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<!DOCTYPE HTML>
<html lang="zh-CN">
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<title>行胜于言</title>
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<h1 class="site-name"><a href="/" title="行胜于言">行胜于言</a></h1>
<h2 class="blog-motto">Follow your heart</h2>
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<h1 itemprop="name">
<a href="/distributed/2018/09/02/dubbo-loadbalance/" title="Dubbo一致性哈希遇到的坑" itemprop="url">Dubbo一致性哈希遇到的坑</a>
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<p class="article-author">By
<a href="/about" title="xiabo2011" target="_blank" itemprop="author">xiabo2011</a>
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<time datetime="2018-09-02 08:01:01 +0800" itemprop="datePublished"> 2018-09-02</time>
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<p>关于dubbo的负载均衡策略已经有太多blog介绍了，这里说一下我在使用dubbo一致性哈希负载均衡策略时候遇到的一个坑。</p>
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<a href="/distributed/2018/09/02/zookeeper-curator/" title="Zookeeper Curator" itemprop="url">Zookeeper Curator</a>
</h1>
<p class="article-author">By
<a href="/about" title="xiabo2011" target="_blank" itemprop="author">xiabo2011</a>
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<p class="article-time">
<time datetime="2018-09-02 08:01:01 +0800" itemprop="datePublished"> 2018-09-02</time>
</p>
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<div class="article-content">
<p>Curator是一个Zookeeper的客户端库，是一个分布式协调服务，来帮助你管理zookeeper的连接，减少使用zookeeper的复杂性。
它包含了一套高级API和通用的utilities，提供了一些recipes（如lock，barriers和cache等）和操作（如create, delete, getData等）,
这些都使得编写的应用可以更加鲁棒。</p>
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<a href="/distributed/2018/09/02/zookeeper-curator/#more">Read More</a>
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<a href="/tags/#zookeeper">zookeeper</a>
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<a href="/distributed/2018/08/26/zookeeper-api/" title="Zookeeper API使用" itemprop="url">Zookeeper API使用</a>
</h1>
<p class="article-author">By
<a href="/about" title="xiabo2011" target="_blank" itemprop="author">xiabo2011</a>
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<p class="article-time">
<time datetime="2018-08-26 08:01:01 +0800" itemprop="datePublished"> 2018-08-26</time>
</p>
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<div class="article-content">
<h2 id="zookeeper-session">Zookeeper session</h2>
<p>Zookeeper client通过创建一个session与Zookeeper server通信，如果与某一台server的连接断了，session会转移到与另一台server建立的连接。通过org.apache.zookeeper.Zookeeper类构建zookeeper session</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nc">Zookeeper</span><span class="o">(</span>
<span class="nc">String</span> <span class="n">connectString</span><span class="o">,</span> <span class="c1">// servers address e.g.: "127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183"</span>
<span class="kt">int</span> <span class="n">sessionTimeout</span><span class="o">,</span> <span class="c1">// session timeout in millisecond</span>
<span class="nc">Watcher</span> <span class="n">watcher</span> <span class="c1">// 用来接收session event, watcher是接口，需要传递一个实现接口的实例化object</span>
<span class="o">)</span>
</code></pre></div></div>
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<a href="/blockchain/2018/06/30/first-smart-contract/" title="在本地私链上运行智能合约" itemprop="url">在本地私链上运行智能合约</a>
</h1>
<p class="article-author">By
<a href="/about" title="xiabo2011" target="_blank" itemprop="author">xiabo2011</a>
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<p class="article-time">
<time datetime="2018-06-30 08:01:01 +0800" itemprop="datePublished"> 2018-06-30</time>
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<h2 id="准备工作">准备工作</h2>
<ul>
<li>根据上一篇blog搭建私链</li>
<li>下载 <a href="https://github.com/ethereum/remix-ide/tree/gh-pages">remix-ide</a>，我们这里要下载<em>gh-pages</em>分支，该分支为最新的稳定的build。remix-ide是一个用来编译运行智能合约的ide工具</li>
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<a href="/tags/#ethereum">ethereum</a>
<a href="/tags/#以太坊">以太坊</a>
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<a href="/blockchain/2018/06/30/local-private-ethereum/" title="搭建本地以太坊私链" itemprop="url">搭建本地以太坊私链</a>
</h1>
<p class="article-author">By
<a href="/about" title="xiabo2011" target="_blank" itemprop="author">xiabo2011</a>
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<time datetime="2018-06-30 08:01:01 +0800" itemprop="datePublished"> 2018-06-30</time>
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<h2 id="macos以太坊安装">macOS以太坊安装</h2>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>$ brew tap ethereum/ethereum
$ brew install ethereum
</code></pre></div></div>
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<a href="/blockchain/2018/06/30/local-private-ethereum/#more">Read More</a>
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<a href="/distributed/2018/06/03/zookeeper-basics/" title="Zookeeper基础" itemprop="url">Zookeeper基础</a>
</h1>
<p class="article-author">By
<a href="/about" title="xiabo2011" target="_blank" itemprop="author">xiabo2011</a>
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<p class="article-time">
<time datetime="2018-06-03 08:01:01 +0800" itemprop="datePublished"> 2018-06-03</time>
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<p>一般设计一个分布式协同服务都会提供一组primitives的列表，对于每个primitive暴露一些接口来创建实例，比如分布式锁可以作为一个primitive，
它暴露了一些接口如create, acquire, release等。这种设计会存在一些问题：1）扩展性差，需要提供大量的primitives，还要不断扩展API；
2）灵活性差，对于不同应用适用性会差的较多</p>
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<a href="/distributed/2018/06/02/zookeeper-getting-started/" title="Zookeeper服务器集群搭建" itemprop="url">Zookeeper服务器集群搭建</a>
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<h2 id="获取zookeeper">获取zookeeper</h2>
<p>从apache zookeeper官网上获取zookeeper</p>
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