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Create branch ${ searchTerm }
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<!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width"><meta name="theme-color" content="#222"><meta name="generator" content="Hexo 6.3.0"><link rel="preconnect" href="https://fonts.googleapis.com" crossorigin><link rel="preconnect" href="https://cdnjs.cloudflare.com" crossorigin><link rel="apple-touch-icon" sizes="180x180" href="/images/apple-touch-icon-next.png"><link rel="icon" type="image/png" sizes="32x32" href="/images/favicon-32x32-next.png"><link rel="icon" type="image/png" sizes="16x16" href="/images/favicon-16x16-next.png"><link rel="mask-icon" href="/images/logo.svg" color="#222"><meta name="google-site-verification" content="2X6S9P7CAjXjVvw8YyQR8pCu-B0oEu7O9quLgxXuWyA"><meta name="baidu-site-verification" content="dV8JGNzi0c"><script>setTimeout(function(){var 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type="application/json">{"sidebar":"","isHome":true,"isPost":false,"lang":"zh-CN","comments":"","permalink":"","path":"page/35/index.html","title":""}</script><script class="next-config" data-name="calendar" type="application/json">""</script><title>Nicksxs's Blog - What hurts more, the pain of hard work or the pain of regret?</title><script async src="https://www.googletagmanager.com/gtag/js?id=UA-61358619-1"></script><script class="next-config" data-name="google_analytics" type="application/json">{"tracking_id":"UA-61358619-1","only_pageview":false}</script><script src="/js/third-party/analytics/google-analytics.js"></script><script src="/js/third-party/analytics/baidu-analytics.js"></script><script async src="https://hm.baidu.com/hm.js?20f33b3c0c0eff9b1522999c0015646d"></script><noscript><link rel="stylesheet" href="/css/noscript.css"></noscript><link rel="alternate" href="/atom.xml" title="Nicksxs's Blog" type="application/atom+xml"></head><body itemscope itemtype="http://schema.org/WebPage" class="use-motion"><div class="headband"></div><main class="main"><div class="column"><header class="header" itemscope itemtype="http://schema.org/WPHeader"><div class="site-brand-container"><div class="site-nav-toggle"><div class="toggle" aria-label="切换导航栏" role="button"><span class="toggle-line"></span> <span class="toggle-line"></span> <span class="toggle-line"></span></div></div><div class="site-meta"><a href="/" class="brand" rel="start"><i class="logo-line"></i><h1 class="site-title">Nicksxs's Blog</h1><i class="logo-line"></i></a><p class="site-subtitle" itemprop="description">What hurts more, the pain of hard work or the pain of regret?</p></div><div class="site-nav-right"><div class="toggle popup-trigger" aria-label="搜索" role="button"><i class="fa fa-search fa-fw fa-lg"></i></div></div></div><nav class="site-nav"><ul class="main-menu menu"><li class="menu-item menu-item-home"><a href="/" rel="section"><i class="fa fa-home 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class="search-pop-overlay"><div class="popup search-popup"><div class="search-header"><span class="search-icon"><i class="fa fa-search"></i></span><div class="search-input-container"><input autocomplete="off" autocapitalize="off" maxlength="80" placeholder="搜索..." spellcheck="false" type="search" class="search-input"></div><span class="popup-btn-close" role="button"><i class="fa fa-times-circle"></i></span></div><div class="search-result-container no-result"><div class="search-result-icon"><i class="fa fa-spinner fa-pulse fa-5x"></i></div></div></div></div></header><aside class="sidebar"><div class="sidebar-inner sidebar-overview-active"><ul class="sidebar-nav"><li class="sidebar-nav-toc">文章目录</li><li class="sidebar-nav-overview">站点概览</li></ul><div class="sidebar-panel-container"><div class="post-toc-wrap sidebar-panel"></div><div class="site-overview-wrap sidebar-panel"><div class="site-author animated" itemprop="author" itemscope itemtype="http://schema.org/Person"><img class="site-author-image" itemprop="image" alt="Nicksxs" src="/uploads/avatar.jpg"><p class="site-author-name" itemprop="name">Nicksxs</p><div class="site-description" itemprop="description">learn from zero,技术博客，Nicksxs，史学森</div></div><div class="site-state-wrap animated"><nav class="site-state"><div class="site-state-item site-state-posts"><a href="/archives/"><span class="site-state-item-count">194</span> <span class="site-state-item-name">日志</span></a></div><div class="site-state-item site-state-categories"><a href="/categories/"><span class="site-state-item-count">148</span> <span class="site-state-item-name">分类</span></a></div><div class="site-state-item site-state-tags"><a href="/tags/"><span class="site-state-item-count">287</span> <span class="site-state-item-name">标签</span></a></div></nav></div><div class="links-of-author animated"><span class="links-of-author-item"><a href="https://github.com/nicksxs" title="GitHub → https:&#x2F;&#x2F;github.com&#x2F;nicksxs" rel="noopener me" target="_blank"><i class="fab fa-github fa-fw"></i>GitHub</a> </span><span class="links-of-author-item"><a href="mailto:nicksxs1202@gmail.com" title="E-Mail → mailto:nicksxs1202@gmail.com" rel="noopener me" target="_blank"><i class="fa fa-envelope fa-fw"></i>E-Mail</a></span></div><div class="cc-license animated" itemprop="license"><a href="https://creativecommons.org/licenses/by-nc-sa/4.0/" class="cc-opacity" rel="noopener" target="_blank"><img src="https://cdnjs.cloudflare.com/ajax/libs/creativecommons-vocabulary/2020.11.3/assets/license_badges/small/by_nc_sa.svg" alt="Creative Commons"></a></div><script charset="utf-8" src="/js/tagcloud.js"></script><script charset="utf-8" src="/js/tagcanvas.js"></script><div class="widget-wrap"><div id="myCanvasContainer" class="widget tagcloud"><canvas width="250" height="250" id="resCanvas"><ul class="tag-list" itemprop="keywords"><li class="tag-list-item"><a class="tag-list-link" href="/tags/2019/" rel="tag">2019</a><span 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href="/tags/EagerThreadPool/" rel="tag">EagerThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Evict/" rel="tag">Evict</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Filter/" rel="tag">Filter</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/First-Bad-Version/" rel="tag">First Bad Version</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/FixedThreadPool/" rel="tag">FixedThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/G1/" rel="tag">G1</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/GC/" rel="tag">GC</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Garbage-First-Collector/" rel="tag">Garbage-First Collector</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Gogs/" rel="tag">Gogs</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Homebrew/" rel="tag">Homebrew</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Inorder-Traversal/" rel="tag">Inorder Traversal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Interceptor/" rel="tag">Interceptor</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Intersection-of-Two-Arrays/" rel="tag">Intersection of Two Arrays</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/JMap/" rel="tag">JMap</a><span class="tag-list-count">1</span></li><li 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rel="tag">Shift 2D Grid</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Singleton/" rel="tag">Singleton</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Spring/" rel="tag">Spring</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Spring-Event/" rel="tag">Spring Event</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/SpringBoot/" rel="tag">SpringBoot</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Sql%E6%B3%A8%E5%85%A5/" rel="tag">Sql注入</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Stream/" rel="tag">Stream</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Synchronized/" rel="tag">Synchronized</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Thread-dump/" rel="tag">Thread dump</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/ThreadLocal/" rel="tag">ThreadLocal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/ThreadPool/" rel="tag">ThreadPool</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Tomcat/" rel="tag">Tomcat</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Trapping-Rain-Water/" rel="tag">Trapping Rain Water</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/WeakReference/" rel="tag">WeakReference</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Web/" rel="tag">Web</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/Webhook/" rel="tag">Webhook</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/WordPress/" rel="tag">WordPress</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/aqs/" rel="tag">aqs</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/await/" rel="tag">await</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/bloom-filter/" rel="tag">bloom filter</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/c/" rel="tag">c++</a><span class="tag-list-count">14</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/cglib/" rel="tag">cglib</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/cgroup/" rel="tag">cgroup</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/cluster/" rel="tag">cluster</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/condition/" rel="tag">condition</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/docker/" rel="tag">docker</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/dp/" rel="tag">dp</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/dubbo/" rel="tag">dubbo</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/echo/" rel="tag">echo</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/environment/" rel="tag">environment</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gap-lock/" rel="tag">gap lock</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/gc/" rel="tag">gc</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/git/" rel="tag">git</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/grep/" rel="tag">grep</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/hadoop/" rel="tag">hadoop</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/icu4c/" rel="tag">icu4c</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/im/" rel="tag">im</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/is-not-null/" rel="tag">is not null</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/is-null/" rel="tag">is null</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/j-u-c/" rel="tag">j.u.c</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/java/" rel="tag">java</a><span class="tag-list-count">33</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/jvm/" rel="tag">jvm</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/leetcode/" rel="tag">leetcode</a><span class="tag-list-count">40</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/leetcode-155/" rel="tag">leetcode 155</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/linked-list/" rel="tag">linked list</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/linux/" rel="tag">linux</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/lock/" rel="tag">lock</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mfc/" rel="tag">mfc</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/min-stack/" rel="tag">min stack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mq/" rel="tag">mq</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mvcc/" rel="tag">mvcc</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/mysql/" rel="tag">mysql</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/namespace/" rel="tag">namespace</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/next-key-lock/" rel="tag">next-key lock</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nginx/" rel="tag">nginx</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/nullsfirst/" rel="tag">nullsfirst</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/openresty/" rel="tag">openresty</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/php/" rel="tag">php</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/powershell/" rel="tag">powershell</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/procedure/" rel="tag">procedure</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/python/" rel="tag">python</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/read-view/" rel="tag">read view</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/redis/" rel="tag">redis</a><span class="tag-list-count">12</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/scp/" rel="tag">scp</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/signal/" rel="tag">signal</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/sort/" rel="tag">sort</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/spark/" rel="tag">spark</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/ssh/" rel="tag">ssh</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/stack/" rel="tag">stack</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/stream/" rel="tag">stream</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/string/" rel="tag">string</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/swoole/" rel="tag">swoole</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/top/" rel="tag">top</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/uname/" rel="tag">uname</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/unlock/" rel="tag">unlock</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8/" rel="tag">utf8</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4/" rel="tag">utf8mb4</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4-0900-ai-ci/" rel="tag">utf8mb4_0900_ai_ci</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4-general-ci/" rel="tag">utf8mb4_general_ci</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/utf8mb4-unicode-ci/" rel="tag">utf8mb4_unicode_ci</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/value/" rel="tag">value</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/websocket/" rel="tag">websocket</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/zookeeper/" rel="tag">zookeeper</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/zsh/" rel="tag">zsh</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%89%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/" rel="tag">三阶段提交</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%8D%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/" rel="tag">不可变引用</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%9C%E4%BA%AC%E5%A5%A5%E8%BF%90%E4%BC%9A/" rel="tag">东京奥运会</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%A4%E9%98%B6%E6%AE%B5%E6%8F%90%E4%BA%A4/" rel="tag">两阶段提交</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E5%B1%B1%E8%B7%AF/" rel="tag">中山路</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E5%BA%8F/" rel="tag">中序</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%AD%E9%97%B4%E4%BB%B6/" rel="tag">中间件</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B8%BE%E9%87%8D/" rel="tag">举重</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%B9%92%E4%B9%93%E7%90%83/" rel="tag">乒乓球</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%8B%E5%8A%A1/" rel="tag">事务</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%8C%E5%8F%89%E6%A0%91/" rel="tag">二叉树</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BA%92%E6%96%A5%E9%94%81/" rel="tag">互斥锁</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BB%A3%E7%A0%81%E9%A2%98%E8%A7%A3/" rel="tag">代码题解</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E4%BF%AE%E7%94%B5%E8%84%91%E7%9A%84/" rel="tag">修电脑的</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%81%8F%E5%90%91%E9%94%81/" rel="tag">偏向锁</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%81%A5%E5%BA%B7%E7%A0%81/" rel="tag">健康码</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%85%AC%E4%BA%A4/" rel="tag">公交</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%85%AC%E4%BA%A4%E8%BD%A6/" rel="tag">公交车</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%86%85%E5%AD%98%E5%88%86%E5%B8%83/" rel="tag">内存分布</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%86%85%E5%AD%98%E6%B3%84%E6%BC%8F/" rel="tag">内存泄漏</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%87%86%E5%A4%87/" rel="tag">准备</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%87%8F%E8%82%A5/" rel="tag">减肥</a><span class="tag-list-count">6</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E4%BA%8B%E5%8A%A1/" rel="tag">分布式事务</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%86%E5%B8%83%E5%BC%8F%E9%94%81/" rel="tag">分布式锁</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%87%E7%89%87/" rel="tag">切片</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%88%9D%E5%A7%8B%E5%8C%96/" rel="tag">初始化</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8A%E5%B3%B0%E5%A1%AB%E8%B0%B7/" rel="tag">削峰填谷</a><span class="tag-list-count">4</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%89%8D%E5%BA%8F/" rel="tag">前序</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8A%A0%E5%A1%9E/" rel="tag">加塞</a><span class="tag-list-count">3</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8A%A0%E8%BD%BD/" rel="tag">加载</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8D%95%E4%BE%8B/" rel="tag">单例</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8D%9A%E5%AE%A2%EF%BC%8C%E6%96%87%E7%AB%A0/" rel="tag">博客，文章</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8E%A6%E9%97%A8/" rel="tag">厦门</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%8C%E4%BA%B2%E5%A7%94%E6%B4%BE/" rel="tag">双亲委派</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%91%E8%A1%8C%E7%89%88/" rel="tag">发行版</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%A3%E7%BD%A9/" rel="tag">口罩</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%8F%AF%E5%8F%98%E5%BC%95%E7%94%A8/" rel="tag">可变引用</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%90%90%E6%A7%BD/" rel="tag">吐槽</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9B%A4%E7%89%A9%E8%B5%84/" rel="tag">囤物资</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6/" rel="tag">垃圾回收</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%9F%BA%E7%A1%80%E8%AE%BE%E6%96%BD/" rel="tag">基础设施</a><span class="tag-list-count">2</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%A4%A7%E6%89%AB%E9%99%A4/" rel="tag">大扫除</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AD%97%E7%AC%A6%E9%9B%86/" rel="tag">字符集</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AE%89%E5%85%A8/" rel="tag">安全</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AE%B9%E9%94%99%E6%9C%BA%E5%88%B6/" rel="tag">容错机制</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%AF%84%E7%94%9F%E8%99%AB/" rel="tag">寄生虫</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B0%84%E5%87%BB/" rel="tag">射击</a><span class="tag-list-count">1</span></li><li class="tag-list-item"><a class="tag-list-link" href="/tags/%E5%B0%8F%E6%8A%80%E5%B7%A7/" rel="tag">小技巧</a><span class="tag-list-count">5</span></li><li class="tag-list-item"><a class="tag-list-link" 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itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2019/09/23/AbstractQueuedSynchronizer/" class="post-title-link" itemprop="url">AbstractQueuedSynchronizer</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2019-09-23 23:40:05" itemprop="dateCreated datePublished" datetime="2019-09-23T23:40:05+08:00">2019-09-23</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar-check"></i> </span><span class="post-meta-item-text">更新于</span> <time title="修改时间：2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/java/" itemprop="url" rel="index"><span itemprop="name">java</span></a> </span></span><span id="/2019/09/23/AbstractQueuedSynchronizer/" class="post-meta-item leancloud_visitors" data-flag-title="AbstractQueuedSynchronizer" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2019/09/23/AbstractQueuedSynchronizer/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/09/23/AbstractQueuedSynchronizer/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>最近看了大神的 AQS 的文章，之前总是断断续续地看一点，每次都知难而退，下次看又从头开始，昨天总算硬着头皮看完了第一部分<br>首先 AQS 只要有这些属性</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 头结点，你直接把它当做 当前持有锁的线程 可能是最好理解的</span>
<span class="token keyword">private</span> <span class="token keyword">transient</span> <span class="token keyword">volatile</span> <span class="token class-name">Node</span> head<span class="token punctuation">;</span>
<span class="token comment">// 阻塞的尾节点，每个新的节点进来，都插入到最后，也就形成了一个链表</span>
<span class="token keyword">private</span> <span class="token keyword">transient</span> <span class="token keyword">volatile</span> <span class="token class-name">Node</span> tail<span class="token punctuation">;</span>
<span class="token comment">// 这个是最重要的，代表当前锁的状态，0代表没有被占用，大于 0 代表有线程持有当前锁</span>
<span class="token comment">// 这个值可以大于 1，是因为锁可以重入，每次重入都加上 1</span>
<span class="token keyword">private</span> <span class="token keyword">volatile</span> <span class="token keyword">int</span> state<span class="token punctuation">;</span>
<span class="token comment">// 代表当前持有独占锁的线程，举个最重要的使用例子，因为锁可以重入</span>
<span class="token comment">// reentrantLock.lock()可以嵌套调用多次，所以每次用这个来判断当前线程是否已经拥有了锁</span>
<span class="token comment">// if (currentThread == getExclusiveOwnerThread()) &#123;state++&#125;</span>
<span class="token keyword">private</span> <span class="token keyword">transient</span> <span class="token class-name">Thread</span> exclusiveOwnerThread<span class="token punctuation">;</span> <span class="token comment">//继承自AbstractOwnableSynchronizer</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>大概了解了 aqs 底层的双向等待队列，<br>结构是这样的<br><img data-src="https://tva1.sinaimg.cn/large/006tNbRwly1g9mxu0ndt1j319o08w0t7.jpg"><br>每个 node 里面主要是的代码结构也比较简单</p><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token keyword">class</span> <span class="token class-name">Node</span> <span class="token punctuation">&#123;</span>
<span class="token comment">// 标识节点当前在共享模式下</span>
<span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token class-name">Node</span> <span class="token constant">SHARED</span> <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Node</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 标识节点当前在独占模式下</span>
<span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token class-name">Node</span> <span class="token constant">EXCLUSIVE</span> <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
<span class="token comment">// ======== 下面的几个int常量是给waitStatus用的 ===========</span>
<span class="token comment">/** waitStatus value to indicate thread has cancelled */</span>
<span class="token comment">// 代码此线程取消了争抢这个锁</span>
<span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token keyword">int</span> <span class="token constant">CANCELLED</span> <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span>
<span class="token comment">/** waitStatus value to indicate successor's thread needs unparking */</span>
<span class="token comment">// 官方的描述是，其表示当前node的后继节点对应的线程需要被唤醒</span>
<span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token keyword">int</span> <span class="token constant">SIGNAL</span> <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>
<span class="token comment">/** waitStatus value to indicate thread is waiting on condition */</span>
<span class="token comment">// 本文不分析condition，所以略过吧，下一篇文章会介绍这个</span>
<span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token keyword">int</span> <span class="token constant">CONDITION</span> <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">2</span><span class="token punctuation">;</span>
<span class="token comment">/**
* waitStatus value to indicate the next acquireShared should
* unconditionally propagate
*/</span>
<span class="token comment">// 同样的不分析，略过吧</span>
<span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token keyword">int</span> <span class="token constant">PROPAGATE</span> <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">3</span><span class="token punctuation">;</span>
<span class="token comment">// =====================================================</span>
<span class="token comment">// 取值为上面的1、-1、-2、-3，或者0(以后会讲到)</span>
<span class="token comment">// 这么理解，暂时只需要知道如果这个值 大于0 代表此线程取消了等待，</span>
<span class="token comment">// ps: 半天抢不到锁，不抢了，ReentrantLock是可以指定timeouot的。。。</span>
<span class="token keyword">volatile</span> <span class="token keyword">int</span> waitStatus<span class="token punctuation">;</span>
<span class="token comment">// 前驱节点的引用</span>
<span class="token keyword">volatile</span> <span class="token class-name">Node</span> prev<span class="token punctuation">;</span>
<span class="token comment">// 后继节点的引用</span>
<span class="token keyword">volatile</span> <span class="token class-name">Node</span> next<span class="token punctuation">;</span>
<span class="token comment">// 这个就是线程本尊</span>
<span class="token keyword">volatile</span> <span class="token class-name">Thread</span> thread<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>其实可以主要关注这个 <code>waitStatus</code> 因为这个是后面的节点给前面的节点设置的，等于-1 的时候代表后面有节点等待，需要去唤醒，<br>这里使用了一个变种的 CLH 队列实现，CLH 队列相关内容可以查看这篇 <a target="_blank" rel="noopener" href="https://coderbee.net/index.php/concurrent/20131115/577">自旋锁、排队自旋锁、MCS锁、CLH锁</a></p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2019/06/18/openresty/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2019/06/18/openresty/" class="post-title-link" itemprop="url">openresty</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2019-06-18 19:03:05" itemprop="dateCreated datePublished" datetime="2019-06-18T19:03:05+08:00">2019-06-18</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar-check"></i> </span><span class="post-meta-item-text">更新于</span> <time title="修改时间：2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/nginx/" itemprop="url" rel="index"><span itemprop="name">nginx</span></a> </span></span><span id="/2019/06/18/openresty/" class="post-meta-item leancloud_visitors" data-flag-title="openresty" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2019/06/18/openresty/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2019/06/18/openresty/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><p>目前公司要对一些新的产品功能做灰度测试，因为在后端业务代码层面添加判断比较麻烦，所以想在nginx上做点手脚，就想到了openresty<br>前后也踩了不少坑，这边先写一点</p><p>首先是日志<br><code>error_log logs/error.log debug;</code><br>需要nginx开启日志的debug才能看到日志</p><p>使用 <code>lua_code_cache off</code>即可, 另外注意只有使用 <code>content_by_lua_file</code> 才会生效</p><pre class="line-numbers language-lua" data-language="lua"><code class="language-lua"><span class="token function">http</span> <span class="token punctuation">&#123;</span>
lua_code_cache off<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
location <span class="token operator">~</span><span class="token operator">*</span> <span class="token operator">/</span><span class="token punctuation">(</span>\d<span class="token operator">+</span><span class="token operator">-</span><span class="token punctuation">.</span><span class="token operator">*</span><span class="token punctuation">)</span><span class="token operator">/</span>api<span class="token operator">/</span>orgunits<span class="token operator">/</span><span class="token function">load_all</span><span class="token punctuation">(</span><span class="token punctuation">.</span><span class="token operator">*</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
default_type <span class="token string">'application/json;charset=utf-8'</span><span class="token punctuation">;</span>
content_by_lua_file <span class="token operator">/</span>data<span class="token operator">/</span>projects<span class="token operator">/</span>xxx<span class="token operator">/</span>current<span class="token operator">/</span>lua<span class="token operator">/</span>controller<span class="token operator">/</span>load_data<span class="token punctuation">.</span>lua<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>使用lua给nginx请求response头添加内容可以用这个</p><pre class="line-numbers language-lua" data-language="lua"><code class="language-lua">ngx<span class="token punctuation">.</span>header<span class="token punctuation">[</span><span class="token string">'response'</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token string">'header'</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre><p><a target="_blank" rel="noopener" href="http://cyukang.com/2017/05/22/try-on-openresty.html">使用总结</a></p><p>后续：</p><ol><li><p>一开始在本地环境的时候使用content_by_lua_file只关注了头，后来发到测试环境发现请求内容都没代理转发到后端服务上<br>网上查了下发现content_by_lua_file是将请求的所有内容包括response都用这里面的lua脚本生成了，content这个词就表示是请求内容<br>后来改成了access_by_lua_file就正常了，只是要去获取请求内容和修改响应头，并不是要完整的接管请求</p></li><li><p>后来又碰到了一个坑是nginx有个client_body_buffer_size的配置参数，nginx在32位和64位系统里有8K和16K两个默认值，当请求内容大于这两个值的时候，会把请求内容放到临时文件里，这个时候openresty里的ngx.req.get_post_args()就会报“failed to get post args: requesty body in temp file not supported”这个错误，将client_body_buffer_size这个参数配置调大一点就好了</p></li><li><p>还有就是lua的异常捕获，网上看一般是用pcall和xpcall来进行保护调用，因为问题主要出在cjson的decode，这里有两个解决方案，一个就是将cjson.decode使用pcall封装，</p><pre class="line-numbers language-lua" data-language="lua"><code class="language-lua"><span class="token keyword">local</span> decode <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"cjson"</span><span class="token punctuation">)</span><span class="token punctuation">.</span>decode
<span class="token keyword">function</span> <span class="token function">json_decode</span><span class="token punctuation">(</span> str <span class="token punctuation">)</span>
<span class="token keyword">local</span> ok<span class="token punctuation">,</span> t <span class="token operator">=</span> <span class="token function">pcall</span><span class="token punctuation">(</span>decode<span class="token punctuation">,</span> str<span class="token punctuation">)</span>
<span class="token keyword">if</span> <span class="token keyword">not</span> ok <span class="token keyword">then</span>
<span class="token keyword">return</span> <span class="token keyword">nil</span>
<span class="token keyword">end</span>
<span class="token keyword">return</span> t
<span class="token keyword">end</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>这个是使用了pcall，称为保护调用，会在内部错误后返回两个参数，第一个是false，第二个是错误信息<br>还有一种是使用cjson.safe包</p><pre class="line-numbers language-lua" data-language="lua"><code class="language-lua"><span class="token keyword">local</span> json <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"cjson.safe"</span><span class="token punctuation">)</span>
<span class="token keyword">local</span> str <span class="token operator">=</span> <span class="token string">[[ &#123;"key:"value"&#125; ]]</span>
<span class="token keyword">local</span> t <span class="token operator">=</span> json<span class="token punctuation">.</span><span class="token function">decode</span><span class="token punctuation">(</span>str<span class="token punctuation">)</span>
<span class="token keyword">if</span> t <span class="token keyword">then</span>
ngx<span class="token punctuation">.</span><span class="token function">say</span><span class="token punctuation">(</span><span class="token string">" --> "</span><span class="token punctuation">,</span> <span class="token function">type</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span><span class="token punctuation">)</span>
<span class="token keyword">end</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>cjson.safe包会在解析失败的时候返回nil</p></li><li><p>还有一个是redis链接时如果host使用的是域名的话会提示“failed to connect: no resolver defined to resolve “redis.xxxxxx.com””，这里需要使用nginx的resolver指令，<br><code>resolver 8.8.8.8 valid=3600s;</code></p></li><li><p>还有一点补充下<br>就是业务在使用redis的时候使用了db的特性，所以在lua访问redis的时候也需要执行db，这里lua的redis库也支持了这个特性，可以使用instance:select(config:get(‘db’))来切换db</p></li><li><p>性能优化tips<br><a target="_blank" rel="noopener" href="https://juejin.im/entry/5b0e8fcef265da09210072a3#openresty">建议是尽量少使用阶段钩子，例如content_by_lua_file，*_by_lua</a></p></li><li><p>发现一个不错的openresty站点<br><a target="_blank" rel="noopener" href="http://orhub.org/">地址</a></p></li></ol></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2017/05/09/ambari-summary/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2017/05/09/ambari-summary/" class="post-title-link" itemprop="url">ambari-summary</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2017-05-09 23:53:05" itemprop="dateCreated datePublished" datetime="2017-05-09T23:53:05+08:00">2017-05-09</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar-check"></i> </span><span class="post-meta-item-text">更新于</span> <time title="修改时间：2020-01-12 21:08:27" itemprop="dateModified" datetime="2020-01-12T21:08:27+08:00">2020-01-12</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/data-analysis/" itemprop="url" rel="index"><span itemprop="name">data analysis</span></a> </span></span><span id="/2017/05/09/ambari-summary/" class="post-meta-item leancloud_visitors" data-flag-title="ambari-summary" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2017/05/09/ambari-summary/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2017/05/09/ambari-summary/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><h2 id="初识ambari"><a href="#初识ambari" class="headerlink" title="初识ambari"></a>初识ambari</h2><p><a target="_blank" rel="noopener" href="http://ambari.apache.org/">ambari</a>是一个大数据平台的管理工具，包含了<code>hadoop</code>, <code>yarn</code>, <code>hive</code>, <code>hbase</code>, <code>spark</code>等大数据的基础架构和工具，简化了数据平台的搭建，之前只是在同事搭建好平台后的一些使用，这次有机会从头开始用<code>ambari</code>来搭建一个测试的数据平台，过程中也踩到不少坑，简单记录下。</p><h2 id="简单过程"><a href="#简单过程" class="headerlink" title="简单过程"></a>简单过程</h2><ul><li>第一个坑<br>在刚开始是按照官网的指南，用maven构建，因为GFW的原因，导致反复失败等待，也就是这个<a target="_blank" rel="noopener" href="https://cwiki.apache.org/confluence/display/AMBARI/Installation+Guide+for+Ambari+2.5.0">guide</a>，因为对maven不熟悉导致有些按图索骥，浪费了很多时间，之后才知道可以直接加repo用yum安装，然而用yum安装马上就出现了第二个坑。</li><li>第二个坑<br>因为在线的repo还是因为网络原因很慢很慢，用proxychains勉强把ambari-server本身安装好了，<a target="_blank" rel="noopener" href="http://public-repo-1.hortonworks.com/ambari/centos7/2.x/updates/2.5.0.3/ambari.repo">ambari.repo</a>将这个放进<code>/etc/yum.repos.d/</code>路径下，然后<code>yum update &amp;&amp; yum install ambari-server</code>安装即可，如果有条件就用proxychains走下代理。</li><li>第三步<br>安装好ambari-server后先执行<code>ambari-server setup</code>做一些初始化设置，其中包含了JDK路径的设置，数据库设置，设置好就OK了，然后执行<code>ambari-server start</code>启动服务，这里有个小插曲，因为<code>ambari-server</code>涉及到这么多服务，所以管理控制监控之类的模块是必不可少的，这部分可以在<code>ambari-server</code>的web ui界面安装，也可以命令行提前安装，这部分被称为<code>HDF Management Pack</code>，运行<code>ambari-server install-mpack \ --mpack=http://public-repo-1.hortonworks.com/HDF/centos7/2.x/updates/2.1.4.0/tars/hdf_ambari_mp/hdf-ambari-mpack-2.1.4.0-5.tar.gz \ --purge \ --verbose</code><br>安装，当然这个压缩包可以下载之后指到本地路径安装，然后就可以重启<code>ambari-server</code></li></ul></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2017/04/25/rabbitmq-tips/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2017/04/25/rabbitmq-tips/" class="post-title-link" itemprop="url">rabbitmq-tips</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2017-04-25 21:46:55" itemprop="dateCreated datePublished" datetime="2017-04-25T21:46:55+08:00">2017-04-25</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar-check"></i> </span><span class="post-meta-item-text">更新于</span> <time title="修改时间：2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/php/" itemprop="url" rel="index"><span itemprop="name">php</span></a> </span></span><span id="/2017/04/25/rabbitmq-tips/" class="post-meta-item leancloud_visitors" data-flag-title="rabbitmq-tips" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2017/04/25/rabbitmq-tips/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2017/04/25/rabbitmq-tips/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><h2 id="rabbitmq-介绍"><a href="#rabbitmq-介绍" class="headerlink" title="rabbitmq 介绍"></a>rabbitmq 介绍</h2><p>接触了一下rabbitmq，原来在选型的时候是在rabbitmq跟kafka之间做选择，网上搜了一下之后发现kafka的优势在于吞吐量，而rabbitmq相对注重可靠性，因为应用在im上，需要保证消息不能丢失所以就暂时选定rabbitmq，<br>Message Queue的需求由来已久，80年代最早在金融交易中，高盛等公司采用Teknekron公司的产品，当时的Message queuing软件叫做：the information bus（TIB）。 TIB被电信和通讯公司采用，路透社收购了Teknekron公司。之后，IBM开发了MQSeries，微软开发了Microsoft Message Queue（MSMQ）。这些商业MQ供应商的问题是厂商锁定，价格高昂。2001年，Java Message queuing试图解决锁定和交互性的问题，但对应用来说反而更加麻烦了。<br>RabbitMQ采用Erlang语言开发。Erlang语言由Ericson设计，专门为开发concurrent和distribution系统的一种语言，在电信领域使用广泛。OTP（Open Telecom Platform）作为Erlang语言的一部分，包含了很多基于Erlang开发的中间件／库／工具，如mnesia／SASL，极大方便了Erlang应用的开发。OTP就类似于Python语言中众多的module，用户借助这些module可以很方便的开发应用。<br>于是2004年，摩根大通和iMatrix开始着手<a target="_blank" rel="noopener" href="https://en.wikipedia.org/wiki/Advanced_Message_Queuing_Protocol">Advanced Message Queuing Protocol （AMQP）</a>开放标准的开发。2006年，AMQP规范发布。2007年，Rabbit技术公司基于AMQP标准开发的RabbitMQ 1.0 发布。所有主要的编程语言均有与代理接口通讯的客户端库。</p><h2 id="简单的使用经验"><a href="#简单的使用经验" class="headerlink" title="简单的使用经验"></a>简单的使用经验</h2><h3 id="通俗的理解"><a href="#通俗的理解" class="headerlink" title="通俗的理解"></a>通俗的理解</h3><p>这里介绍下其中的一些概念，connection表示和队列服务器的连接，一般情况下是tcp连接， channel表示通道，可以在一个连接上建立多个通道，这里主要是节省了tcp连接握手的成本，exchange可以理解成一个路由器，将消息推送给对应的队列queue，其实是像一个订阅的模式。</p><h3 id="集群经验"><a href="#集群经验" class="headerlink" title="集群经验"></a>集群经验</h3><p><code>rabbitmqctl stop</code>这个是关闭rabbitmq，在搭建集群时候先关闭服务，然后使用<code>rabbitmq-server -detached</code>静默启动，这时候使用<code>rabbitmqctl cluster_status</code>查看集群状态，因为还没将节点加入集群，所以只能看到类似</p><pre class="line-numbers language-bash" data-language="bash"><code class="language-bash">Cluster status of <span class="token function">node</span> rabbit@rabbit1 <span class="token punctuation">..</span>.
<span class="token punctuation">[</span><span class="token punctuation">&#123;</span>nodes,<span class="token punctuation">[</span><span class="token punctuation">&#123;</span>disc,<span class="token punctuation">[</span>rabbit@rabbit1,rabbit@rabbit2,rabbit@rabbit3<span class="token punctuation">]</span><span class="token punctuation">&#125;</span><span class="token punctuation">]</span><span class="token punctuation">&#125;</span>,
<span class="token punctuation">&#123;</span>running_nodes,<span class="token punctuation">[</span>rabbit@rabbit2,rabbit@rabbit1<span class="token punctuation">]</span><span class="token punctuation">&#125;</span><span class="token punctuation">]</span>
<span class="token punctuation">..</span>.done.<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre><p>然后就可以把当前节点加入集群，</p><pre class="line-numbers language-bash" data-language="bash"><code class="language-bash">rabbit2$ rabbitmqctl stop_app <span class="token comment">#这个stop_app与stop的区别是前者停的是rabbitmq应用，保留erlang节点，</span>
<span class="token comment">#后者是停止了rabbitmq和erlang节点</span>
Stopping <span class="token function">node</span> rabbit@rabbit2 <span class="token punctuation">..</span>.done.
rabbit2$ rabbitmqctl join_cluster rabbit@rabbit1 <span class="token comment">#这里可以用--ram指定将当前节点作为内存节点加入集群</span>
Clustering <span class="token function">node</span> rabbit@rabbit2 with <span class="token punctuation">[</span>rabbit@rabbit1<span class="token punctuation">]</span> <span class="token punctuation">..</span>.done.
rabbit2$ rabbitmqctl start_app
Starting <span class="token function">node</span> rabbit@rabbit2 <span class="token punctuation">..</span>.done.<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre><p>其他可以参考<a target="_blank" rel="noopener" href="http://www.rabbitmq.com/clustering.html">官方文档</a></p><h2 id="一些坑"><a href="#一些坑" class="headerlink" title="一些坑"></a>一些坑</h2><h3 id="消息丢失"><a href="#消息丢失" class="headerlink" title="消息丢失"></a>消息丢失</h3><p>这里碰到过一个坑，对于使用exchange来做消息路由的，会有一个情况，就是在routing_key没被订阅的时候，会将该条找不到路由对应的queue的消息丢掉<code>What happens if we break our contract and send a message with one or four words, like &quot;orange&quot; or &quot;quick.orange.male.rabbit&quot;? Well, these messages won&#39;t match any bindings and will be lost.</code><a target="_blank" rel="noopener" href="http://www.rabbitmq.com/tutorials/tutorial-five-python.html">对应链接</a>,而当使用空的exchange时，会保留消息，当出现消费者的时候就可以将收到之前生产者所推送的消息<a target="_blank" rel="noopener" href="http://www.rabbitmq.com/tutorials/tutorial-two-python.html">对应链接</a>,这里就是用了空的exchange。</p><h3 id="集群搭建"><a href="#集群搭建" class="headerlink" title="集群搭建"></a>集群搭建</h3><p>集群搭建的时候有个erlang vm生成的random cookie，这个是用来做集群之间认证的，相同的cookie才能连接，但是如果通过vim打开复制后在其他几点新建文件写入会多一个换行，导致集群建立是报错，所以这里最好使用scp等传输命令直接传输cookie文件，同时要注意下cookie的文件权限。<br>另外在集群搭建的时候如果更改过hostname，那么要把rabbitmq的数据库删除，否则启动后会马上挂掉</p></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><div class="post-block"><article itemscope itemtype="http://schema.org/Article" class="post-content"><link itemprop="mainEntityOfPage" href="https://nicksxs.me/2017/03/28/spark-little-tips/"><span hidden itemprop="author" itemscope itemtype="http://schema.org/Person"><meta itemprop="image" content="/uploads/avatar.jpg"><meta itemprop="name" content="Nicksxs"></span><span hidden itemprop="publisher" itemscope itemtype="http://schema.org/Organization"><meta itemprop="name" content="Nicksxs's Blog"><meta itemprop="description" content="learn from zero,技术博客，Nicksxs，史学森"></span><span hidden itemprop="post" itemscope itemtype="http://schema.org/CreativeWork"><meta itemprop="name" content="undefined | Nicksxs's Blog"><meta itemprop="description" content=""></span><header class="post-header"><h2 class="post-title" itemprop="name headline"><a href="/2017/03/28/spark-little-tips/" class="post-title-link" itemprop="url">spark-little-tips</a></h2><div class="post-meta-container"><div class="post-meta"><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar"></i> </span><span class="post-meta-item-text">发表于</span> <time title="创建时间：2017-03-28 19:20:56" itemprop="dateCreated datePublished" datetime="2017-03-28T19:20:56+08:00">2017-03-28</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-calendar-check"></i> </span><span class="post-meta-item-text">更新于</span> <time title="修改时间：2020-01-12 21:08:26" itemprop="dateModified" datetime="2020-01-12T21:08:26+08:00">2020-01-12</time> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-folder"></i> </span><span class="post-meta-item-text">分类于</span> <span itemprop="about" itemscope itemtype="http://schema.org/Thing"><a href="/categories/data-analysis/" itemprop="url" rel="index"><span itemprop="name">data analysis</span></a> </span></span><span id="/2017/03/28/spark-little-tips/" class="post-meta-item leancloud_visitors" data-flag-title="spark-little-tips" title="阅读次数"><span class="post-meta-item-icon"><i class="far fa-eye"></i> </span><span class="post-meta-item-text">阅读次数：</span> <span class="leancloud-visitors-count"></span> </span><span class="post-meta-item"><span class="post-meta-item-icon"><i class="far fa-comment"></i> </span><span class="post-meta-item-text">Disqus：</span> <a title="disqus" href="/2017/03/28/spark-little-tips/#disqus_thread" itemprop="discussionUrl"><span class="post-comments-count disqus-comment-count" data-disqus-identifier="2017/03/28/spark-little-tips/" itemprop="commentCount"></span></a></span></div></div></header><div class="post-body" itemprop="articleBody"><h2 id="spark-的一些粗浅使用经验"><a href="#spark-的一些粗浅使用经验" class="headerlink" title="spark 的一些粗浅使用经验"></a>spark 的一些粗浅使用经验</h2><p>工作中学习使用了一下Spark做数据分析,主要是用spark的python接口，首先是<code>pyspark.SparkContext(appName=xxx)</code>，这是初始化一个Spark应用实例或者说会话，不能重复，<br>返回的实例句柄就可以调用<code>textFile(path)</code>读取文本文件，这里的文本文件可以是HDFS上的文本文件，也可以普通文本文件，但是需要在Spark的所有集群上都存在，否则会<br>读取失败，<code>parallelize</code>则可以将python生成的集合数据读取后转换成rdd(A Resilient Distributed Dataset (RDD),一种spark下的基本抽象数据集),基于这个RDD就可以做<br>数据的流式计算，例如<code>map reduce</code>,在Spark中可以非常方便地实现</p><h3 id="简单的mapreduce-word-count示例"><a href="#简单的mapreduce-word-count示例" class="headerlink" title="简单的mapreduce word count示例"></a>简单的mapreduce word count示例</h3><pre class="line-numbers language-Python" data-language="Python"><code class="language-Python">textFile &#x3D; sc.parallelize([(1,1), (2,1), (3,1), (4,1), (5,1),(1,1), (2,1), (3,1), (4,1), (5,1)])
data &#x3D; textFile.reduceByKey(lambda x, y: x + y).collect()
for _ in data:
print(_)<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre><h3 id="结果"><a href="#结果" class="headerlink" title="结果"></a>结果</h3><pre class="line-numbers language-none"><code class="language-none">(3, 2)
(1, 2)
(4, 2)
(2, 2)
(5, 2)<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre></div><footer class="post-footer"><div class="post-eof"></div></footer></article></div><nav class="pagination"><a class="extend prev" rel="prev" title="上一页" aria-label="上一页" href="/page/34/"><i class="fa fa-angle-left"></i></a><a class="page-number" href="/">1</a><span class="space">&hellip;</span><a class="page-number" href="/page/34/">34</a><span class="page-number current">35</span><a class="page-number" href="/page/36/">36</a><span class="space">&hellip;</span><a class="page-number" href="/page/39/">39</a><a class="extend next" rel="next" title="下一页" aria-label="下一页" href="/page/36/"><i class="fa fa-angle-right"></i></a></nav></div></main><footer class="footer"><div class="footer-inner"><div class="beian"><a href="https://beian.miit.gov.cn/" rel="noopener" target="_blank">浙ICP备16002580号-2 </a><img src="/uploads/beian.png" alt=""><a href="http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=33010602011094" rel="noopener" target="_blank">浙公网安备 33010602011094号</a></div><div class="copyright">&copy; 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