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<!DOCTYPE html>

<head>

var NexT = window.NexT || {};

var CONFIG = {

hostname: new URL('https://alreadygo.github.io').hostname,

root: '/',

scheme: 'Muse',

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exturl: false,

sidebar: {"position":"right","display":"post","offset":12,"onmobile":false},

copycode: {"enable":false,"show_result":false,"style":null},

back2top: {"enable":true,"sidebar":false,"scrollpercent":false},

bookmark: {"enable":false,"color":"#222","save":"auto"},

fancybox: false,

mediumzoom: false,

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indexName: '',

hits: {"per_page":10},

labels: {"input_placeholder":"Search for Posts","hits_empty":"We didn't find any results for the search: ${query}","hits_stats":"${hits} results found in ${time} ms"}

localsearch: {"enable":false,"trigger":"auto","top_n_per_article":1,"unescape":false,"preload":false},

path: 'search.xml',

motion: {"enable":true,"async":false,"transition":{"post_block":"fadeIn","post_header":"slideDownIn","post_body":"slideDownIn","coll_header":"slideLeftIn","sidebar":"slideUpIn"}},

sidebarPadding: 40

};

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// https://hexo.io/docs/variables.html

CONFIG.page = {

sidebar: "",

isHome: true,

isPost: false,

isPage: false,

isArchive: false

};

</script>

<title>AlreadyGo</title>

<style>

.use-motion .brand,

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.sidebar-inner,

.use-motion .post-block,

.use-motion .pagination,

.use-motion .comments,

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.use-motion .collection-header { opacity: initial; }

.use-motion .site-title,

.use-motion .site-subtitle {

opacity: initial;

top: initial;

}

.use-motion .logo-line-before i { left: initial; }

.use-motion .logo-line-after i { right: initial; }

</style>

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<div>

<span class="site-title">AlreadyGo</span>

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</li>

<a href="/about/" rel="section"><i class="fa fa-fw fa-user"></i>About</a>

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<a href="/archives/" rel="section"><i class="fa fa-fw fa-archive"></i>Archives</a>

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<a href="/2019/12/05/HashMap/" class="post-title-link" itemprop="url">HashMap</a>

</h1>

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<span class="post-meta-item-text">Posted on</span>

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<p>Q1：HashMap 的数据结构？</p>

<p>A1：哈希表结构（链表散列：数组+链表）实现，结合数组和链表的优点。当链表长度超过 8 时，链表转换为红黑树。</p>

<p>Q2：HashMap默认大小是多少？如果传入指定大小是20，那么实际大小是多少？</p>

<p>Q3：HashMap对key进行hash操作的时候有什么特殊处理吗？</p>

<p>Q4：put操作当发生hash碰撞，数据插入链表时，是插入链表头部还是尾部？</p>

<p>Q5：HashMap会出现死循环吗？</p>

<p>Q6：链表长度超过 8 时一定会转换成红黑树吗？</p>

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</footer>

</article>

</span>

</span>

<a href="/2019/10/10/阿里巴巴java手册中关于线程的说明/" class="post-title-link" itemprop="url">线程池原理</a>

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<h2 id="阿里巴巴java手册中关于线程的说明"><a href="#阿里巴巴java手册中关于线程的说明" class="headerlink" title="阿里巴巴java手册中关于线程的说明"></a>阿里巴巴java手册中关于线程的说明</h2><p>1.【强制】创建线程或线程池时请指定有意义的线程名称，方便出错时回溯<br>正例:<br><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TimerTaskThread</span> <span class="keyword">extends</span> <span class="title">Thread</span> </span>{ <span class="function"><span class="keyword">public</span> <span class="title">TimerTaskThread</span><span class="params">()</span> </span>{</span><br><span class="line"> <span class="keyword">super</span>.setName(<span class="string">"TimerTaskThread"</span>);</span><br><span class="line">... }</span><br><span class="line">}</span><br></pre></td></tr></table></figure></p>

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<a href="/2018/01/28/electron实现简单的爬虫客户端/" class="post-title-link" itemprop="url">electron实现简单的爬虫客户端</a>

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<h3 id="下载客户端"><a href="#下载客户端" class="headerlink" title="下载客户端"></a>下载客户端</h3><p><a href="https://github.com/AlreadyGo/crawler-client/releases" target="_blank" rel="noopener">下载win客户端/绿色免安装</a></p>

<h3 id="解压客户端压缩包"><a href="#解压客户端压缩包" class="headerlink" title="解压客户端压缩包"></a>解压客户端压缩包</h3>

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</article>

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<a href="/2017/11/19/elasticsearch之cardinality浅析/" class="post-title-link" itemprop="url">elasticsearch之cardinality浅析</a>

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<h2 id="引言"><a href="#引言" class="headerlink" title="引言"></a>引言</h2><p>大数据时代,类似sum求和或者avg平均值的操作还是相对容易,而比如类似算网站uv或者<br>找出网站访问最频繁访客会比较困难,es中提供了一种cardinality聚合来解决这类问题.<br>

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<a href="/2017/11/13/elasticsearch-yml中重要的配置检查/" class="post-title-link" itemprop="url">elasticsearch.yml中重要的配置检查</a>

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<p>启动集群最小的配置</p>

<h3 id="path-data-和-path-logs"><a href="#path-data-和-path-logs" class="headerlink" title="path.data 和 path.logs"></a>path.data 和 path.logs</h3><p>数据和日志文件路径<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">path:</span><br><span class="line"> logs: /var/log/elasticsearch</span><br><span class="line"> data: /var/data/elasticsearch</span><br></pre></td></tr></table></figure></p>

<p>设置多个路径<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">path:</span><br><span class="line"> data:</span><br><span class="line"> - /mnt/elasticsearch_1</span><br><span class="line"> - /mnt/elasticsearch_2</span><br><span class="line"> - /mnt/elasticsearch_3</span><br></pre></td></tr></table></figure></p>

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<a href="/2017/11/11/es集群启动系统配置检查/" class="post-title-link" itemprop="url">es集群启动系统配置检查</a>

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<h3 id="堆大小检查"><a href="#堆大小检查" class="headerlink" title="堆大小检查"></a>堆大小检查</h3><p>./bin/elasticsearch文件<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ES_HEAP_SIZE=20G</span><br></pre></td></tr></table></figure></p>

<p>./conf/jvm.options<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">-Xms2g </span><br><span class="line">-Xmx2g</span><br></pre></td></tr></table></figure></p>

<ul>

<li>把xms(堆初始化大小)和xmx(最大堆大小)设为相等</li>

<li>堆太小oom,堆太大gc停止时间越长</li>

<li>xmx不要超过机器物理内存的50%</li>

<li>因为jvm使用压缩对象指针,不要把xmx设超过临界点,临界点一般在靠近32G,正确的日志如下:<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">heap size [1.9gb], compressed ordinary object pointers [true]</span><br></pre></td></tr></table></figure>

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<a href="/2017/11/08/es模块配置-集群/" class="post-title-link" itemprop="url">es模块配置-集群</a>

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<p>配置分为static和dynamic两种,<br>static配置在elasticsearch.yml,环境变量,或者在启动节点的命令行中;<br>dynamic可以通过cluster-update-settings api动态更新.<br>

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<a href="/2017/10/22/es集群滚动重启/" class="post-title-link" itemprop="url">es集群滚动重启</a>

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<h2 id="禁止分片分配"><a href="#禁止分片分配" class="headerlink" title="禁止分片分配"></a>禁止分片分配</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line">curl -XPUT '/_cluster/settings?pretty' -d '{</span><br><span class="line"> "transient": {</span><br><span class="line"> "cluster.routing.allocation.enable": "none"</span><br><span class="line"> }</span><br><span class="line">}'</span><br></pre></td></tr></table></figure>

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<p>$ npm install hexo-cli -g</p>

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<a href="/2017/03/21/shaowsocks/" class="post-title-link" itemprop="url">shaowsocks</a>

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<h3 id="本脚本适用环境"><a href="#本脚本适用环境" class="headerlink" title="本脚本适用环境"></a>本脚本适用环境</h3><h4 id="系统支持：CentOS，Debian，Ubuntu"><a href="#系统支持：CentOS，Debian，Ubuntu" class="headerlink" title="系统支持：CentOS，Debian，Ubuntu"></a>系统支持：CentOS，Debian，Ubuntu</h4><h4 id="内存要求：≥128M"><a href="#内存要求：≥128M" class="headerlink" title="内存要求：≥128M"></a>内存要求：≥128M</h4><h3 id="关于本脚本"><a href="#关于本脚本" class="headerlink" title="关于本脚本"></a>关于本脚本</h3><h4 id="一键安装-ShadowsocksR-服务端。"><a href="#一键安装-ShadowsocksR-服务端。" class="headerlink" title="一键安装 ShadowsocksR 服务端。"></a>一键安装 ShadowsocksR 服务端。</h4><p>请下载与之配套的客户端程序来连接。<br>（以下客户端只有 <a href="https://github.com/breakwa11/shadowsocks-csharp/releases" target="_blank" rel="noopener">Windows 客户端</a>和 <a href="https://github.com/breakwa11/shadowsocks-rss/wiki/Python-client" target="_blank" rel="noopener">Python 版客户端</a>可以使用 SSR 新特性，其他原版客户端只能以兼容的方式连接 SSR 服务器）</p>

<h4 id="默认配置"><a href="#默认配置" class="headerlink" title="默认配置"></a>默认配置</h4><h5 id="服务器端口：自己设定（如不设定，默认为-8989）"><a href="#服务器端口：自己设定（如不设定，默认为-8989）" class="headerlink" title="服务器端口：自己设定（如不设定，默认为 8989）"></a>服务器端口：自己设定（如不设定，默认为 8989）</h5><h5 id="客户端端口：1080"><a href="#客户端端口：1080" class="headerlink" title="客户端端口：1080"></a>客户端端口：1080</h5><h5 id="密码：自己设定（如不设定，默认为teddysun-com）"><a href="#密码：自己设定（如不设定，默认为teddysun-com）" class="headerlink" title="密码：自己设定（如不设定，默认为teddysun.com）"></a>密码：自己设定（如不设定，默认为teddysun.com）</h5>

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