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<a class="post-title-link" href="/2019/use-the-sharelib-in-apache-oozie-cdh5/" itemprop="url">【译】CDH5 中 Apache Oozie sharelib 的使用</a></h1>
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<p><strong>Oozie 的 ShareLib 内部已经发生变化，从 CDH 5.0.0 开始，以下是你需要知道的</strong></p>
<p>在一年前的这篇<a href="http://blog.cloudera.com/blog/2012/12/how-to-use-the-sharelib-in-apache-oozie/" target="_blank" rel="noopener">博客</a>，我介绍了如何在 CDH 4 中使用的 Apache Oozie ShareLib。但是 ShareLib 在 CDH 5 发生了变化，尤其是目录结构，之前提及的一些内容现在已经过时了(这些变动在 <a href="https://issues.apache.org/jira/browse/OOZIE-1619" target="_blank" rel="noopener">OOZIE-1619</a> 可以看到)。</p>
<h3 id="目录结构变化"><a href="#目录结构变化" class="headerlink" title="目录结构变化"></a>目录结构变化</h3><p>在 CDH 4.x 中，ShareLib 的目录结构类似下面：</p>
<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">/user/oozie/share/lib/distcp/*.jar</span><br><span class="line">/user/oozie/share/lib/hive/*.jar</span><br><span class="line">/user/oozie/share/lib/...</span><br></pre></td></tr></table></figure>
<p>但是在 CDH 5.x 中，目录新增了一个层级，包含了一个时间戳</p>
<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">/user/oozie/share/lib/lib_20140311155426/distcp/*.jar</span><br><span class="line">/user/oozie/share/lib/lib_20140311155426/hive/*.jar</span><br><span class="line">/user/oozie/share/lib/lib_20140311155426/...</span><br></pre></td></tr></table></figure>
<p>ShareLib 的位置仍然像之前那样通过 <code>oozie.service.WorkflowAppService.system.libpath</code> 配置参数指定。<code>lib_<timestamp></code> 目录会被创建在该目录下，如上面示例所示。</p>
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<h3 id="环境"><a href="#环境" class="headerlink" title="环境"></a>环境</h3><ul>
<li>CDH 5.15.2</li>
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<h3 id="问题描述"><a href="#问题描述" class="headerlink" title="问题描述"></a>问题描述</h3><p><img src="https://blog-share-1255904243.cos.ap-guangzhou.myqcloud.com/Impala%E7%9A%84Parquet%20Schema%20Incompatible%E9%97%AE%E9%A2%98/Impala%20schema%20incompatible.png" alt=""></p>
<p>由 Sqoop 从 DB 导入的一张数据表，在 Hive 中能够正常查询。但是将数据导到 Impala 并使用 Impala 进行查询时，若涉及到数据表中的某个列，如 <code>select regip from xxx where xxx</code> , <code>select * from xxx where xxx</code> ,会出现上图的异常。异常的大概意思是 Schema 不兼容，列数据的类型为 STRING， 但数据类型为 int32。</p>
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<p>    不经意间已经12月份了，又到了一年的尾巴，忙完一周的工作能在周末暖暖的被窝里睡个懒觉，真的是舒服得不要不要的。转眼已经毕业离开学校快半年，在现在的公司从实习到正式工作也有一年多了，而自写下第一行代码到现在也有四年多了吧，真的不得不感概时间过得真快。回想起来，成为一名程序员也算是机缘巧合，在大学之前从没接触过也没打算过从事程序员这行。当年高考完，哈哈，可能也是出于理科生的缘故吧，与大多数童鞋一样报的不是机械就是土木专业，不过因为分数不够就只能到软件工程了。要说没有失望那是不存在的，毕竟当时我完全不知道软件工程是怎么样的一个专业（其实我对填报的其他志愿也没什么概念，大学前还真的是只会做题啊），反正当时脑海里仅有的一点认识就是百度里面宽泛的定义#摊手。就这样我也算跟 coding 就结上了，不过大学时从 C 语言，Java 语言到计算机网络、数据库理论、编译原理、操作系统等等的学科，在当时看上去似乎比不上什么编程框架来得有用，但现在看来却是真真切切的影响了我。</p>
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<p>启动器(Launcher)是一个 Oozie 进程，用于运行工作流(workflow)中的单独一个 Action 的客户端</p>
<h3 id="介绍"><a href="#介绍" class="headerlink" title="介绍"></a>介绍</h3><p>启动器是 Oozie 执行模型中非常关键的一部分，下面的架构图向我们展示了 Oozie action 是如何工作的。</p>
<p><img src="https://blog-share-1255904243.cos.ap-guangzhou.myqcloud.com/Oozie%E5%90%AF%E5%8A%A8%E5%99%A8%E5%8F%8A%E6%89%A7%E8%A1%8C%E6%A8%A1%E5%9E%8B/oozie%20%E6%89%A7%E8%A1%8C%E6%A8%A1%E5%9E%8B.png" alt=""></p>
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