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</head><body><div id="sidebar"><div id="menu-mask"></div><div id="sidebar-menus"><div class="author-avatar"><img class="avatar-img" data-lazy-src="https://cdn.jsdelivr.net/gh/kense-lab/kense-lab.github.io/img/avatar.webp" onerror="onerror=null;src='/img/friend_404.gif'" alt="avatar"/></div><div class="site-data"><div class="data-item is-center"><div class="data-item-link"><a href="/archives/"><div class="headline">文章</div><div class="length-num">6</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/tags/"><div class="headline">标签</div><div class="length-num">10</div></a></div></div><div class="data-item is-center"><div class="data-item-link"><a href="/categories/"><div class="headline">分类</div><div class="length-num">6</div></a></div></div></div><hr/><div class="menus_items"><div class="menus_item"><a class="site-page" href="/"><i class="fa-fw fas fa-home"></i><span> 首页</span></a></div><div class="menus_item"><a class="site-page" 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class="social-icon" href="https://github.com/kense-lab" target="_blank" title="Github"><i class="fab fa-github"></i></a><a class="social-icon" href="mailto:limeng1300881350@gmail.com" target="_blank" title="Email"><i class="fas fa-envelope"></i></a><a class="social-icon" href="/atom.xml" target="_blank" title=""><i class="fas fa-rss"></i></a><a class="social-icon" href="https://segmentfault.com/u/kense_lab" target="_blank" title=""><i class="fab fa-cuttlefish flat-btn"></i></a></div></div><div id="scroll-down"><i class="fas fa-angle-down scroll-down-effects"></i></div></header><main class="layout" id="content-inner"><div class="recent-posts" id="recent-posts"><div class="recent-post-item"><div class="post_cover left_radius"><a href="/2021/01/11/%E7%BC%93%E5%AD%98%E6%B7%98%E6%B1%B0%E7%AE%97%E6%B3%95-LRU-LFU-%E5%AF%B9%E6%AF%94/" title="缓存淘汰算法 LRU/LFU 对比"> <img class="post_bg" data-lazy-src="https://cdn.jsdelivr.net/gh/kense-lab/kense-lab.github.io/img/cover5.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="缓存淘汰算法 LRU/LFU 对比"></a></div><div class="recent-post-info"><a class="article-title" href="/2021/01/11/%E7%BC%93%E5%AD%98%E6%B7%98%E6%B1%B0%E7%AE%97%E6%B3%95-LRU-LFU-%E5%AF%B9%E6%AF%94/" title="缓存淘汰算法 LRU/LFU 对比">缓存淘汰算法 LRU/LFU 对比</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2021-01-11T11:06:02.000Z" title="发表于 2021-01-11 19:06:02">2021-01-11</time><span class="article-meta__separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-11-25T08:03:12.179Z" title="更新于 2021-11-25 16:03:12">2021-11-25</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Cache/">Cache</a></span><span class="article-meta tags"><span class="article-meta__separator">|</span><i class="fas fa-tag article-meta__icon"></i><a class="article-meta__tags" href="/tags/Cache/">Cache</a><span class="article-meta__link">•</span><a class="article-meta__tags" href="/tags/%E7%AE%97%E6%B3%95/">算法</a></span></div><div class="content">前言缓存淘汰算法是指：在有限容量的 list 中，空间被占满后要存入新的 item 时，决定出那个数据应该被剔除剔除的一类算法。其核心是为了计算出哪个 item 应该被剔除，也就是淘汰机制。
介绍LRU (Least Recently Used / 最近最少使用)淘汰最久没有用过的元素。
基本思想如果数据过去被访问多次，那么将来被访问的频率也更高。
存在的问题偶发性的、周期性的批量查询操作（包含冷数据）会淘汰掉大量的热点数据，导致 LRU 命中率急剧下降，缓存污染情况比较严重。
LFU (Least Frequently Used / 最不经常使用)淘汰访问频率最低的元素。
注意 LFU 和 LRU 的区别，LRU 的淘汰规则是基于访问时间，而 LFU 是基于访问次数。
基本思想如果数据最近被访问过，那么将来被访问的几率也更高。
存在的问题：
最近加入的数据总是易于被剔除（缓存末端抖动），因为他起始的频率很低。它无法对一个拥有最初高访问率之后长时间没有被访问的条目缓存负责。
为了避免早期的热点数据一直占据缓存，即LFU算法也需有一些访问时间模式的特性。但是，如果频率的时间度量是 1 小 ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/2021/01/07/Hexo-%E5%8D%9A%E5%AE%A2%E6%90%AD%E5%BB%BA/" title="Hexo 博客搭建"> <img class="post_bg" data-lazy-src="https://cdn.jsdelivr.net/gh/kense-lab/kense-lab.github.io/img/cover2.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="Hexo 博客搭建"></a></div><div class="recent-post-info"><a class="article-title" href="/2021/01/07/Hexo-%E5%8D%9A%E5%AE%A2%E6%90%AD%E5%BB%BA/" title="Hexo 博客搭建">Hexo 博客搭建</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2021-01-07T06:11:27.000Z" title="发表于 2021-01-07 14:11:27">2021-01-07</time><span class="article-meta__separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-11-25T08:03:12.178Z" title="更新于 2021-11-25 16:03:12">2021-11-25</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/%E5%BB%BA%E7%AB%99/">建站</a></span><span class="article-meta tags"><span class="article-meta__separator">|</span><i class="fas fa-tag article-meta__icon"></i><a class="article-meta__tags" href="/tags/%E5%BB%BA%E7%AB%99/">建站</a></span></div><div class="content">安装 Hexo安装 Hexo 命令行工具1npm i -g hexo-cli
创建博客项目1hexo init blog
进入博客项目目录1cd blog
安装依赖1npm i
启动服务器1hexo server
安装 Butterfly 主题安装主题1git clone -b master https://github.com/jerryc127/hexo-theme-butterfly.git themes/butterfly
应用主题修改站点配置文件 _config.yaml，把主题改为 butterfly
1theme: butterfly
安裝 Pug 插件1npm i hexo-renderer-pug --save
安装字数统计插件1npm i hexo-wordcount --save
安装搜索插件1npm i hexo-generator-search --save
安装 RSS 插件1npm i hexo-generator-feed --save
_config.xml 添加
1234feed: # Generate both atom and rss2 fe ...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/2021/01/02/2020%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/" title="2020 年终总结"> <img class="post_bg" data-lazy-src="https://cdn.jsdelivr.net/gh/kense-lab/kense-lab.github.io/img/cover1.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="2020 年终总结"></a></div><div class="recent-post-info"><a class="article-title" href="/2021/01/02/2020%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/" title="2020 年终总结">2020 年终总结</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2021-01-02T12:00:00.000Z" title="发表于 2021-01-02 20:00:00">2021-01-02</time><span class="article-meta__separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-11-25T08:03:12.178Z" title="更新于 2021-11-25 16:03:12">2021-11-25</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/">年终总结</a></span><span class="article-meta tags"><span class="article-meta__separator">|</span><i class="fas fa-tag article-meta__icon"></i><a class="article-meta__tags" href="/tags/%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/">年终总结</a></span></div><div class="content">2020 总结Work2020 年是我从 2018 年毕业参加工作以来能力提升最大的一年。
这一年我在公司参与了数据平台的开发，并作为核心开发人员。
开始接触大数据生态，主要研究了 Kudu、Impala、NiFi、Flink。
coding 能力提升了很多。
开发环境从 Manjaro 切换到了 macOS。
Blog开始尝试写博客了，刚开始写的东西不太有深度，要慢慢写一些有深度的东西。
LeetCode开始刷 LeetCode 了，感觉刷一刷 LeetCode 还是很有必要的。目前我的收获是：有了复杂度分析的意识，coding 能力提高了。
源码研究主要研究了一些 NiFi 源码，因工作需要还给他做了个汉化（虽然汉化的程度也不是很高😝）。话说 NiFi 用 NAR 包做类资源隔离和 Processor 扩展的设计真棒啊👍。
Book技术类的《算法》，一边刷题一边看。最近买了本《数据密集型应用系统设计》，刚要开始看。小说类《追风筝的人》，每天在地铁上看一会，中午吃完饭有时会看一会，目前还没有看完，慢慢看，看书的时候心情很好。
我看书很慢，比较细🤣
2021 flag
写 10 ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/2020/11/29/JNI%E4%BD%BF%E7%94%A8%E6%95%99%E7%A8%8B/" title="JNI 使用教程"> <img class="post_bg" data-lazy-src="https://cdn.jsdelivr.net/gh/kense-lab/kense-lab.github.io/img/cover4.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="JNI 使用教程"></a></div><div class="recent-post-info"><a class="article-title" href="/2020/11/29/JNI%E4%BD%BF%E7%94%A8%E6%95%99%E7%A8%8B/" title="JNI 使用教程">JNI 使用教程</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-11-29T12:00:00.000Z" title="发表于 2020-11-29 20:00:00">2020-11-29</time><span class="article-meta__separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-11-25T08:03:12.178Z" title="更新于 2021-11-25 16:03:12">2021-11-25</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/Java/">Java</a></span><span class="article-meta tags"><span class="article-meta__separator">|</span><i class="fas fa-tag article-meta__icon"></i><a class="article-meta__tags" href="/tags/Java/">Java</a><span class="article-meta__link">•</span><a class="article-meta__tags" href="/tags/JNI/">JNI</a></span></div><div class="content">JNI 使用教程
编写 Java 测试类
123456789101112131415161718public class TestJNI { // 定义 native 方法 private native void say(); static { // 加载动态库 // 从当前路径或 java.library.path 查找, 去掉文件扩展名, macos 需要去掉 lib 前缀 System.loadLibrary("TestJNI"); // 或者使用文件绝对路径加载 // System.load( "/path/to/TestJNI.so"); } public static void main(String[] args) { new TestJNI().say(); }}
利用 Java 类生成 C++ 头文件
1javah TestJNI
修改 Test ...</div></div></div><div class="recent-post-item"><div class="post_cover left_radius"><a href="/2020/11/28/%E8%AE%B0%E5%BD%95%E4%B8%80%E6%AC%A1Rancher-Server%E7%9A%84Docker%E9%95%9C%E5%83%8F%E4%B8%A2%E5%A4%B1%E5%92%8C%E8%AF%81%E4%B9%A6%E8%BF%87%E6%9C%9F%E9%97%AE%E9%A2%98/" title="记录一次 Rancher Server 的 Docker 镜像丢失和证书过期问题"> <img class="post_bg" data-lazy-src="https://cdn.jsdelivr.net/gh/kense-lab/kense-lab.github.io/img/cover3.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="记录一次 Rancher Server 的 Docker 镜像丢失和证书过期问题"></a></div><div class="recent-post-info"><a class="article-title" href="/2020/11/28/%E8%AE%B0%E5%BD%95%E4%B8%80%E6%AC%A1Rancher-Server%E7%9A%84Docker%E9%95%9C%E5%83%8F%E4%B8%A2%E5%A4%B1%E5%92%8C%E8%AF%81%E4%B9%A6%E8%BF%87%E6%9C%9F%E9%97%AE%E9%A2%98/" title="记录一次 Rancher Server 的 Docker 镜像丢失和证书过期问题">记录一次 Rancher Server 的 Docker 镜像丢失和证书过期问题</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-11-28T12:00:00.000Z" title="发表于 2020-11-28 20:00:00">2020-11-28</time><span class="article-meta__separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-11-25T08:03:12.179Z" title="更新于 2021-11-25 16:03:12">2021-11-25</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/%E5%AE%B9%E5%99%A8%E5%8C%96/">容器化</a></span><span class="article-meta tags"><span class="article-meta__separator">|</span><i class="fas fa-tag article-meta__icon"></i><a class="article-meta__tags" href="/tags/Rancher/">Rancher</a><span class="article-meta__link">•</span><a class="article-meta__tags" href="/tags/Docker/">Docker</a></span></div><div class="content">背景Docker 版本:18.06.3-ce
Rancher 版本:2.3.2
现象:
Rancher UI 无法访问, 下游集群一切正常
docker ps 查看 Rancher Server 容器丢失
docker images 查看 Rancher Server 镜像丢失
寻找 Rancher Server 容器
重新拉取 Rancher Server 镜像 1docker pull rancher/rancher:v2.3.2
执行 docker ps -a | grep 'rancher\/rancher:v2.3.2' 发现丢失的 Rancher Server 容器回来了
得出结论: Rancher Server 容器丢失的原因是: 依赖的镜像丢失了, 容器也就无法显示了, 并没有真正丢失 Rancher Server 镜像丢失原因不明, 可能是非正常关机或文件系统损坏等原因导致的
发现新问题重新启动 Rancher Server 容器, 但启动失败容器日志中发现 x509: certificate has expired or is not ...</div></div></div><div class="recent-post-item"><div class="post_cover right_radius"><a href="/2020/11/20/NiFi-1.10.0+%E7%89%88%E6%9C%AC%E4%BD%BF%E7%94%A8-Kafka-0.8.x/" title="NiFi 1.10.0+ 版本使用 Kafka 0.8.x"> <img class="post_bg" data-lazy-src="https://cdn.jsdelivr.net/gh/kense-lab/kense-lab.github.io/img/cover5.webp" onerror="this.onerror=null;this.src='/img/404.jpg'" alt="NiFi 1.10.0+ 版本使用 Kafka 0.8.x"></a></div><div class="recent-post-info"><a class="article-title" href="/2020/11/20/NiFi-1.10.0+%E7%89%88%E6%9C%AC%E4%BD%BF%E7%94%A8-Kafka-0.8.x/" title="NiFi 1.10.0+ 版本使用 Kafka 0.8.x">NiFi 1.10.0+ 版本使用 Kafka 0.8.x</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-11-20T12:00:00.000Z" title="发表于 2020-11-20 20:00:00">2020-11-20</time><span class="article-meta__separator">|</span><i class="fas fa-history"></i><span class="article-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2021-11-25T08:03:12.179Z" title="更新于 2021-11-25 16:03:12">2021-11-25</time></span><span class="article-meta"><span class="article-meta__separator">|</span><i class="fas fa-inbox article-meta__icon"></i><a class="article-meta__categories" href="/categories/%E6%95%B0%E6%8D%AE%E5%A4%84%E7%90%86/">数据处理</a></span><span class="article-meta tags"><span class="article-meta__separator">|</span><i class="fas fa-tag article-meta__icon"></i><a class="article-meta__tags" href="/tags/NiFi/">NiFi</a><span class="article-meta__link">•</span><a class="article-meta__tags" href="/tags/ETL/">ETL</a></span></div><div class="content">背景需要从 Kafka 0.8.x 版本订阅消息, 然后发送消息到 Kafka 1.0.x 版本中, 其中涉及到了 Kafka 版本冲突的问题, NiFi 很好的解决了这个问题
NiFi 开发人员指南 NiFi Archives (NARs) 章节中有如下说明
When software from many different organizations is all hosted within the same environment, Java ClassLoaders quickly become a concern. If multiple components have a dependency on the same library but each depends on a different version, many problems arise, typically resulting in unexpected behavior or NoClassDefFoundError errors occurring. In order to prevent these ...</div></div></div><nav id="pagination"><div class="pagination"><span class="page-number current">1</span></div></nav></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="card-info-avatar is-center"><img class="avatar-img" data-lazy-src="https://cdn.jsdelivr.net/gh/kense-lab/kense-lab.github.io/img/avatar.webp" onerror="this.onerror=null;this.src='/img/friend_404.gif'" alt="avatar"/><div class="author-info__name">Kense</div><div class="author-info__description">君子性非异也，善假于物也</div></div><div class="card-info-data"><div class="card-info-data-item is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">6</div></a></div><div class="card-info-data-item is-center"><a href="/tags/"><div class="headline">标签</div><div class="length-num">10</div></a></div><div class="card-info-data-item is-center"><a href="/categories/"><div class="headline">分类</div><div 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href="/2020/11/28/%E8%AE%B0%E5%BD%95%E4%B8%80%E6%AC%A1Rancher-Server%E7%9A%84Docker%E9%95%9C%E5%83%8F%E4%B8%A2%E5%A4%B1%E5%92%8C%E8%AF%81%E4%B9%A6%E8%BF%87%E6%9C%9F%E9%97%AE%E9%A2%98/" title="记录一次 Rancher Server 的 Docker 镜像丢失和证书过期问题">记录一次 Rancher Server 的 Docker 镜像丢失和证书过期问题</a><time datetime="2020-11-28T12:00:00.000Z" title="发表于 2020-11-28 20:00:00">2020-11-28</time></div></div></div></div><div class="card-widget card-categories"><div class="item-headline"><i class="fas fa-folder-open"></i><span>分类</span></div><ul class="card-category-list" id="aside-cat-list">
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</ul></div><div class="card-widget card-tags"><div class="item-headline"><i class="fas fa-tags"></i><span>标签</span></div><div class="card-tag-cloud"><a href="/tags/Cache/" style="font-size: 1.1em; color: #999">Cache</a> <a href="/tags/Docker/" style="font-size: 1.1em; color: #999">Docker</a> <a href="/tags/ETL/" style="font-size: 1.1em; color: #999">ETL</a> <a href="/tags/JNI/" style="font-size: 1.1em; color: #999">JNI</a> <a href="/tags/Java/" style="font-size: 1.1em; color: #999">Java</a> <a href="/tags/NiFi/" style="font-size: 1.1em; color: #999">NiFi</a> <a href="/tags/Rancher/" style="font-size: 1.1em; color: #999">Rancher</a> <a href="/tags/%E5%B9%B4%E7%BB%88%E6%80%BB%E7%BB%93/" style="font-size: 1.1em; color: #999">年终总结</a> <a href="/tags/%E5%BB%BA%E7%AB%99/" style="font-size: 1.1em; color: #999">建站</a> <a href="/tags/%E7%AE%97%E6%B3%95/" style="font-size: 1.1em; color: #999">算法</a></div></div><div class="card-widget card-archives"><div class="item-headline"><i class="fas fa-archive"></i><span>时间轴</span></div><ul class="card-archive-list"><li class="card-archive-list-item"><a class="card-archive-list-link" href="/archives/2021/01/"><span class="card-archive-list-date">一月 2021</span><span class="card-archive-list-count">3</span></a></li><li class="card-archive-list-item"><a class="card-archive-list-link" href="/archives/2020/11/"><span class="card-archive-list-date">十一月 2020</span><span class="card-archive-list-count">3</span></a></li></ul></div><div class="card-widget card-webinfo"><div class="item-headline"><i class="fas fa-chart-line"></i><span>网站资讯</span></div><div class="webinfo"><div class="webinfo-item"><div class="item-name">文章数目 :</div><div class="item-count">6</div></div><div class="webinfo-item"><div class="item-name">已运行时间 :</div><div class="item-count" id="runtimeshow" data-publishDate="2021-11-25T08:34:17.897Z"></div></div><div class="webinfo-item"><div class="item-name">本站总字数 :</div><div class="item-count">3.1k</div></div><div class="webinfo-item"><div class="item-name">本站访客数 :</div><div class="item-count" id="busuanzi_value_site_uv"></div></div><div class="webinfo-item"><div class="item-name">本站总访问量 :</div><div class="item-count" id="busuanzi_value_site_pv"></div></div><div class="webinfo-item"><div class="item-name">最后更新时间 :</div><div class="item-count" id="last-push-date" data-lastPushDate="2021-11-25T08:34:17.901Z"></div></div></div></div></div></div></main><footer id="footer" style="background: #49b1f5"><div id="footer-wrap"><div class="copyright">©2020 - 2021 By Kense</div><div class="framework-info"><span>框架 </span><a target="_blank" rel="noopener" href="https://hexo.io">Hexo</a><span class="footer-separator">|</span><span>主题 </span><a target="_blank" rel="noopener" href="https://github.com/jerryc127/hexo-theme-butterfly">Butterfly</a></div></div></footer></div><div id="rightside"><div id="rightside-config-hide"><button id="darkmode" type="button" title="浅色和深色模式转换"><i class="fas fa-adjust"></i></button><button id="hide-aside-btn" type="button" title="单栏和双栏切换"><i class="fas fa-arrows-alt-h"></i></button></div><div id="rightside-config-show"><button id="rightside_config" type="button" title="设置"><i class="fas fa-cog fa-spin"></i></button><button id="go-up" type="button" title="回到顶部"><i class="fas fa-arrow-up"></i></button></div></div><div id="local-search"><div class="search-dialog"><div class="search-dialog__title" id="local-search-title">搜索</div><div id="local-input-panel"><div id="local-search-input"><div class="local-search-box"><input class="local-search-box--input" placeholder="搜索文章" type="text"/></div></div></div><hr/><div id="local-search-results"></div><span class="search-close-button"><i class="fas fa-times"></i></span></div><div id="search-mask"></div></div><div><script src="/js/utils.js"></script><script src="/js/main.js"></script><script src="https://cdn.jsdelivr.net/npm/instant.page/instantpage.min.js" type="module"></script><script src="https://cdn.jsdelivr.net/npm/vanilla-lazyload/dist/lazyload.iife.min.js"></script><script src="https://cdn.jsdelivr.net/npm/node-snackbar/dist/snackbar.min.js"></script><script>function panguFn () {
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