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Get map file schematic If the current file is full or the space is less than the current message length, you need to create a new filecommitlog[1G] files need to be created through allocateMappedFileServiceBuild two requests each time [create two commitlog files] and add them to the task poolThe additional message thread is blocked through ...

This article mainly involves the following contents when sending a message:Queue selection mechanism for sequential messagesRocketMQ keyRocketMQ tagRocketMQ msgIdQueue selection mechanism for sequential messagesIn many business scenarios, it is necessary to ensure the sequential processing of messages. For example, when orders flow to different ...

1, Principle of RocketMQ transaction message: RocketMQ implements complete transaction messages after version 4.3. The MQ based distributed transaction scheme essentially encapsulates the local message table. The overall process is consistent with the local message table. The only difference is that the local message table is stored in MQ inst ...

@Override public void updateBrokerConfig(String brokerAddr, Properties properties) throws RemotingConnectException, RemotingSendRequestException, RemotingTimeoutException, UnsupportedEncodingException, InterruptedException, MQBrokerException { defaultMQAdminExtImpl.updateBrokerConfig(brokerAddr, properties); } @Override public ...

In this way, we have basically finished reading the Configuration class. This is a congestion model with a lot of content. Next, go back to NamesrvController. Under the Configuration class, the FileWatchService class is declared. From the outside, it should be a file reading service. Go in and have a look: org.apache.rocketmq.srvutil.File ...

preface Record RocketMQ Quickly build RocketMQ cluster Machine environment Prepare three machines, root password root; IP address: 192.168.232.128 worker1 192.168.232.129 worker2 192.168.232.130 worker3 Create user useradd oper passwd oper (Password entry 123 qweasd) system configuration Switch the oper user and generate a key ...

Rocketmq distributed transaction processing details I Related concepts Based on its message definition, RocketMQ extends two related concepts to transaction messages: 1. Half(Prepare) Message -- half message (preprocessed message) Semi message is a special message type. Messages in this state cannot be consumed by consumers temporarily. When ...

Article catalog Message queue RocketMQ: (I) overview Message queuing RocketMQ: (II) system architecture Message queue RocketMQ: (III) sending ordinary messages (three methods) Message queue RocketMQ: (IV) sequential messages Message queue RocketMQ: (V) delay message Message queue RocketMQ: (VII) batch messages premise Create a Maven J ...

Since Apache RocketMQ entered the vision of global developers in 2016, it has developed into the core data base of technology in e-commerce, finance, education, science and technology and other fields.According to incomplete statistics, more than 70% of domestic users (including top 100 enterprises in various fields such as finance, insurance, ...

1, Overview Distributed transaction messages are a unique feature of RocketMQ. In many scenarios, the strong consistency of transactions is not required, but only the final consistency of transactions. At this point, transaction messages can well meet the requirements. By putting the local transaction and message sending into one local tr ...