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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>IoTDB User Guide (V0.9.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>0-Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>1-Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>2-Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>3-Server</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>4-Client</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>5-Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>6-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>7-Ecosystem Integration</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.9.x/7-Ecosystem Integration/1-Grafana.html" class="sidebar-link">Grafana</a></li><li><a href="/UserGuide/V0.9.x/7-Ecosystem Integration/2-MapReduce TsFile.html" class="sidebar-link">MapReduce TsFile</a></li><li><a href="/UserGuide/V0.9.x/7-Ecosystem Integration/3-Spark TsFile.html" class="sidebar-link">Spark TsFile</a></li><li><a href="/UserGuide/V0.9.x/7-Ecosystem Integration/4-Spark IoTDB.html" class="sidebar-link">Spark IoTDB</a></li><li><a href="/UserGuide/V0.9.x/7-Ecosystem Integration/5-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>8-System Design</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="hive-tsfile"><a href="#hive-tsfile" class="header-anchor">#</a> Hive TsFile</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> <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="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>0.9.3</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&gt; add jar /Users/hive/incubator-iotdb/hive-connector/target/hive-connector-0.9.3-jar-with-dependencies.jar;

Added [/Users/hive/incubator-iotdb/hive-connector/target/hive-connector-0.9.3-jar-with-dependencies.jar] to class path
Added resources: [/Users/hive/incubator-iotdb/hive-connector/target/hive-connector-0.9.3-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&gt; 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&gt; 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&gt; 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&gt; 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=&lt;number&gt;
In order to limit the maximum number of reducers:
  set hive.exec.reducers.max=&lt;number&gt;
In order to set a constant number of reducers:
  set mapreduce.job.reduces=&lt;number&gt;
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.
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