{"id":332378,"date":"2023-02-11T06:00:58","date_gmt":"2023-02-10T22:00:58","guid":{"rendered":"https:\/\/www.idc.net\/help\/332378\/"},"modified":"2023-02-11T06:00:58","modified_gmt":"2023-02-10T22:00:58","slug":"%e7%9c%9f%e9%a6%99%ef%bc%8c%e8%81%8a%e8%81%8a-rocketmq-5-0-%e7%9a%84-pop-%e6%b6%88%e8%b4%b9%e6%a8%a1%e5%bc%8f%ef%bc%81","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/332378\/","title":{"rendered":"\u771f\u9999\uff0c\u804a\u804a RocketMQ 5.0 \u7684 POP \u6d88\u8d39\u6a21\u5f0f\uff01"},"content":{"rendered":"<p style=\"line-height: 2\">\u5927\u5bb6\u597d\uff0c\u6211\u662f\u541b\u54e5\u3002<\/p>\n<p style=\"line-height: 2\">\u5927\u5bb6\u90fd\u77e5\u9053\uff0cRocketMQ \u6d88\u8d39\u6a21\u5f0f\u6709 PULL \u6a21\u5f0f\u548c PUSH \u6a21\u5f0f\uff0c\u4e0d\u8fc7\u672c\u8d28\u4e0a\u90fd\u662f PULL \u6a21\u5f0f\uff0c\u800c\u5728\u5b9e\u9645\u4f7f\u7528\u65f6\uff0c\u4e00\u822c\u4f7f\u7528 PUSH \u6a21\u5f0f\u3002<\/p>\n<p style=\"line-height: 2\">\u4e0d\u8fc7\uff0cRocketMQ \u7684 PUSH \u6a21\u5f0f\u6709\u660e\u663e\u7684\u4e0d\u8db3\uff0c\u4e3b\u8981\u4f53\u73b0\u5728\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\uff1a<\/p>\n<ol>\n<li>\u6d88\u606f\u79ef\u538b\u4e86\uff0c\u589e\u52a0\u6d88\u8d39\u8005\u4e0d\u4e00\u5b9a\u80fd\u89e3\u51b3\u3002PUSH \u6a21\u5f0f\u5982\u4e0b\u56fe\uff1a<\/li>\n<\/ol>\n<p style=\"text-align:center\">\n<p style=\"line-height: 2\">\u4e0a\u9762\u7684\u56fe\u4e2d\uff0c\u6d88\u8d39\u7ec4\u4e2d\u7684\u6d88\u8d39\u8005\u6bcf\u4e2a\u6d88\u8d39\u8005\u6d88\u8d39\u4e24\u4e2a MessageQueue\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u589e\u52a0\u6d88\u8d39\u8005\u662f\u53ef\u4ee5\u63d0\u9ad8\u6d88\u8d39\u80fd\u529b\u7684\u3002<\/p>\n<p style=\"line-height: 2\">\u4f46\u662f\u4e0b\u9762\u8fd9\u5f20\u56fe\uff0c\u6bcf\u4e2a\u6d88\u8d39\u8005\u6d88\u8d39\u4e00\u4e2a MessageQueue\uff0c\u56e0\u4e3a\u540c\u4e00\u4e2a MessageQueue \u53ea\u80fd\u88ab\u540c\u4e00\u4e2a\u6d88\u8d39\u7ec4\u4e2d\u7684\u4e00\u4e2a\u6d88\u8d39\u8005\u6d88\u8d39\uff0c\u6240\u4ee5\u589e\u52a0\u6d88\u8d39\u8005\u5e76\u4e0d\u80fd\u63d0\u9ad8\u6d88\u8d39\u80fd\u529b\u3002<\/p>\n<p style=\"text-align:center\">\n<ol>\n<li>\u5ba2\u6237\u7aef\u7684\u5904\u7406\u903b\u8f91\u6bd4\u8f83\u591a\uff0c\u6bd4\u5982\u8d1f\u8f7d\u5747\u8861\u3001offset \u7ba1\u7406\u3001\u6d88\u8d39\u5931\u8d25\u540e\u7684\u5904\u7406\uff08\u6bd4\u5982\u5931\u8d25\u6d88\u606f\u53d1\u9001\u56de Broker\uff09\uff0c\u8fd9\u4e9b\u903b\u8f91\u90fd\u5728\u5ba2\u6237\u7aef\u3002<\/li>\n<li>\u5982\u679c\u518d\u652f\u6301\u5176\u4ed6\u8bed\u8a00\uff0c\u5ba2\u6237\u7aef\u4f1a\u53d8\u5f97\u8d8a\u6765\u8d8a\u91cd\u3002<\/li>\n<li>\u6d88\u8d39\u8005\u673a\u5668 hang \u4f4f\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6d88\u606f\u79ef\u538b\uff0c\u5982\u4e0b\u56fe\uff1a<\/li>\n<\/ol>\n<p style=\"text-align:center\">\n<p style=\"line-height: 2\">\u901a\u8fc7\u5ba2\u6237\u7aef\u8d1f\u8d23\u5747\u8861\uff0cMessageQueue0 \u8fd9\u4e2a\u961f\u5217\u5206\u914d\u7ed9\u4e86 Consumer0 \u8fdb\u884c\u72ec\u5360\u6d88\u8d39\uff0c\u5982\u679c Consumer0 \u8fd9\u4e2a\u6d88\u8d39\u8005 hang \u4f4f\u4e86\uff0c\u4f46\u662f\u670d\u52a1\u6ca1\u6709\u6302\uff0c\u4e0d\u80fd\u4ece Name Server \u4e2d\u4e0b\u7ebf\uff0c\u56e0\u4e3a Consumer0 \u62c9\u53d6\u5230\u7684\u6d88\u606f\u4e0d\u80fd\u6d88\u8d39\uff0c\u4e5f\u5c31\u4e0d\u80fd\u7ed9 Broker \u53d1\u9001\u66f4\u65b0 Offset \u7684\u8bf7\u6c42\uff0c\u6700\u7ec8\u5bfc\u81f4\u6d88\u606f\u79ef\u538b\u3002\u8fd9\u79cd\u60c5\u51b5\u53ea\u80fd\u624b\u52a8\u8ba9 Consumer0 \u4e0b\u7ebf\u6216\u8005\u8ba9 Consumer0 \u91cd\u542f\u3002<\/p>\n<p style=\"line-height: 2\">RocketMQ 5.0 \u4e3a\u4e86\u89e3\u51b3 PUSH Consumer \u4e0a\u9762\u7684\u95ee\u9898\uff0c\u5f15\u5165\u4e86 POP Consumer\u3002<\/p>\n<h2>1 POP \u5ba2\u6237\u7aef<\/h2>\n<p style=\"line-height: 2\">POP \u6a21\u5f0f\u7684\u5ba2\u6237\u7aef\u5f15\u5165\u7684\u80cc\u666f\u662f RocketMQ 5.0&nbsp;\u4e3a\u4e86\u66f4\u597d\u5730\u62e5\u62b1\u4e91\u539f\u751f\uff0c\u5ba2\u6237\u7aef\u8981\u6539\u9020\u6210\u65e0\u72b6\u6001\u7684\u8f7b\u91cf\u7ea7\u5ba2\u6237\u7aef\uff0cRocketMQ 4.x \u4e2d\u5ba2\u6237\u7aef\u5177\u6709\u7684\u8d1f\u8f7d\u5747\u8861\u3001\u6743\u9650\u7ba1\u7406\u3001\u6d88\u8d39\u7ba1\u7406\u7b49\u529f\u80fd\u90fd\u4ece\u5ba2\u6237\u7aef\u79fb\u52a8\u5230\u4e86 Proxy\u3002<\/p>\n<p style=\"line-height: 2\">POP \u6d88\u8d39\u6a21\u5f0f\u5982\u4e0b\u56fe\uff1a<\/p>\n<p style=\"text-align:center\">\n<p style=\"line-height: 2\">\u56db\u4e2a\u6d88\u8d39\u8005\u90fd\u53ef\u4ee5\u6d88\u8d39 Broker1 \u548c Broker2 \u4e0a\u9762\u7684\u6240\u6709\u961f\u5217\uff0c\u8fd9\u6837\u5373\u4f7f\u67d0\u4e00\u4e2a\u6d88\u8d39\u8005 hang \u4f4f\u4e86\uff0c\u5176\u4ed6\u6d88\u8d39\u8005\u4e5f\u53ef\u4ee5\u6d88\u8d39\uff0c\u5e76\u4e0d\u4f1a\u9020\u6210\u6d88\u606f\u79ef\u538b\u3002<\/p>\n<p style=\"line-height: 2\">\u540c\u65f6\uff0c\u4ece\u4e0a\u56fe\u4e2d\u53ef\u4ee5\u770b\u5230\uff0cPOP \u5ba2\u6237\u7aef\u8fd8\u6709\u4e00\u4e2a\u4f18\u52bf\uff0c\u589e\u52a0\u6d88\u8d39\u8005\u6570\u91cf\u662f\u53ef\u4ee5\u63d0\u9ad8\u6d88\u8d39\u80fd\u529b\u7684\uff0c\u4e0d\u53d7 MessageQueue \u6570\u91cf\u548c\u6d88\u8d39\u8005\u6570\u91cf\u7684\u9650\u5236\u3002<\/p>\n<p style=\"line-height: 2\">\u8ddf PUSH \u6a21\u5f0f\u76f8\u6bd4\uff0cPOP \u6a21\u5f0f\u62c9\u53d6\u5230\u6d88\u606f\u540e\uff0c\u4f1a\u8bbe\u7f6e\u4e00\u4e2a POP_CK \u5c5e\u6027\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>\/\/MQClientAPIImpl.java\nif (requestHeader instanceof PopMessageRequestHeader) {\n if (startOffsetInfo == null) {\n  \/\/ we should set the check point info to extraInfo field , if the command is popMsg\n  \/\/ find pop ck offset\n  String key = messageExt.getTopic() + messageExt.getQueueId();\n  if (!map.containsKey(messageExt.getTopic() + messageExt.getQueueId())) {\n   map.put(key, ExtraInfoUtil.buildExtraInfo(messageExt.getQueueOffset(), responseHeader.getPopTime(), responseHeader.getInvisibleTime(), responseHeader.getReviveQid(),\n    messageExt.getTopic(), brokerName, messageExt.getQueueId()));\n\n  }\n  messageExt.getProperties().put(MessageConst.PROPERTY_POP_CK, map.get(key) + MessageConst.KEY_SEPARATOR + messageExt.getQueueOffset());\n } else {\n  String queueIdKey = ExtraInfoUtil.getStartOffsetInfoMapKey(messageExt.getTopic(), messageExt.getQueueId());\n  String queueOffsetKey = ExtraInfoUtil.getQueueOffsetMapKey(messageExt.getTopic(), messageExt.getQueueId(), messageExt.getQueueOffset());\n  int index = sortMap.get(queueIdKey).indexOf(messageExt.getQueueOffset());\n  Long msgQueueOffset = msgOffsetInfo.get(queueIdKey).get(index);\n\n  messageExt.getProperties().put(MessageConst.PROPERTY_POP_CK,\n   ExtraInfoUtil.buildExtraInfo(startOffsetInfo.get(queueIdKey), responseHeader.getPopTime(), responseHeader.getInvisibleTime(),\n    responseHeader.getReviveQid(), messageExt.getTopic(), brokerName, messageExt.getQueueId(), msgQueueOffset)\n  );\n  \/\/...\n }\n}<\/code><\/pre>\n<p style=\"line-height: 2\">\u53ef\u4ee5\u770b\u5230\uff0cPOP_CK \u5c5e\u6027\u5305\u542b\u4e86 brokerName\u3001Topic\u3001QueueId\u3001offset \u7b49\u53c2\u6570\uff0c\u901a\u8fc7\u8fd9\u4e2a\u5c5e\u6027\u53ef\u4ee5\u552f\u4e00\u6807\u8bc6\u4e00\u6761\u6d88\u606f\u4e86\u3002<\/p>\n<p style=\"line-height: 2\">\u4ece\u4e0a\u9762\u7684\u4ee3\u7801\u8fd8\u53ef\u4ee5\u770b\u5230\uff0cresponseHeader \u4e2d\u6709\u4e00\u4e2a invisibleTime \u5c5e\u6027\uff0c\u8fd9\u4e2a\u5c5e\u6027\u7684\u4f5c\u7528\u662f\u6d88\u8d39\u8005\u901a\u8fc7 POP \u6a21\u5f0f\u62c9\u53d6\u5230\u4e00\u6761\u6d88\u606f\u540e\uff0c\u8fd9\u6bb5\u65f6\u95f4\uff08invisibleTime\uff09\u5185\u8fd9\u6761\u6d88\u606f\u5728 Broker \u7aef\u662f\u4e0d\u53ef\u89c1\u7684\uff0c\u6d88\u8d39\u8005\u518d\u6b21\u62c9\u53d6\u5c31\u4e0d\u4f1a\u91cd\u590d\u62c9\u53d6\u5230\u3002\u4f46\u662f\u5982\u679c\u8fc7\u4e86\u8fd9\u6bb5\u65f6\u95f4\uff0c\u6d88\u8d39\u8005\u8fd8\u6ca1\u6709\u7ed9 Broker \u8fd4\u56de ACK\uff0c\u8fd9\u6761\u6d88\u606f\u4f1a\u53d8\u4e3a\u53ef\u89c1\uff0c\u518d\u6b21\u88ab\u6d88\u8d39\u8005\u62c9\u53d6\u5230\u3002<\/p>\n<p style=\"line-height: 2\">\u6d88\u8d39\u5b8c\u6210\u540e\uff0c\u5411 Broker \u53d1\u9001 ACK \u6d88\u606f\uff0c\u89c1\u4e0b\u9762\u4ee3\u7801\uff1a<\/p>\n<pre><code>public void ackMessageAsync(\n final String addr,\n final long timeOut,\n final AckCallback ackCallback,\n final AckMessageRequestHeader requestHeader \/\/\n) throws RemotingException, MQBrokerException, InterruptedException {\n final RemotingCommand request = RemotingCommand.createRequestCommand(RequestCode.ACK_MESSAGE, requestHeader);\n this.remotingClient.invokeAsync(addr, request, timeOut, new BaseInvokeCallback(MQClientAPIImpl.this) {\n\n  @Override\n  public void onComplete(ResponseFuture responseFuture) {\n   RemotingCommand response = responseFuture.getResponseCommand();\n   if (response != null) {\n    try {\n     AckResult ackResult = new AckResult();\n     if (ResponseCode.SUCCESS == response.getCode()) {\n      ackResult.setStatus(AckStatus.OK);\n     } \/\/...\n     assert ackResult != null;\n     ackCallback.onSuccess(ackResult);\n    } \/\/...\n   } else {\n    \/\/...\n   }\n\n  }\n });\n}<\/code><\/pre>\n<h2>2. Broker<\/h2>\n<p style=\"line-height: 2\">\u4ece\u4e0a\u9762\u7684\u4ecb\u7ecd\u53ef\u4ee5\u770b\u5230\uff0c\u6bcf\u4e2a\u6d88\u8d39\u8005\u90fd\u53ef\u4ee5\u4ece Broker \u7684\u6240\u6709 MessageQueue \u4e0a\u62c9\u53d6\u6d88\u606f\uff0c\u90a3\u5982\u679c\u591a\u4e2a\u6d88\u8d39\u8005\u90fd\u4ece\u4e00\u4e2a MessageQueue \u4e0a\u9762\u62c9\u53d6\uff0c\u6709\u6ca1\u6709\u53ef\u80fd\u4f1a\u91cd\u590d\u6d88\u8d39\u5462\uff1f<\/p>\n<p style=\"line-height: 2\">Broker \u6536\u5230\u6d88\u606f\u62c9\u53d6\u8bf7\u6c42\uff0c\u4ece MessageStore \u62c9\u53d6\u6d88\u606f\u65f6\uff0c\u9996\u5148\u4f1a\u7ed9 MessageQueue \u8fdb\u884c\u52a0\u9501\uff0c\u52a0\u9501\u6210\u529f\u540e\uff0c\u624d\u4f1a\u62c9\u53d6\u6d88\u606f\uff0c\u8fd9\u662f\u5176\u4ed6\u5ba2\u6237\u7aef\u6765\u62c9\u53d6\u65f6\u5c31\u4f1a\u52a0\u9501\u5931\u8d25\u3002<\/p>\n<pre><code>\/\/PopMessageProcessor.java\nString lockKey = topic + PopAckConstants.SPLIT + requestHeader.getConsumerGroup() + PopAckConstants.SPLIT + queueId;\nlong offset = getPopOffset(topic, requestHeader, queueId, false, lockKey);\nif (!queueLockManager.tryLock(lockKey)) {\n restNum = this.brokerController.getMessageStore().getMaxOffsetInQueue(topic, queueId) - offset + restNum;\n return restNum;\n}<\/code><\/pre>\n<p style=\"line-height: 2\">Broker \u4ece MessageStore \u62c9\u53d6\u5230\u6d88\u606f\u540e\uff0c\u4f1a\u5b9a\u4e49\u4e00\u4e2a CheckPoint \u653e\u5165\u7f13\u5b58\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>\/\/PopMessageProcessor.java\nprivate long popMsgFromQueue(boolean isRetry, GetMessageResult getMessageResult,\n PopMessageRequestHeader requestHeader, int queueId, long restNum, int reviveQid,\n Channel channel, long popTime,\n ExpressionMessageFilter messageFilter, StringBuilder startOffsetInfo,\n StringBuilder msgOffsetInfo, StringBuilder orderCountInfo) {\n String topic = isRetry ? KeyBuilder.buildPopRetryTopic(requestHeader.getTopic(),\n  requestHeader.getConsumerGroup()) : requestHeader.getTopic();\n String lockKey =\n  topic + PopAckConstants.SPLIT + requestHeader.getConsumerGroup() + PopAckConstants.SPLIT + queueId;\n \/\/...\n offset = getPopOffset(topic, requestHeader, queueId, true, lockKey);\n GetMessageResult getMessageTmpResult = null;\n try {\n  \/\/...\n\n  restNum = getMessageTmpResult.getMaxOffset() - getMessageTmpResult.getNextBeginOffset() + restNum;\n  if (!getMessageTmpResult.getMessageMapedList().isEmpty()) {\n\n   if (isOrder) {\n    \/\/...\n   } else {\n    appendCheckPoint(requestHeader, topic, reviveQid, queueId, offset, getMessageTmpResult, popTime, this.brokerController.getBrokerConfig().getBrokerName());\n   }\n  } \/\/...\n } \/\/...\n return restNum;\n}<\/code><\/pre>\n<p style=\"line-height: 2\">Broker \u6536\u5230\u6d88\u8d39\u8005\u53d1\u6765\u7684 ACK \u540e\uff0c\u4f1a\u628a CheckPoint \u4ece\u7f13\u5b58\u4e2d\u79fb\u9664\u3002<\/p>\n<p style=\"line-height: 2\">\u5982\u679c Broker \u4e00\u76f4\u6ca1\u6709\u6536\u5230 ACK\uff0c\u5219\u4f1a\u628a CheckPoint \u4ece\u7f13\u5b58\u4e2d\u79fb\u9664\uff0c\u540c\u65f6\u628a CheckPoint \u53d1\u9001\u7ed9 MessageStore\uff0c\u7531 MessageStore \u53d1\u9001\u5230\u91cd\u8bd5\u961f\u5217\u3002\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>boolean removeCk = !this.serving;\n \/\/ ck will be timeout\n if (point.getReviveTime() - now &lt; brokerController.getBrokerConfig().getPopCkStayBufferTimeOut()) {\n  removeCk = true;\n }\n\n \/\/ the time stayed is too long\n if (now - point.getPopTime() &gt; brokerController.getBrokerConfig().getPopCkStayBufferTime()) {\n  removeCk = true;\n }\n\n \/\/ double check\n if (removeCk) {\n  \/\/ put buffer ak to store\n  if (pointWrapper.getReviveQueueOffset() &lt; 0) {\n   putCkToStore(pointWrapper, false);\n  }\n }\n}<\/code><\/pre>\n<h2>3 \u603b\u7ed3<\/h2>\n<p style=\"line-height: 2\">POP \u5ba2\u6237\u7aef\u6709\u5f88\u591a\u7684\u4f18\u52bf\uff0c\u603b\u7ed3\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u65e0\u72b6\u6001\uff0c\u66f4\u597d\u5730\u62e5\u62b1\u4e91\u539f\u751f\uff1b<\/li>\n<li>\u8ba1\u7b97\u76f8\u5173\u7684\u529f\u80fd\u4e0b\u79fb\u5230 Proxy\uff0c\u66f4\u52a0\u8f7b\u91cf\u7ea7\uff1b<\/li>\n<li>\u6d88\u8d39\u80fd\u529b\u6269\u5c55\u4e0d\u53d7 MessageQueue \u6570\u91cf\u7684\u9650\u5236\uff1b<\/li>\n<li>\u6d88\u8d39\u8005 hang \u4f4f\uff0c\u5e76\u4e0d\u4f1a\u5bfc\u81f4\u6d88\u606f\u79ef\u538b\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>\u5927\u5bb6\u597d\uff0c\u6211\u662f\u541b\u54e5\u3002 \u5927\u5bb6\u90fd\u77e5\u9053\uff0cRocketMQ \u6d88\u8d39\u6a21\u5f0f\u6709 PULL \u6a21\u5f0f\u548c PUSH \u6a21\u5f0f\uff0c\u4e0d\u8fc7\u672c\u8d28\u4e0a\u90fd\u662f [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":332379,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[61],"tags":[],"class_list":["post-332378","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-website"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/332378","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=332378"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/332378\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media\/332379"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=332378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=332378"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=332378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}