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| gitHub |
| <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>IoTDB User Guide (In progress)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Server</span> <span class="arrow right"></span></p> <!----></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><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>System Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Ecosystem Integration</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/Master/Ecosystem Integration/Grafana.html" class="sidebar-link">Grafana</a></li><li><a href="/UserGuide/Master/Ecosystem Integration/MapReduce TsFile.html" class="sidebar-link">MapReduce TsFile</a></li><li><a href="/UserGuide/Master/Ecosystem Integration/Spark TsFile.html" class="sidebar-link">Spark TsFile</a></li><li><a href="/UserGuide/Master/Ecosystem Integration/Spark IoTDB.html" class="active sidebar-link">Spark IoTDB</a></li><li><a href="/UserGuide/Master/Ecosystem Integration/Hive TsFile.html" class="sidebar-link">Hive TsFile</a></li></ul></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>Comparison with TSDBs</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="spark-iotdb-connecter"><a href="#spark-iotdb-connecter" class="header-anchor">#</a> Spark IoTDB Connecter</h1> <h2 id="version"><a href="#version" class="header-anchor">#</a> version</h2> <p>The versions required for Spark and Java are as follow:</p> <table><thead><tr><th style="text-align:center;">Spark Version</th> <th style="text-align:center;">Scala Version</th> <th style="text-align:center;">Java Version</th> <th style="text-align:center;">TsFile</th></tr></thead> <tbody><tr><td style="text-align:center;"><code>2.4.3</code></td> <td style="text-align:center;"><code>2.11</code></td> <td style="text-align:center;"><code>1.8</code></td> <td style="text-align:center;"><code>0.10.0</code></td></tr></tbody></table> <h2 id="install"><a href="#install" class="header-anchor">#</a> install</h2> <p>mvn clean scala:compile compile install</p> <h1 id="_1-maven-dependency"><a href="#_1-maven-dependency" class="header-anchor">#</a> 1. maven dependency</h1> <div class="language- line-numbers-mode"><pre class="language-text"><code> <dependency> |
| <groupId>org.apache.iotdb</groupId> |
| <artifactId>spark-iotdb-connector</artifactId> |
| <version>0.10.0</version> |
| </dependency> |
| </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></div></div><h1 id="_2-spark-shell-user-guide"><a href="#_2-spark-shell-user-guide" class="header-anchor">#</a> 2. spark-shell user guide</h1> <div class="language- line-numbers-mode"><pre class="language-text"><code>spark-shell --jars spark-iotdb-connector-0.10.0.jar,iotdb-jdbc-0.10.0-jar-with-dependencies.jar |
| |
| import org.apache.iotdb.spark.db._ |
| |
| val df = spark.read.format("org.apache.iotdb.spark.db").option("url","jdbc:iotdb://127.0.0.1:6667/").option("sql","select * from root").load |
| |
| df.printSchema() |
| |
| df.show() |
| </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></div></div><h3 id="to-partition-rdd"><a href="#to-partition-rdd" class="header-anchor">#</a> To partition rdd:</h3> <div class="language- line-numbers-mode"><pre class="language-text"><code>spark-shell --jars spark-iotdb-connector-0.10.0.jar,iotdb-jdbc-0.10.0-jar-with-dependencies.jar |
| |
| import org.apache.iotdb.spark.db._ |
| |
| val df = spark.read.format("org.apache.iotdb.spark.db").option("url","jdbc:iotdb://127.0.0.1:6667/").option("sql","select * from root"). |
| option("lowerBound", [lower bound of time that you want query(include)]).option("upperBound", [upper bound of time that you want query(include)]). |
| option("numPartition", [the partition number you want]).load |
| |
| df.printSchema() |
| |
| df.show() |
| </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><span class="line-number">11</span><br></div></div><h1 id="_3-schema-inference"><a href="#_3-schema-inference" class="header-anchor">#</a> 3. Schema Inference</h1> <p>Take the following TsFile structure as an example: There are three Measurements in the TsFile schema: status, temperature, and hardware. The basic information of these three measurements is as follows:</p> <table><thead><tr><th>Name</th> <th>Type</th> <th>Encode</th></tr></thead> <tbody><tr><td>status</td> <td>Boolean</td> <td>PLAIN</td></tr> <tr><td>temperature</td> <td>Float</td> <td>RLE</td></tr> <tr><td>hardware</td> <td>Text</td> <td>PLAIN</td></tr></tbody></table> <p>The existing data in the TsFile is as follows:</p> <img width="517" alt="SI " src="https://user-images.githubusercontent.com/69114052/98197835-99a64980-1f62-11eb-84af-8301b8a6aad5.png"> <p>The wide(default) table form is as follows:</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>You can also use narrow table form which as follows: (You can see part 4 about how to use narrow form)</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> <h1 id="_4-transform-between-wide-and-narrow-table"><a href="#_4-transform-between-wide-and-narrow-table" class="header-anchor">#</a> 4. Transform between wide and narrow table</h1> <h2 id="from-wide-to-narrow"><a href="#from-wide-to-narrow" class="header-anchor">#</a> from wide to narrow</h2> <div class="language- line-numbers-mode"><pre class="language-text"><code>import org.apache.iotdb.spark.db._ |
| |
| val wide_df = spark.read.format("org.apache.iotdb.spark.db").option("url", "jdbc:iotdb://127.0.0.1:6667/").option("sql", "select * from root where time < 1100 and time > 1000").load |
| val narrow_df = Transformer.toNarrowForm(spark, wide_df) |
| </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></div></div><h2 id="from-narrow-to-wide"><a href="#from-narrow-to-wide" class="header-anchor">#</a> from narrow to wide</h2> <div class="language- line-numbers-mode"><pre class="language-text"><code>import org.apache.iotdb.spark.db._ |
| |
| val wide_df = Transformer.toWideForm(spark, narrow_df) |
| </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></div></div><h1 id="_5-java-user-guide"><a href="#_5-java-user-guide" class="header-anchor">#</a> 5. Java user guide</h1> <div class="language- line-numbers-mode"><pre class="language-text"><code>import org.apache.spark.sql.Dataset; |
| import org.apache.spark.sql.Row; |
| import org.apache.spark.sql.SparkSession; |
| import org.apache.iotdb.spark.db.* |
| |
| public class Example { |
| |
| public static void main(String[] args) { |
| SparkSession spark = SparkSession |
| .builder() |
| .appName("Build a DataFrame from Scratch") |
| .master("local[*]") |
| .getOrCreate(); |
| |
| Dataset<Row> df = spark.read().format("org.apache.iotdb.spark.db") |
| .option("url","jdbc:iotdb://127.0.0.1:6667/") |
| .option("sql","select * from root").load(); |
| |
| df.printSchema(); |
| |
| df.show(); |
| |
| Dataset<Row> narrowTable = Transformer.toNarrowForm(spark, df) |
| narrowTable.show() |
| } |
| } |
| </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><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br></div></div></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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