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<a class="post-title-link" href="/2017/05/08/determinat-vs-deterministic/" itemprop="url">deterministic 和 determinat 有什么区别？</a></h2>
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<p>deterministic 和 determinat 翻译过来都是“确定性的”，但这并不代表它们可以互相混用，在并行计算的语境下，它们有着一些根本的差别。</p>
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<a class="post-title-link" href="/2017/04/19/introduce-the-concept-of-windowing-in-streaming-processing/" itemprop="url">流计算核心概念解析之 window</a></h2>
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<p>流计算是当前备受关注的一个大数据研究与应用领域，旨在实时或近实时地处理大量无界数据。区别于批处理，流处理中处理的数据集是无界的，所以聚集操作（如 reduce、sum、count 等）无法应用于整个数据集，否则聚集操作的结果可能永远都不会输出。我们需要将无界的数据集切分成一些有界的片段，将聚集操作应用于这些片段，从而能够在无界的数据集上得到持续的聚集操作输出结果，这一切分过程即被称为 window。流计算领域的许多概念、系统设计、实现细节都围绕着 window 展开，window 的支持程度也是我们对众多的流计算框架进行选型的重要依据。要理解 window，我们需要回答以下关键问题：</p>
<ol>
<li>如何根据window进行数据划分？</li>
<li>如何定义在window相关的操作中涉及的时间概念？</li>
<li>如何输出基于window的操作的处理结果？</li>
</ol>
<p>下文将逐一回答这些关键问题，并在最后比较当前较热门的各流计算框架对 window 的支持程度。</p>
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<h2 id="git-本地更改操作">Git 本地更改操作</h2>
<h3 id="初始化">初始化</h3>
<ul>
<li>初始化一个 Git 仓库：<code>git init</code></li>
</ul>
<h3 id="提交修改">提交修改</h3>
<ul>
<li>添加文件到暂存区：<code>git add <file></code>
<ul>
<li>添加所有修改到暂存区：<code>git add .</code></li>
</ul>
</li>
<li>将暂存区的修改提交到版本库：<code>git commit</code> -> 编辑 commit message -> 保存
<ul>
<li>commit message 较简单时，可以：<code>git commit -m "<message>"</code></li>
</ul>
</li>
<li>为文件添加执行权限，并将修改添加到暂存区：<code>git update-index --chmod=+x <file></code></li>
</ul>
<h3 id="回退修改">回退修改</h3>
<ul>
<li>回退工作区的修改：<code>git checkout -- <file></code></li>
<li>回退工作区的修改，但保存现场：<code>git stash</code>
<ul>
<li>恢复现场：<code>git stash pop</code></li>
<li>查看保存的现场：<code>git stash list</code></li>
</ul>
</li>
<li>回退暂存区的修改到工作区：<code>git reset HEAD <file></code></li>
<li>回退版本库的修改到工作区：<code>git reset <commit></code> 或 <code>git reset –-mixed <commit></code></li>
<li>回退版本库的修改到暂存区：<code>git reset –-soft <commit></code></li>
<li>回退版本库的修改（<strong>不保留</strong>）：<code>git reset --hard <commit></code>
<ul>
<li>如果错误执行了该回退操作，可以通过 <code>git reflog</code> 查看命令历史，命令历史中记载了回退前的 commit id，可以执行 <code>git reset --hard <commit></code> 回退该回退操作</li>
</ul>
</li>
<li>回退所有未被跟踪的文件：<code>git clean -df</code></li>
</ul>
<h3 id="删除文件">删除文件</h3>
<ul>
<li>从暂存区 + 工作区中删除：<code>git rm <file></code></li>
<li>从暂存区中删除：<code>git rm --cached <file></code></li>
</ul>
<h3 id="跟踪文件">跟踪文件</h3>
<ul>
<li>强制跟踪指定文件：<code>git update-index --no-assume-unchanged <file></code></li>
<li>强制不跟踪指定文件：<code>git update-index --assume-unchanged <file></code></li>
</ul>
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<a class="post-title-link" href="/2017/04/15/continuous-deployment-blog-to-github-pages-with-travis/" itemprop="url">使用 Travis 自动部署博客到 Github Pages</a></h2>
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<p>由于博客的源码和生成站点位于不同的代码仓库中（源码位于 <a href="https://github.com/uchuhimo/uchuhimo.me" target="_blank" rel="noopener">uchuhimo/uchuhimo.me</a>，生成的静态站点位于 <a href="https://github.com/uchuhimo/uchuhimo.github.io" target="_blank" rel="noopener">uchuhimo/uchuhimo.github.io</a>，即个人 GitHub Pages 的仓库），文章的发布过程需要提交两次。作为拥有懒惰这种美德的程序员，自然会开始折腾只需要提交一次、博客就自动部署到 GitHub Pages 上的方法——这里就轮到 Travis 登场了。</p>
<p>接下来，我会先介绍自动部署的原理，再讲解搭建的过程。</p>
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