Programmer Think

Preface Java 8 has been released for several years, but it has been found that many people still insist on using Simple Date Format and Date for time manipulation. The SimpleDateFormat class is not thread-safe and can cause fatal problems if it is ...

We know that kafka is based on TCP connections. It does not use netty as a TCP server like many middleware. Instead, I wrote a set based on Java NIO. Several Important Classes Look at Kafka Client's network architecture first.     This paper mainly analyses the Network layer. The Network layer has two important classes: Selector and Kaf ...

kafka cluster monitoring 1. Introduction to Kafka Offset Monitor Install and deploy Kafka Offset Monitor Install and deploy the kafka-mamager tool There are many Kafka cluster monitoring tools, and here we will only describe monitoring for Ka ...

1. Generating relevant SSL certificates Relevant knowledge points: Java SSL authentication: SSL (Secure Socket Layer Secure Socket Layer) and its successor Transport Layer Security (TLS) are security protocols that provide security and data integ ...

concept 1,group: There is only one instance consumption in the group. If no group is set, stream automatically creates anonymous and independent groups for each instance -- and each instance consumes them. There is only one instance consumed per group and load balancing is polled. Usually, when binding an application to a given target, it's ...

Synchronization, Asynchronization, Multithreading, Single Thread, Concurrent, Parallel Multi-threading (asynchronism) needs to solve synchronization problem, and single-threading (synchronization) needs to solve asynchronism problem. Parallel (without common resources, i.e. multiple CPUs, one CPU per ...

NGINX lua integrated kafka Step 1: Enter the opresty directory [root@node03 openresty]# cd /export/servers/openresty/ [root@node03 openresty]# ll total 356 drwxr-xr-x 2 root root 4096 Jul 26 11:33 bin drwxrwxr-x 44 1000 1000 4096 Jul 26 11:31 build drwxrwxr-x 43 1000 1000 4096 Nov 13 2017 bundle -rwxrwxr-x 1 1000 1000 45908 Nov 13 20 ...

Background: Recently, the company's three-node kafka cluster found that there are two nodes in the cutter box switch failure risk, will randomly appear port up/down situation. Therefore, it is necessary to temporarily migrate these two broker s, and then migrate back after the switch is repaired. Here is the whole process of the simulation (e ...

A Noun Interpretation of Kafka 1.topic Topic is equivalent to a queue in the MQ of a traditional messaging system. The message sent by the producer side must specify which topic to send to. In a large application system, different topics can be distinguished according to their functions (topic of order, topic of login, topic of amount, e ...

This paper records the design and implementation process of message queue with persistence function which I participated in Aliyun middleware competition a month ago. It should be noted that LocalMQ draws on the core design idea of RocketMQ in Broker. The earliest source code is also based on RocketMQ source code modification. This article cove ...