length()); SubscriptionGroupConfig subscriptionGroupConfig = this.brokerController.getSubscriptionGroupManager().findSubscriptionGroupConfig(groupName); if (null == subscriptionGroupConfig) { response.setCode(ResponseCode.SUBSCRIPTION_GROUP_NOT_EXIST); response.setRemark( "subscription group not exist, " + groupName + " " + FAQUrl.suggestTodo(FAQUrl.SUBSCRIPTION_GROUP_NOT_EXIST)); return response; } int maxReconsumeTimes = subscriptionGroupConfig.getRetryMaxTimes(); if (request.getVersion() >= MQVersion.Version.V3_4_9.ordinal()) { maxReconsumeTimes = requestHeader.getMaxReconsumeTimes(); } int reconsumeTimes = requestHeader.getReconsumeTimes(); if (reconsumeTimes >= maxReconsumeTimes) { newTopic = MixAll.getDLQTopic(groupName); queueIdInt = Math.abs(this.random.nextInt() % 99999999) % DLQ_NUMS_PER_GROUP; topicConfig = this.brokerController.getTopicConfigManager().createTopicInSendMessageBackMethod(newTopic, // DLQ_NUMS_PER_GROUP, // PermName.PERM_WRITE, 0 ); if (null == topicConfig) { response.setCode(ResponseCode.SYSTEM_ERROR); response.setRemark("topic[" + newTopic + "] not exist"); return response; } } } MessageExtBrokerInner msgInner = new MessageExtBrokerInner(); msgInner.setTopic(newTopic); msgInner.setBody(body); msgInner.setFlag(requestHeader.getFlag()); MessageAccessor.setProperties(msgInner, MessageDecoder.string2messageProperties(requestHeader.getProperties())); msgInner.setPropertiesString(requestHeader.getProperties()); msgInner.setTagsCode(MessageExtBrokerInner.tagsString2tagsCode(topicConfig.getTopicFilterType(), msgInner.getTags())); msgInner.setQueueId(queueIdInt); msgInner.setSysFlag(sysFlag); msgInner.setBornTimestamp(requestHeader.getBornTimestamp()); msgInner.setBornHost(ctx.channel().remoteAddress()); msgInner.setStoreHost(this.getStoreHost()); msgInner.setReconsumeTimes(requestHeader.getReconsumeTimes() == null ? 0 : requestHeader.getReconsumeTimes()); if (this.brokerController.getBrokerConfig().isRejectTransactionMessage()) { String traFlag = msgInner.getProperty(MessageConst.PROPERTY_TRANSACTION_PREPARED); if (traFlag != null) { response.setCode(ResponseCode.NO_PERMISSION); response.setRemark( "the broker[" + this.brokerController.getBrokerConfig().getBrokerIP1() + "] sending transaction message is forbidden"); return response; } } // 前面是一些系统检查和数据准备，下面进入消息存储环节。 PutMessageResult putMessageResult = this.brokerController.getMessageStore().putMessage(msgInner); if (putMessageResult != null) { boolean sendOK = false; switch (putMessageResult.getPutMessageStatus()) { // Success case PUT_OK: sendOK = true; response.setCode(ResponseCode.SUCCESS); break; case FLUSH_DISK_TIMEOUT: response.setCode(ResponseCode.FLUSH_DISK_TIMEOUT); sendOK = true; break; case FLUSH_SLAVE_TIMEOUT: response.setCode(ResponseCode.FLUSH_SLAVE_TIMEOUT); sendOK = true; break; case SLAVE_NOT_AVAILABLE: response.setCode(ResponseCode.SLAVE_NOT_AVAILABLE); sendOK = true; break; // Failed case CREATE_MAPEDFILE_FAILED: response.setCode(ResponseCode.SYSTEM_ERROR); response.setRemark("create maped file failed, please make sure OS and JDK both 64bit."); break; case MESSAGE_ILLEGAL: case PROPERTIES_SIZE_EXCEEDED: response.setCode(ResponseCode.MESSAGE_ILLEGAL); response.setRemark( "the message is illegal, maybe msg body or properties length not matched. msg body length limit 128k, msg properties length limit 32k."); break; case SERVICE_NOT_AVAILABLE: response.setCode(ResponseCode.SERVICE_NOT_AVAILABLE); response.setRemark( "service not available now, maybe disk full, " + diskUtil() + ", maybe your broker machine memory too small."); break; case OS_PAGECACHE_BUSY: response.setCode(ResponseCode.SYSTEM_ERROR); response.setRemark("[PC_SYNCHRONIZED]broker busy, start flow control for a while"); break; case UNKNOWN_ERROR: response.setCode(ResponseCode.SYSTEM_ERROR); response.setRemark("UNKNOWN_ERROR"); break; default: response.setCode(ResponseCode.SYSTEM_ERROR); response.setRemark("UNKNOWN_ERROR DEFAULT"); break; } String owner = request.getExtFields().get(BrokerStatsManager.COMMERCIAL_OWNER); if (sendOK) { this.brokerController.getBrokerStatsManager().incTopicPutNums(msgInner.getTopic()); this.brokerController.getBrokerStatsManager().incTopicPutSize(msgInner.getTopic(), putMessageResult.getAppendMessageResult().getWroteBytes()); this.brokerController.getBrokerStatsManager().incBrokerPutNums(); response.setRemark(null); responseHeader.setMsgId(putMessageResult.getAppendMessageResult().getMsgId()); responseHeader.setQueueId(queueIdInt); responseHeader.setQueueOffset(putMessageResult.getAppendMessageResult().getLogicsOffset()); doResponse(ctx, request, response); if (hasSendMessageHook()) { sendMessageContext.setMsgId(responseHeader.getMsgId()); sendMessageContext.setQueueId(responseHeader.getQueueId()); sendMessageContext.setQueueOffset(responseHeader.getQueueOffset()); int wroteSize = putMessageResult.getAppendMessageResult().getWroteBytes(); int incValue = http://www.mamicode.com/(int) Math.ceil(wroteSize / BrokerStatsManager.SIZE_PER_COUNT); sendMessageContext.setCommercialSendStats(BrokerStatsManager.StatsType.SEND_SUCCESS); sendMessageContext.setCommercialSendTimes(incValue); sendMessageContext.setCommercialSendSize(wroteSize); sendMessageContext.setCommercialOwner(owner); } return null; } else { if (hasSendMessageHook()) { int wroteSize = request.getBody().length; int incValue = http://www.mamicode.com/(int) Math.ceil(wroteSize / BrokerStatsManager.SIZE_PER_COUNT); sendMessageContext.setCommercialSendStats(BrokerStatsManager.StatsType.SEND_FAILURE); sendMessageContext.setCommercialSendTimes(incValue); sendMessageContext.setCommercialSendSize(wroteSize); sendMessageContext.setCommercialOwner(owner); } } } else { response.setCode(ResponseCode.SYSTEM_ERROR); response.setRemark("store putMessage return null"); } return response; }
我们进入PutMessageResult putMessageResult = this.brokerController.getMessageStore().putMessage(msgInner);
的MessageStore.putMessage(msgInner)方法。
MesageStore这个接口一共有三个实现类：
实现了上面那个方法的只有DefaultMessageStore实现类。所以我们看DefaultMessageStore.putMessage(MessageExtBrokerInner msg)方法。
public PutMessageResult putMessage(MessageExtBrokerInner msg) { if (this.shutdown) { log.warn("message store has shutdown, so putMessage is forbidden"); return new PutMessageResult(PutMessageStatus.SERVICE_NOT_AVAILABLE, null); } if (BrokerRole.SLAVE == this.messageStoreConfig.getBrokerRole()) { long value = http://www.mamicode.com/this.printTimes.getAndIncrement(); if ((value % 50000) == 0) { log.warn("message store is slave mode, so putMessage is forbidden "); } return new PutMessageResult(PutMessageStatus.SERVICE_NOT_AVAILABLE, null); } if (!this.runningFlags.isWriteable()) { long value = http://www.mamicode.com/this.printTimes.getAndIncrement(); if ((value % 50000) == 0) { log.warn("message store is not writeable, so putMessage is forbidden " + this.runningFlags.getFlagBits()); } return new PutMessageResult(PutMessageStatus.SERVICE_NOT_AVAILABLE, null); } else { this.printTimes.set(0); } // message topic长度校验 if (msg.getTopic().length() > Byte.MAX_VALUE) { log.warn("putMessage message topic length too long " + msg.getTopic().length()); return new PutMessageResult(PutMessageStatus.MESSAGE_ILLEGAL, null); } // message properties长度校验 if (msg.getPropertiesString() != null && msg.getPropertiesString().length() > Short.MAX_VALUE) { log.warn("putMessage message properties length too long " + msg.getPropertiesString().length()); return new PutMessageResult(PutMessageStatus.PROPERTIES_SIZE_EXCEEDED, null); } if (this.isOSPageCacheBusy()) { return new PutMessageResult(PutMessageStatus.OS_PAGECACHE_BUSY, null); } long beginTime = this.getSystemClock().now();
//上面是一些系统检查，下面是消息的存储 PutMessageResult result = this.commitLog.putMessage(msg); // 性能数据统计 long eclipseTime = this.getSystemClock().now() - beginTime; if (eclipseTime > 1000) { log.warn("putMessage not in lock eclipse time(ms)={}, bodyLength={}", eclipseTime, msg.getBody().length); } this.storeStatsService.setPutMessageEntireTimeMax(eclipseTime); if (null == result || !result.isOk()) { this.storeStatsService.getPutMessageFailedTimes().incrementAndGet(); } return result; }
其中commitLog在构造方法中的初始化：this.commitLog = new CommitLog(this);
我们接着进入commitLog.putMessage(final MessageExtBrokerInner msg)
这个方法搞定了，你也就彻底了解了rocketmq的消息存储过程了。
public PutMessageResult putMessage(final MessageExtBrokerInner msg) { // Set the storage time msg.setStoreTimestamp(System.currentTimeMillis()); // Set the message body BODY CRC (consider the most appropriate setting // on the client) msg.setBodyCRC(UtilAll.crc32(msg.getBody())); // Back to Results AppendMessageResult result = null; StoreStatsService storeStatsService = this.defaultMessageStore.getStoreStatsService(); String topic = msg.getTopic(); int queueId = msg.getQueueId(); final int tranType = MessageSysFlag.getTransactionValue(msg.getSysFlag()); if (tranType == MessageSysFlag.TransactionNotType// || tranType == MessageSysFlag.TransactionCommitType) { // Delay Delivery if (msg.getDelayTimeLevel() > 0) { if (msg.getDelayTimeLevel() > this.defaultMessageStore.getScheduleMessageService().getMaxDelayLevel()) { msg.setDelayTimeLevel(this.defaultMessageStore.getScheduleMessageService().getMaxDelayLevel()); } topic = ScheduleMessageService.SCHEDULE_TOPIC; queueId = ScheduleMessageService.delayLevel2QueueId(msg.getDelayTimeLevel()); // Backup real topic, queueId MessageAccessor.putProperty(msg, MessageConst.PROPERTY_REAL_TOPIC, msg.getTopic()); MessageAccessor.putProperty(msg, MessageConst.PROPERTY_REAL_QUEUE_ID, String.valueOf(msg.getQueueId())); msg.setPropertiesString(MessageDecoder.messageProperties2String(msg.getProperties())); msg.setTopic(topic); msg.setQueueId(queueId); } } long eclipseTimeInLock = 0; MapedFile unlockMapedFile = null; MapedFile mapedFile = this.mapedFileQueue.getLastMapedFileWithLock(); synchronized (this) { long beginLockTimestamp = this.defaultMessageStore.getSystemClock().now(); this.beginTimeInLock = beginLockTimestamp; // Here settings are stored timestamp, in order to ensure an orderly // global msg.setStoreTimestamp(beginLockTimestamp); if (null == mapedFile || mapedFile.isFull()) { mapedFile = this.mapedFileQueue.getLastMapedFile(); } if (null == mapedFile) { log.error("create maped file1 error, topic: " + msg.getTopic() + " clientAddr: " + msg.getBornHostString()); beginTimeInLock = 0; return new PutMessageResult(PutMessageStatus.CREATE_MAPEDFILE_FAILED, null); } result = mapedFile.appendMessage(msg, this.appendMessageCallback); switch (result.getStatus()) { case PUT_OK: break; case END_OF_FILE: unlockMapedFile = mapedFile; // Create a new file, re-write the message mapedFile = this.mapedFileQueue.getLastMapedFile(); if (null == mapedFile) { // XXX: warn and notify me log.error("create maped file2 error, topic: " + msg.getTopic() + " clientAddr: " + msg.getBornHostString()); beginTimeInLock = 0; return new PutMessageResult(PutMessageStatus.CREATE_MAPEDFILE_FAILED, result); } result = mapedFile.appendMessage(msg, this.appendMessageCallback); break; case MESSAGE_SIZE_EXCEEDED: case PROPERTIES_SIZE_EXCEEDED: beginTimeInLock = 0; return new PutMessageResult(PutMessageStatus.MESSAGE_ILLEGAL, result); case UNKNOWN_ERROR: beginTimeInLock = 0; return new PutMessageResult(PutMessageStatus.UNKNOWN_ERROR, result); default: beginTimeInLock = 0; return new PutMessageResult(PutMessageStatus.UNKNOWN_ERROR, result); } eclipseTimeInLock = this.defaultMessageStore.getSystemClock().now() - beginLockTimestamp; beginTimeInLock = 0; } // end of synchronized if (eclipseTimeInLock > 1000) { log.warn("[NOTIFYME]putMessage in lock cost time(ms)={}, bodyLength={} AppendMessageResult={}", eclipseTimeInLock, msg.getBody().length, result); } if (null != unlockMapedFile) { this.defaultMessageStore.unlockMapedFile(unlockMapedFile); } PutMessageResult putMessageResult = new PutMessageResult(PutMessageStatus.PUT_OK, result); // Statistics storeStatsService.getSinglePutMessageTopicTimesTotal(msg.getTopic()).incrementAndGet(); storeStatsService.getSinglePutMessageTopicSizeTotal(topic).addAndGet(result.getWroteBytes()); GroupCommitRequest request = null; // Synchronization flush if (FlushDiskType.SYNC_FLUSH == this.defaultMessageStore.getMessageStoreConfig().getFlushDiskType()) { GroupCommitService service = (GroupCommitService) this.flushCommitLogService; if (msg.isWaitStoreMsgOK()) { request = new GroupCommitRequest(result.getWroteOffset() + result.getWroteBytes()); service.putRequest(request); boolean flushOK = request.waitForFlush(this.defaultMessageStore.getMessageStoreConfig().getSyncFlushTimeout()); if (!flushOK) { log.error("do groupcommit, wait for flush failed, topic: " + msg.getTopic() + " tags: " + msg.getTags() + " client address: " + msg.getBornHostString()); putMessageResult.setPutMessageStatus(PutMessageStatus.FLUSH_DISK_TIMEOUT); } } else { service.wakeup(); } } // Asynchronous flush else { this.flushCommitLogService.wakeup(); } // Synchronous write double if (BrokerRole.SYNC_MASTER == this.defaultMessageStore.getMessageStoreConfig().getBrokerRole()) { HAService service = this.defaultMessageStore.getHaService(); if (msg.isWaitStoreMsgOK()) { // Determine whether to wait if (service.isSlaveOK(result.getWroteOffset() + result.getWroteBytes())) { if (null == request) { request = new GroupCommitRequest(result.getWroteOffset() + result.getWroteBytes()); } service.putRequest(request); service.getWaitNotifyObject().wakeupAll(); boolean flushOK = // TODO request.waitForFlush(this.defaultMessageStore.getMessageStoreConfig().getSyncFlushTimeout()); if (!flushOK) { log.error("do sync transfer other node, wait return, but failed, topic: " + msg.getTopic() + " tags: " + msg.getTags() + " client address: " + msg.getBornHostString()); putMessageResult.setPutMessageStatus(PutMessageStatus.FLUSH_SLAVE_TIMEOUT); } } // Slave problem else { // Tell the producer, slave not available putMessageResult.setPutMessageStatus(PutMessageStatus.SLAVE_NOT_AVAILABLE); } } } return putMessageResult; }
再说rocketmq消息存储
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