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| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>系统设计</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>应用概览</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>TsFile</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>查询引擎</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>元数据管理</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>存储引擎</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>数据查询</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>工具</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>连接器</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/zh/SystemDesign/Connector/Hive-TsFile.html" aria-current="page" class="active sidebar-link">Hive-TsFile</a></li><li><a href="/zh/SystemDesign/Connector/Spark-TsFile.html" class="sidebar-link">Spark-TsFile</a></li><li><a href="/zh/SystemDesign/Connector/Spark-IOTDB.html" class="sidebar-link">Spark-IOTDB</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>客户端</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h2 id="tsfile-的-hive-连接器"><a href="#tsfile-的-hive-连接器" class="header-anchor">#</a> TsFile 的 Hive 连接器</h2> <p>TsFile 的 Hive 连接器实现了通过 Hive 读取外部 TsFile 类型的文件格式的支持，使用户能够通过 Hive 操作 TsFile。</p> <p>连接器的主要功能：</p> <ul><li>将单个 TsFile 文件加载进 Hive，不论文件是存储在本地文件系统或者是 HDFS 中</li> <li>将某个特定目录下的所有文件加载进 Hive，不论文件是存储在本地文件系统或者是 HDFS 中</li> <li>使用 HQL 查询 TsFile</li> <li>到现在为止, 写操作在 hive-connector 中还不支持. 所以, HQL 中的 insert 操作是不被允许的</li></ul> <h3 id="设计原理"><a href="#设计原理" class="header-anchor">#</a> 设计原理</h3> <p>Hive 连接器需要能够解析 TsFile 的文件格式，转化为 Hive 能够识别的按行返回的格式。也需要能够根据用户定义的 Table 的形式，格式化输出。所以，Hive 连接器的功能实现主要分成四个部分</p> <ul><li>将整个 TsFile 文件分片</li> <li>从分片中读取数据，转化为 Hive 能够识别的数据类型</li> <li>解析用户自定义的 Table</li> <li>将数据反序列化为 Hive 的输出格式</li></ul> <h3 id="具体实现类"><a href="#具体实现类" class="header-anchor">#</a> 具体实现类</h3> <p>上述的主要四个功能模块都有其对应的实现类，下面就分别介绍一下这四个实现类。</p> <h4 id="org-apache-iotdb-hive-tsfhiveinputformat"><a href="#org-apache-iotdb-hive-tsfhiveinputformat" class="header-anchor">#</a> org.apache.iotdb.hive.TSFHiveInputFormat</h4> <p>该类主要负责对输入的 TsFile 文件的格式化操作，它继承了<code>FileInputFormat<NullWritable, MapWritable></code>类，一些通用的格式化操作在<code>FileInputFormat</code>中已经有实现，这个类覆写了它的<code>getSplits(JobConf, int)</code>方法，自定义了对于 TsFile 文件的分片方式；以及<code>getRecordReader(InputSpli, JobConf, Reporter)</code>方法，用于生成具体从一个分片中读取数据的 |
| <code>TSFHiveRecordReader</code>。</p> <h4 id="org-apache-iotdb-hive-tsfhiverecordreader"><a href="#org-apache-iotdb-hive-tsfhiverecordreader" class="header-anchor">#</a> org.apache.iotdb.hive.TSFHiveRecordReader</h4> <p>该类主要负责从一个分片中读取 TsFile 的数据。</p> <p>它实现了<code>IReaderSet</code>接口，这个接口里是一些设置类内部属性的方法，主要是为了抽出<code>TSRecordReader</code>和<code>TSHiveRecordReader</code>中重复的代码部分。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public interface IReaderSet { |
| |
| void setReader(TsFileSequenceReader reader); |
| |
| void setMeasurementIds(List<String> measurementIds); |
| |
| void setReadDeviceId(boolean isReadDeviceId); |
| |
| void setReadTime(boolean isReadTime); |
| } |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>下面先介绍一下这个类的一些重要字段</p> <ul><li><div class="language- line-numbers-mode"><pre class="language-text"><code>private List<QueryDataSet> dataSetList = new ArrayList<>(); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这个分片所生成的所有的 QueryDataSet</p></li> <li><div class="language- line-numbers-mode"><pre class="language-text"><code>private List<String> deviceIdList = new ArrayList<>(); |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>设备名列表，这个顺序与 dataSetList 的顺序一致，即 deviceIdList[i] 是 dataSetList[i] 的设备名.</p></li> <li><p>private int currentIndex = 0;</p> <p>当前正在被处理的 QueryDataSet 的下标</p></li></ul> <p>这个类在构造函数里，调用了<code>TSFRecordReader</code>的<code>initialize(TSFInputSplit, Configuration, IReaderSet, List<QueryDataSet>, List<String>)</code>方法去初始化上面提到的一些类字段。它覆写了<code>RecordReader</code>的<code>next()</code>方法，用以返回从 TsFile 里读出的数据。</p> <h5 id="next-nullwritable-mapwritable"><a href="#next-nullwritable-mapwritable" class="header-anchor">#</a> next(NullWritable, MapWritable)</h5> <p>我们注意到它从 TsFile 读取出来数据之后，是以<code>MapWritable</code>的形式返回的，这里的<code>MapWritable</code>其实就是一个<code>Map</code>，只不过它的 key 与 value 都做了序列化与反序列化的特殊适配，它的读取流程如下</p> <ol><li>首先判断<code>dataSetList</code>当前位置的<code>QueryDataSet</code>还有没有值，如果没有值，则将<code>currentIndex</code>递增1，直到找到第一个有值的<code>QueryDataSet</code></li> <li>然后调用<code>QueryDataSet</code>的<code>next()</code>方法获得<code>RowRecord</code></li> <li>最后调用<code>TSFRecordReader</code>的<code>getCurrentValue()</code>方法，将<code>RowRecord</code>中的值放入<code>MapWritable</code>里</li></ol> <h4 id="org-apache-iotdb-hive-tsfileserde"><a href="#org-apache-iotdb-hive-tsfileserde" class="header-anchor">#</a> org.apache.iotdb.hive.TsFileSerDe</h4> <p>这个类继承了<code>AbstractSerDe</code>，也是我们实现Hive从自定义输入格式中读取数据所必须的。</p> <p>它覆写了<code>AbstractSerDe</code>的<code>initialize()</code>方法，在这个方法里，从用户的建表 sql 里，解析出相应的设备名，传感器名以及传感器对应的类型。还要构建出<code>ObjectInspector</code>对象，这个对象主要负责数据类型的转化，由于 TsFile 只支持原始数据类型，所以当出现其他数据类型时，需要抛出异常，具体的构建过程在<code>createObjectInspectorWorker()</code>方法中可以看到。</p> <p>这个类的最主要职责就是序列化和反序列化不同文件格式的数据，由于我们的 Hive 连接器暂时只支持读取操作，并不支持 insert 操作，所以只有反序列化的过程，所以仅覆写了<code>deserialize(Writable)</code>方法，该方法里调用了<code>TsFileDeserializer</code>的<code>deserialize()</code>方法。</p> <h4 id="org-apache-iotdb-hive-tsfiledeserializer"><a href="#org-apache-iotdb-hive-tsfiledeserializer" class="header-anchor">#</a> org.apache.iotdb.hive.TsFileDeserializer</h4> <p>这个类就是将数据反序列化为 Hive 的输出格式，仅有一个<code>deserialize()</code>方法。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>public Object deserialize(List<String>, List<TypeInfo>, Writable, String) |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>这个方法的<code>Writable</code>参数就是<code>TSFHiveRecordReader</code>的<code>next()</code>生成的<code>MapWritable</code>。</p> <p>首先判断<code>Writable</code>参数是不是<code>MapWritable</code>类型，如果不是，则抛出异常。</p> <p>接着依次从<code>MapWritable</code>中取出该设备的传感器的值，如果遇到类型不匹配则抛异常，最后返回生成的结果集。</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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