专有网络VPC的视频简介和组成_专有网络 VPC-阿里云帮助中心 - https://help.aliyun.com/zh/vpc/product-overview/what-is-a-vpc switch vs router switch store mac address in a lookup table router store ip address in the routing table; forward data packet between computer networks NAT network address transalation snat: translate source ip dnat: translate destination ip ; 详解SLB、EIP、NAT网关之间区别， 合理选择云上公网入口 public ip eip (elastic ip):弹性ip nat (network address translation): nat网关 slb（server load balance) 底层都是都过nat实现 可用区 可用区：同一地区的不同的地方；电力和网络相互隔； 同一地域的不同可用区内网互联

后端 - Go defer 原理和源码剖析 - 个人文章 - SegmentFault 思否 - https://segmentfault.com/a/1190000040950441 The empty struct defer type form basic or not: basic: int, int8,int32 float32,float34 string composite type: container: array map slice pointer channel; struct; interface function value type and reference type. value type: store and pass: 值本身 对子字段(元素)修改不会影响原值 reference type: store and pass: 值的引用(pointer) value type: basic type Numeric types: int, int8, int16, int32, int64 uint, uint8, uint16, uint32, uint64, uintptr float32, float64 complex64, complex128 Boolean type: bool String type: string Array type: []T Struct type: struct{} reference type:

comparale; what？ use “==” to compare comparable: basic type channel: equal when same reference; arrays: if elements are comparable; struct: if fields are comparable; interface: if: dymanic types are comparable OR: panic,comparable uncomparable types; uncomparable: map; function slice how to compare funciton, slice, map; reflect.Deepequal slice equal when : all element == map: keys,values are ==; function: both nil defer what what？ a function will be called at last; feature? stack: FILO; how linked list node: {deferF *func,parameters interface{}}

Redis 系列（二）: 连集合底层实现原理都不知道，你敢说 Redis 用的很溜？ 压缩列表 数据库 Redis(2)——跳跃表 缓存系统稳定性 - 架构师峰会演讲实录 Redis专题：万字长文详解持久化原理 Bloom Filters - the math All About Bloom Filters Redis 6.0 新特性：带你 100% 掌握多线程模型 Redis进阶 - 高可用：哨兵机制（Redis Sentinel）详解 Redis Sentinel-深入浅出原理和实战 high performace 多线程? 提高数据处理速度: read,decode,write, 折中的master-worker,总体看还是单线程 mechanism basic structure dbList: bList:[redisDB1,redisDB2,…] store form: value dict: dict[stringRedisobj] = some redisObj expire dict: dict[strinngRedisObj] = expire time reids object: econding: underlying implement 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 typedef struct redisObject { // 类型 unsigned type:4; // 对齐位 unsigned notused:2; // 编码方式 unsigned encoding:4; // LRU 时间（相对于 server.

持续可用cap What is the CAP theorem? CAP Theorem 资深程序员实践经验：大白话讲解“什么是CAP定理？” What is the CAP Theorem? MongoDB vs Cassandra vs RDBMS, where do they stand in the CAP theorem? 00 开篇词 吃透分布式数据库，提升职场竞争力 https://draveness.me/consensus/ 共识、线性一致性与顺序一致性 分布式系统中的Linearizability一致性的概念介绍 「分布式计算」什么是严格一致性和最终一致性？ 「图解Raft」让一致性算法变得更简单 Raft算法详解 ETCD背后的Raft一致性算法原理 一文搞懂Raft算法 Raft 协议实战系列（六）—— 线性一致性与读性能优化 Introduction to the Raft algorithm The Raft Consensus Algorithm etcd教程(七)—读请求执行流程分析 Strong consistency models Consistency Models 分布式系统中的一致性模型`` CAP Theorem for Databases: Consistency, Availability & Partition Tolerance raft paper Making sense of the RAFT Distributed Consensus Algorithm — Part 1

what is cron cron is time based job scheduler in unix like system; it is base on local time zone; CRON 1 2 3 4 5 6 7 8 9 # ┌───────────── minute (0 - 59) # │ ┌───────────── hour (0 - 23) # │ │ ┌───────────── day of the month (1 - 31) # │ │ │ ┌───────────── month (1 - 12) # │ │ │ │ ┌───────────── day of the week (0 - 6) (Sunday to Saturday; # │ │ │ │ │ 7 is also Sunday on some systems) # │ │ │ │ │ # │ │ │ │ │ # * * * * * <command to execute>