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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>System design</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Architecture</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>QueryEngine</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>SchemaManager</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>StorageEngine</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>DataQuery</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Connector</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/SystemDesign/Connector/Hive-TsFile.html" class="sidebar-link">Hive-TsFile</a></li><li><a href="/SystemDesign/Connector/Spark-TsFile.html" aria-current="page" class="active sidebar-link">Spark-TsFile</a></li><li><a href="/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>Client</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="spark-tsfile-connector"><a href="#spark-tsfile-connector" class="header-anchor">#</a> Spark Tsfile connector</h1> <h2 id="aim-of-design"><a href="#aim-of-design" class="header-anchor">#</a> aim of design</h2> <ul><li><p>Use Spark SQL to read the data of the specified Tsfile and return it to the client in the form of a Spark DataFrame</p></li> <li><p>Generate Tsfile with data from Spark Dataframe</p></li></ul> <h2 id="supported-formats"><a href="#supported-formats" class="header-anchor">#</a> Supported formats</h2> <p>Wide table structure: Tsfile native format, IOTDB native path format</p> <table><thead><tr><th>time</th> <th>root.ln.wf02.wt02.temperature</th> <th>root.ln.wf02.wt02.status</th> <th>root.ln.wf02.wt02.hardware</th> <th>root.ln.wf01.wt01.temperature</th> <th>root.ln.wf01.wt01.status</th> <th>root.ln.wf01.wt01.hardware</th></tr></thead> <tbody><tr><td>1</td> <td>null</td> <td>true</td> <td>null</td> <td>2.2</td> <td>true</td> <td>null</td></tr> <tr><td>2</td> <td>null</td> <td>false</td> <td>aaa</td> <td>2.2</td> <td>null</td> <td>null</td></tr> <tr><td>3</td> <td>null</td> <td>null</td> <td>null</td> <td>2.1</td> <td>true</td> <td>null</td></tr> <tr><td>4</td> <td>null</td> <td>true</td> <td>bbb</td> <td>null</td> <td>null</td> <td>null</td></tr> <tr><td>5</td> <td>null</td> <td>null</td> <td>null</td> <td>null</td> <td>false</td> <td>null</td></tr> <tr><td>6</td> <td>null</td> <td>null</td> <td>ccc</td> <td>null</td> <td>null</td> <td>null</td></tr></tbody></table> <p>Narrow table structure: Relational database schema, IOTDB align by device format</p> <table><thead><tr><th>time</th> <th>device_name</th> <th>status</th> <th>hardware</th> <th>temperature</th></tr></thead> <tbody><tr><td>1</td> <td>root.ln.wf02.wt01</td> <td>true</td> <td>null</td> <td>2.2</td></tr> <tr><td>1</td> <td>root.ln.wf02.wt02</td> <td>true</td> <td>null</td> <td>null</td></tr> <tr><td>2</td> <td>root.ln.wf02.wt01</td> <td>null</td> <td>null</td> <td>2.2</td></tr> <tr><td>2</td> <td>root.ln.wf02.wt02</td> <td>false</td> <td>aaa</td> <td>null</td></tr> <tr><td>3</td> <td>root.ln.wf02.wt01</td> <td>true</td> <td>null</td> <td>2.1</td></tr> <tr><td>4</td> <td>root.ln.wf02.wt02</td> <td>true</td> <td>bbb</td> <td>null</td></tr> <tr><td>5</td> <td>root.ln.wf02.wt01</td> <td>false</td> <td>null</td> <td>null</td></tr> <tr><td>6</td> <td>root.ln.wf02.wt02</td> <td>null</td> <td>ccc</td> <td>null</td></tr></tbody></table> <h2 id="query-process-steps"><a href="#query-process-steps" class="header-anchor">#</a> Query process steps</h2> <h4 id="_1-table-structure-inference-and-generation"><a href="#_1-table-structure-inference-and-generation" class="header-anchor">#</a> 1. Table structure inference and generation</h4> <p>This step is to make the table structure of the DataFrame match the table structure of the Tsfile to be queried. |
| The main logic is inferSchema function in src / main / scala / org / apache / iotdb / spark / tsfile / DefaultSource.scala</p> <h4 id="_2-sql-parsing"><a href="#_2-sql-parsing" class="header-anchor">#</a> 2. SQL parsing</h4> <p>The purpose of this step is to transform user SQL statements into Tsfile native query expressions.</p> <p>The main logic is the buildReader function in src / main / scala / org / apache / iotdb / spark / tsfile / DefaultSource.scala. SQL parsing wide table structure and narrow table structure</p> <h4 id="_3-wide-table-structure"><a href="#_3-wide-table-structure" class="header-anchor">#</a> 3. Wide table structure</h4> <p>The main logic of the SQL analysis of the wide table structure is in src / main / scala / org / apache / iotdb / spark / tsfile / WideConverter.scala. This structure is basically the same as the Tsfile native query structure. No special processing is required, and the SQL statement is directly converted into Corresponding query expression</p> <h4 id="_4-narrow-table-structure"><a href="#_4-narrow-table-structure" class="header-anchor">#</a> 4. Narrow table structure</h4> <p>The main logic of the SQL analysis of the wide table structure is src / main / scala / org / apache / iotdb / spark / tsfile / NarrowConverter.scala.</p> <p>Firstly we use required schema to decide which timeseries we should get from time file</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>requiredSchema.foreach((field: StructField) => { |
| if (field.name != QueryConstant.RESERVED_TIME |
| && field.name != NarrowConverter.DEVICE_NAME) { |
| measurementNames += field.name |
| } |
| }) |
| </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></div></div><p>After the SQL is converted to an expression, the narrow table structure is different from the Tsfile native query structure. The expression is converted into a disjunction expression related to the device before it can be converted into a query of Tsfile. The conversion code is in src / main / java / org / apache / iotdb / spark / tsfile / qp</p> <p>example：</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>select time, device_name, s1 from tsfile_table where time > 1588953600000 and time < 1589040000000 and device_name = 'root.group1.d1' |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Obviously we only need timeseries 'root.group1.d1.s1' and our expression is [time > 1588953600000] and [time < 1589040000000]</p> <h4 id="_5-query-execution"><a href="#_5-query-execution" class="header-anchor">#</a> 5. Query execution</h4> <p>The actual data query execution is performed by the Tsfile native component, see:</p> <ul><li><a href="/SystemDesign/TsFile/Read.html">Tsfile native query process</a></li></ul> <h2 id="write-step-flow"><a href="#write-step-flow" class="header-anchor">#</a> Write step flow</h2> <p>Writing is mainly to convert the data in the Dataframe structure into Tsfile's RowRecord, and write using Tsfile Writer</p> <h4 id="wide-table-structure"><a href="#wide-table-structure" class="header-anchor">#</a> Wide table structure</h4> <p>The main conversion code is in the following two files:</p> <ul><li><p>src/main/scala/org/apache/iotdb/spark/tsfile/WideConverter.scala responsible for structural transformation</p></li> <li><p>src/main/scala/org/apache/iotdb/spark/tsfile/WideTsFileOutputWriter.scala responsible for matching the spark interface and performing writes, which will call the structure conversion function in the previous file</p></li></ul> <h4 id="narrow-table-structure"><a href="#narrow-table-structure" class="header-anchor">#</a> Narrow table structure</h4> <p>The main conversion code is in the following two files:</p> <ul><li><p>src/main/scala/org/apache/iotdb/spark/tsfile/NarrowConverter.scala responsible for structural transformation</p></li> <li><p>src/main/scala/org/apache/iotdb/spark/tsfile/NarrowTsFileOutputWriter.scala responsible for matching the spark interface and performing writes, which will call the structure conversion function in the previous file</p></li></ul></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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