Dependent environment First need java support Download the 1.8 version of jdk After downloading, decompress, and declare JAVA_HOME in the environment variable After saving, use the source command to make the environment variable take effect Download the hadoop file In this post, we will be using version 2.10. Unzip to the directory you want to place in… Read More »
The current development situation in the technological world is to free developers from tedious application configuration and management, use container images to handle complex program operation-dependent library requirements, and ensure the consistency of the code operating environment. Since the benefits of this are so clear, why doesn’t the infrastructure environment in the enterprise switch to container clusters? The… Read More »
Background Pika is a persistent large-capacity redis storage service, compatible with most of the interfaces of string, hash, list, zset, and set (compatibility details), and solves the capacity bottleneck of redis that is insufficient due to the huge amount of stored data. Users can migrate from redis to pika service without modifying any code. It has good compatibility… Read More »
Queue-based and message-based TTL TTL is short for time to live, as the name implies refers to the time to live of the message. rabbitMq can set the message expiration time from two dimensions, namely the queue and the message itself.Queue message expiration time-Per-Queue Message TTL:Set the x-message-ttl parameter of the queue to set the message’s survival time… Read More »
Redis brief introduction Redis is a key-value database written in c language, open-source, and highly available non-relational database (NoSQL, not just database) type. Unlike traditional databases, Redis data exists in memory, so the read and write performance is not generally high, and can reach 100,000 operations per second, so it is widely used in the cache direction, for… Read More »
Client-side architecture The Client class has only one entry, which is the call() method. The proxy class will call the Client.call() method to send the RPC request to the remote server, and then wait for the response from the remote server. If an exception occurs when the remote server responds to the request, an exception is thrown in… Read More »
Generally, RPC is based on the C/S structure. The RPC server corresponds to the network server, and the RPC client corresponds to the network client. However, for some unique scenarios, such as providing an RPC service on the company’s intranet, but unable to connect to the intranet’s server on the external network. At this time, we can refer… Read More »
Introduction Access control is to provide a set of methods to identify, organize, and host all functions in the system, organize, and identify all data, and then offer a unique and straightforward interface. One end of this interface is the application. At one end of the system is the permission engine. The permission engine only answers: Does anyone… Read More »