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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 (V0.10.x)</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/V0.10.x/Ecosystem Integration/Grafana.html" class="sidebar-link">Grafana</a></li><li><a href="/UserGuide/V0.10.x/Ecosystem Integration/MapReduce TsFile.html" class="sidebar-link">MapReduce TsFile</a></li><li><a href="/UserGuide/V0.10.x/Ecosystem Integration/Spark TsFile.html" class="sidebar-link">Spark TsFile</a></li><li><a href="/UserGuide/V0.10.x/Ecosystem Integration/Spark IoTDB.html" class="sidebar-link">Spark IoTDB</a></li><li><a href="/UserGuide/V0.10.x/Ecosystem Integration/Hive TsFile.html" class="active 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></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="tsfile-hive-connector-user-guide"><a href="#tsfile-hive-connector-user-guide" class="header-anchor">#</a> TsFile-Hive-Connector User Guide</h1> <h2 id="outline"><a href="#outline" class="header-anchor">#</a> Outline</h2> <ul><li>TsFile-Hive-Connector User Guide |
| <ul><li>About TsFile-Hive-Connector</li> <li>System Requirements</li> <li>Data Type Correspondence</li> <li>Add Dependency For Hive</li> <li>Creating Tsfile-backed Hive tables</li> <li>Querying from Tsfile-backed Hive tables |
| <ul><li>Select Clause Example</li> <li>Aggregate Clause Example</li></ul></li> <li>What's Next</li></ul></li></ul> <h2 id="about-tsfile-hive-connector"><a href="#about-tsfile-hive-connector" class="header-anchor">#</a> About TsFile-Hive-Connector</h2> <p>TsFile-Hive-Connector implements the support of Hive for external data sources of Tsfile type. This enables users to operate Tsfile by Hive.</p> <p>With this connector, you can</p> <ul><li>Load a single TsFile, from either the local file system or hdfs, into hive</li> <li>Load all files in a specific directory, from either the local file system or hdfs, into hive</li> <li>Query the tsfile through HQL.</li> <li>As of now, the write operation is not supported in hive-connector. So, insert operation in HQL is not allowed while operating tsfile through hive.</li></ul> <h2 id="system-requirements"><a href="#system-requirements" class="header-anchor">#</a> System Requirements</h2> <table><thead><tr><th>Hadoop Version</th> <th>Hive Version</th> <th>Java Version</th> <th>TsFile</th></tr></thead> <tbody><tr><td><code>2.7.3</code> or <code>3.2.1</code></td> <td><code>2.3.6</code> or <code>3.1.2</code></td> <td><code>1.8</code></td> <td><code>0.10.0</code></td></tr></tbody></table> <blockquote><p>Note: For more information about how to download and use TsFile, please see the following link: https://github.com/apache/incubator-iotdb/tree/master/tsfile.</p></blockquote> <h2 id="data-type-correspondence"><a href="#data-type-correspondence" class="header-anchor">#</a> Data Type Correspondence</h2> <table><thead><tr><th>TsFile data type</th> <th>Hive field type</th></tr></thead> <tbody><tr><td>BOOLEAN</td> <td>Boolean</td></tr> <tr><td>INT32</td> <td>INT</td></tr> <tr><td>INT64</td> <td>BIGINT</td></tr> <tr><td>FLOAT</td> <td>Float</td></tr> <tr><td>DOUBLE</td> <td>Double</td></tr> <tr><td>TEXT</td> <td>STRING</td></tr></tbody></table> <h2 id="add-dependency-for-hive"><a href="#add-dependency-for-hive" class="header-anchor">#</a> Add Dependency For Hive</h2> <p>To use hive-connector in hive, we should add the hive-connector jar into hive.</p> <p>After downloading the code of iotdb from <a href="https://github.com/apache/incubator-iotdb" target="_blank" rel="noopener noreferrer">https://github.com/apache/incubator-iotdb<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>, you can use the command of <code>mvn clean package -pl hive-connector -am -Dmaven.test.skip=true</code> to get a <code>hive-connector-X.X.X-jar-with-dependencies.jar</code>.</p> <p>Then in hive, use the command of <code>add jar XXX</code> to add the dependency. For example:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>hive> add jar /Users/hive/incubator-iotdb/hive-connector/target/hive-connector-0.10.1-jar-with-dependencies.jar; |
| |
| Added [/Users/hive/incubator-iotdb/hive-connector/target/hive-connector-0.10.1-jar-with-dependencies.jar] to class path |
| Added resources: [/Users/hive/incubator-iotdb/hive-connector/target/hive-connector-0.10.1-jar-with-dependencies.jar] |
| </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="creating-tsfile-backed-hive-tables"><a href="#creating-tsfile-backed-hive-tables" class="header-anchor">#</a> Creating Tsfile-backed Hive tables</h2> <p>To create a Tsfile-backed table, specify the <code>serde</code> as <code>org.apache.iotdb.hive.TsFileSerDe</code>, |
| specify the <code>inputformat</code> as <code>org.apache.iotdb.hive.TSFHiveInputFormat</code>, |
| and the <code>outputformat</code> as <code>org.apache.iotdb.hive.TSFHiveOutputFormat</code>.</p> <p>Also provide a schema which only contains two fields: <code>time_stamp</code> and <code>sensor_id</code> for the table. |
| <code>time_stamp</code> is the time value of the time series |
| and <code>sensor_id</code> is the name of the sensor you want to extract from the tsfile to hive such as <code>sensor_1</code>. |
| The name of the table can be any valid tables names in hive.</p> <p>Also provide a location from which hive-connector will pull the most current data for the table.</p> <p>The location must be a specific directory, it can be on your local file system or HDFS if you have set up Hadoop. |
| If it is in your local file system, the location should look like <code>file:///data/data/sequence/root.baic2.WWS.leftfrontdoor/</code></p> <p>At last, you should set the <code>device_id</code> in <code>TBLPROPERTIES</code> to the device name you want to analyze.</p> <p>For example:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>CREATE EXTERNAL TABLE IF NOT EXISTS only_sensor_1( |
| time_stamp TIMESTAMP, |
| sensor_1 BIGINT) |
| ROW FORMAT SERDE 'org.apache.iotdb.hive.TsFileSerDe' |
| STORED AS |
| INPUTFORMAT 'org.apache.iotdb.hive.TSFHiveInputFormat' |
| OUTPUTFORMAT 'org.apache.iotdb.hive.TSFHiveOutputFormat' |
| LOCATION '/data/data/sequence/root.baic2.WWS.leftfrontdoor/' |
| TBLPROPERTIES ('device_id'='root.baic2.WWS.leftfrontdoor.plc1'); |
| </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><p>In this example we're pulling the data of <code>root.baic2.WWS.leftfrontdoor.plc1.sensor_1</code> from the directory of <code>/data/data/sequence/root.baic2.WWS.leftfrontdoor/</code>. |
| This table might result in a description as below:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>hive> describe only_sensor_1; |
| OK |
| time_stamp timestamp from deserializer |
| sensor_1 bigint from deserializer |
| Time taken: 0.053 seconds, Fetched: 2 row(s) |
| </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><p>At this point, the Tsfile-backed table can be worked with in Hive like any other table.</p> <h2 id="querying-from-tsfile-backed-hive-tables"><a href="#querying-from-tsfile-backed-hive-tables" class="header-anchor">#</a> Querying from Tsfile-backed Hive tables</h2> <p>Before we do any queries, we should set the <code>hive.input.format</code> in hive by executing the following command.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>hive> set hive.input.format=org.apache.hadoop.hive.ql.io.HiveInputFormat; |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Now, we already have an external table named <code>only_sensor_1</code> in hive. |
| We can use any query operations through HQL to analyse it.</p> <p>For example:</p> <h3 id="select-clause-example"><a href="#select-clause-example" class="header-anchor">#</a> Select Clause Example</h3> <div class="language- line-numbers-mode"><pre class="language-text"><code>hive> select * from only_sensor_1 limit 10; |
| OK |
| 1 1000000 |
| 2 1000001 |
| 3 1000002 |
| 4 1000003 |
| 5 1000004 |
| 6 1000005 |
| 7 1000006 |
| 8 1000007 |
| 9 1000008 |
| 10 1000009 |
| Time taken: 1.464 seconds, Fetched: 10 row(s) |
| </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></div></div><h3 id="aggregate-clause-example"><a href="#aggregate-clause-example" class="header-anchor">#</a> Aggregate Clause Example</h3> <div class="language- line-numbers-mode"><pre class="language-text"><code>hive> select count(*) from only_sensor_1; |
| WARNING: Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases. |
| Query ID = jackietien_20191016202416_d1e3e233-d367-4453-b39a-2aac9327a3b6 |
| Total jobs = 1 |
| Launching Job 1 out of 1 |
| Number of reduce tasks determined at compile time: 1 |
| In order to change the average load for a reducer (in bytes): |
| set hive.exec.reducers.bytes.per.reducer=<number> |
| In order to limit the maximum number of reducers: |
| set hive.exec.reducers.max=<number> |
| In order to set a constant number of reducers: |
| set mapreduce.job.reduces=<number> |
| Job running in-process (local Hadoop) |
| 2019-10-16 20:24:18,305 Stage-1 map = 0%, reduce = 0% |
| 2019-10-16 20:24:27,443 Stage-1 map = 100%, reduce = 100% |
| Ended Job = job_local867757288_0002 |
| MapReduce Jobs Launched: |
| Stage-Stage-1: HDFS Read: 0 HDFS Write: 0 SUCCESS |
| Total MapReduce CPU Time Spent: 0 msec |
| OK |
| 1000000 |
| Time taken: 11.334 seconds, Fetched: 1 row(s) |
| </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></div></div><h2 id="what-s-next"><a href="#what-s-next" class="header-anchor">#</a> What's Next</h2> <p>We're currently only supporting read operation. |
| Writing tables to Tsfiles is under development.</p></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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