Programming VIP

1 first come first out (FIFO) Invalidation algorithms are common in cache systems. Because the cache often occupies a large amount of memory, and the memory space is relatively expensive and the space is limited, some values should be invalidated or removed according to the corresponding algorithm. 1.1 general First In First Out. This ...

Partition cache Demand scenario Most data analysis scenarios write less and read more. The data is written once and read more frequently. For example, the dimensions and indicators involved in a report are calculated at one time in the early morning, but there are hundreds or even thousands of page accesses every day. Therefore, it is very su ...

Chapter 9 concurrency based on shared variables In the previous chapter, we used direct and natural methods such as goroutine and channel to implement concurrency. Sometimes they have some problems In this chapter, we will introduce the concurrency mechanism in more detail, especially the sharing of variables between goroutines. We will also ...

LRU caching mechanism 1. Title Original question link Using the data structure you have mastered, design and implement an LRU (least recently used) caching mechanism. It should support the following operations: get data and write data put. Get data (key) - if the keyword (key) exists in the cache, get the value of the keyword (always pos ...

catalogue 1, Introduction 2, Install and deploy go and codis 1. Download 2. Deploy go 3. codis environment installation and deployment 4. codis start (1) Start CODIS dashboard (2) Start CODIS proxy (3) Start CODIS server (4) Start CODIS Fe 3, Add group through fe 4, Initialize slot through fe 5, Cluster configuration 1. Add two Re ...

TabBarView is a Tab layout component provided in the Material component library. It is usually used with TabBar. TabBarView TabBarView encapsulates PageView, and its construction method is very simple TabBarView({ Key? key, required this.children, // tab page this.controller, // TabController this.physics, this.dragStartBehavior ...

1. redis lock classification The locking commands that redis can use are INCR, SETNX and SET 2. The first lock command INCR The idea of locking is that if the key does not exist, the value of the key will be initialized to 0 first, and then the INCR operation will be performed to add one.   Then, other users add one hour when executing t ...

In the last article, we talked about the construction of Redis cluster and the dynamic addition and deletion of nodes. Here we will briefly review. 30001 ~ 30006 are the clusters we built initially, and 30007 and 30008 are the master-slave nodes dynamically added later. We use the -- cluster info command to see the allocation of master nodes an ...

Redis Cluster is a Redis Cluster scheme launched by redis version 3.0. It distributes data in different service areas to reduce the system's dependence on a single master node and greatly improve the read-write performance of redis services. Redis divides all data into 16384 slots, and each node is responsible for a part of the slots. When a r ...

Chapter 6 using% File object If you want to manipulate the File itself, you need to use% library The% New() method of File instantiates the% File object. The class also provides instance methods that allow the File to be used. Note: this section provides several examples of using the% File object for illustration. For simple fil ...