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| Design |
| <!----></a></div><div class="nav-item"><a href="/Download/" class="nav-link">Download</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Community</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Community/About.html" class="nav-link">About</a></li><li class="dropdown-item"><!----> <a href="https://cwiki.apache.org/confluence/display/iotdb" class="nav-link external"> |
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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 (latest)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>IoTDB Introduction</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Quick Start</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Data Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Syntax Conventions</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>API</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.13.x/API/Programming-Java-Native-API.html" aria-current="page" class="active sidebar-link">Java Native API</a></li><li><a href="/UserGuide/V0.13.x/API/Programming-Python-Native-API.html" class="sidebar-link">Python Native API</a></li><li><a href="/UserGuide/V0.13.x/API/Programming-Cpp-Native-API.html" class="sidebar-link">C++ Native API</a></li><li><a href="/UserGuide/V0.13.x/API/Programming-Go-Native-API.html" class="sidebar-link">Go Native API</a></li><li><a href="/UserGuide/V0.13.x/API/Programming-JDBC.html" class="sidebar-link">JDBC (Not Recommend)</a></li><li><a href="/UserGuide/V0.13.x/API/Programming-MQTT.html" class="sidebar-link">MQTT</a></li><li><a href="/UserGuide/V0.13.x/API/RestService.html" class="sidebar-link">REST API</a></li><li><a href="/UserGuide/V0.13.x/API/Programming-TsFile-API.html" class="sidebar-link">TsFile API</a></li><li><a href="/UserGuide/V0.13.x/API/Status-Codes.html" class="sidebar-link">Status Codes</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Operate Metadata</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Write and Delete Data</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Query Data</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Process Data</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Administration Management</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Maintenance Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Ecosystem Integration</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Cluster Setup</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>UDF Library</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Reference</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="java-native-api"><a href="#java-native-api" class="header-anchor">#</a> Java Native API</h1> <h2 id="installation"><a href="#installation" class="header-anchor">#</a> Installation</h2> <h3 id="dependencies"><a href="#dependencies" class="header-anchor">#</a> Dependencies</h3> <ul><li>JDK >= 1.8</li> <li>Maven >= 3.6</li></ul> <h3 id="how-to-install"><a href="#how-to-install" class="header-anchor">#</a> How to install</h3> <p>In root directory:</p> <blockquote><p>mvn clean install -pl session -am -DskipTests</p></blockquote> <h3 id="using-iotdb-java-native-api-with-maven"><a href="#using-iotdb-java-native-api-with-maven" class="header-anchor">#</a> Using IoTDB Java Native API with Maven</h3> <div class="language-xml line-numbers-mode"><pre class="language-xml"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dependencies</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dependency</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>groupId</span><span class="token punctuation">></span></span>org.apache.iotdb<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>groupId</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>artifactId</span><span class="token punctuation">></span></span>iotdb-session<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>artifactId</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>version</span><span class="token punctuation">></span></span>0.13.0-SNAPSHOT<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>version</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependency</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependencies</span><span class="token punctuation">></span></span> |
| </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></div></div><h2 id="syntax-description"><a href="#syntax-description" class="header-anchor">#</a> Syntax Description</h2> <ul><li><strong>IoTDB-SQL interface:</strong> The input SQL parameter needs to conform to the <a href="/UserGuide/V0.13.x/Reference/Syntax-Conventions.html">syntax conventions</a> and be escaped for JAVA strings. For example, you need to add a backslash before the double-quotes. (That is: after JAVA escaping, it is consistent with the SQL statement executed on the command line.)</li> <li><strong>Other interfaces:</strong> <ul><li>The node names in path or path prefix as parameter: |
| <ul><li>The node names which should be escaped by backticks (`) in the SQL statement, and escaping is not required here.</li> <li>The node names enclosed in single or double quotes still need to be enclosed in single or double quotes and must be escaped for JAVA strings.</li> <li>For the <code>checkTimeseriesExists</code> interface, since the IoTDB-SQL interface is called internally, the time-series pathname must be consistent with the SQL syntax conventions and be escaped for JAVA strings.</li></ul></li> <li>Identifiers (such as template names) as parameters: The identifiers which should be escaped by backticks (`) in the SQL statement, and escaping is not required here.</li></ul></li></ul> <h2 id="native-apis"><a href="#native-apis" class="header-anchor">#</a> Native APIs</h2> <p>Here we show the commonly used interfaces and their parameters in the Native API:</p> <h3 id="initialization"><a href="#initialization" class="header-anchor">#</a> Initialization</h3> <ul><li>Initialize a Session</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">// use default configuration </span> |
| session <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Session<span class="token punctuation">.</span>Builder</span><span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// initialize with a single node</span> |
| session <span class="token operator">=</span> |
| <span class="token keyword">new</span> <span class="token class-name">Session<span class="token punctuation">.</span>Builder</span><span class="token punctuation">(</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">host</span><span class="token punctuation">(</span><span class="token class-name">String</span> host<span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">port</span><span class="token punctuation">(</span><span class="token keyword">int</span> port<span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// initialize with multiple nodes</span> |
| session <span class="token operator">=</span> |
| <span class="token keyword">new</span> <span class="token class-name">Session<span class="token punctuation">.</span>Builder</span><span class="token punctuation">(</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">nodeUrls</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> nodeUrls<span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// other configurations</span> |
| session <span class="token operator">=</span> |
| <span class="token keyword">new</span> <span class="token class-name">Session<span class="token punctuation">.</span>Builder</span><span class="token punctuation">(</span><span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">fetchSize</span><span class="token punctuation">(</span><span class="token keyword">int</span> fetchSize<span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">username</span><span class="token punctuation">(</span><span class="token class-name">String</span> username<span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">password</span><span class="token punctuation">(</span><span class="token class-name">String</span> password<span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">thriftDefaultBufferSize</span><span class="token punctuation">(</span><span class="token keyword">int</span> thriftDefaultBufferSize<span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">thriftMaxFrameSize</span><span class="token punctuation">(</span><span class="token keyword">int</span> thriftMaxFrameSize<span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">enableCacheLeader</span><span class="token punctuation">(</span><span class="token keyword">boolean</span> enableCacheLeader<span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">version</span><span class="token punctuation">(</span><span class="token class-name">Version</span> version<span class="token punctuation">)</span> |
| <span class="token punctuation">.</span><span class="token function">build</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </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><span class="line-number">27</span><br></div></div><p>Version represents the SQL semantic version used by the client, which is used to be compatible with the SQL semantics of 0.12 when upgrading 0.13. The possible values are: <code>V_0_12</code>, <code>V_0_13</code>.</p> <ul><li>Open a Session</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token keyword">open</span><span class="token punctuation">(</span><span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>Open a session, with a parameter to specify whether to enable RPC compression</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token keyword">open</span><span class="token punctuation">(</span><span class="token keyword">boolean</span> enableRPCCompression<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Notice: this RPC compression status of client must comply with that of IoTDB server</p> <ul><li>Close a Session</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="data-definition-interface-ddl-interface"><a href="#data-definition-interface-ddl-interface" class="header-anchor">#</a> Data Definition Interface (DDL Interface)</h3> <h4 id="storage-group-management"><a href="#storage-group-management" class="header-anchor">#</a> Storage Group Management</h4> <ul><li>Set storage group</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">setStorageGroup</span><span class="token punctuation">(</span><span class="token class-name">String</span> storageGroupId<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>Delete one or several storage groups</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">deleteStorageGroup</span><span class="token punctuation">(</span><span class="token class-name">String</span> storageGroup<span class="token punctuation">)</span> |
| <span class="token keyword">void</span> <span class="token function">deleteStorageGroups</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> storageGroups<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h4 id="timeseries-management"><a href="#timeseries-management" class="header-anchor">#</a> Timeseries Management</h4> <ul><li>Create one or multiple timeseries</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">createTimeseries</span><span class="token punctuation">(</span><span class="token class-name">String</span> path<span class="token punctuation">,</span> <span class="token class-name">TSDataType</span> dataType<span class="token punctuation">,</span> |
| <span class="token class-name">TSEncoding</span> encoding<span class="token punctuation">,</span> <span class="token class-name">CompressionType</span> compressor<span class="token punctuation">,</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">></span></span> props<span class="token punctuation">,</span> |
| <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">></span></span> tags<span class="token punctuation">,</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">></span></span> attributes<span class="token punctuation">,</span> <span class="token class-name">String</span> measurementAlias<span class="token punctuation">)</span> |
| |
| <span class="token keyword">void</span> <span class="token function">createMultiTimeseries</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> paths<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">TSDataType</span><span class="token punctuation">></span></span> dataTypes<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">TSEncoding</span><span class="token punctuation">></span></span> encodings<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">CompressionType</span><span class="token punctuation">></span></span> compressors<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Map</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">></span><span class="token punctuation">></span></span> propsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Map</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">></span><span class="token punctuation">></span></span> tagsList<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Map</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">String</span><span class="token punctuation">></span><span class="token punctuation">></span></span> attributesList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> measurementAliasList<span class="token punctuation">)</span> |
| </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></div></div><ul><li>Create aligned timeseries</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>void createAlignedTimeseries(String prefixPath, List<String> measurements, |
| List<TSDataType> dataTypes, List<TSEncoding> encodings, |
| CompressionType compressor, List<String> measurementAliasList); |
| </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><p>Attention: Alias of measurements are <strong>not supported</strong> currently.</p> <ul><li>Delete one or several timeseries</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">deleteTimeseries</span><span class="token punctuation">(</span><span class="token class-name">String</span> path<span class="token punctuation">)</span> |
| <span class="token keyword">void</span> <span class="token function">deleteTimeseries</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> paths<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><ul><li>Check whether the specific timeseries exists.</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">boolean</span> <span class="token function">checkTimeseriesExists</span><span class="token punctuation">(</span><span class="token class-name">String</span> path<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h4 id="schema-template"><a href="#schema-template" class="header-anchor">#</a> Schema Template</h4> <p>Create a schema template for massive identical devices will help to improve memory performance. You can use Template, InternalNode and MeasurementNode to depict the structure of the template, and use belowed interface to create it inside session.</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">createSchemaTemplate</span><span class="token punctuation">(</span><span class="token class-name">Template</span> template<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token class-name">Class</span> <span class="token class-name">Template</span> <span class="token punctuation">{</span> |
| <span class="token keyword">private</span> <span class="token class-name">String</span> name<span class="token punctuation">;</span> |
| <span class="token keyword">private</span> <span class="token keyword">boolean</span> directShareTime<span class="token punctuation">;</span> |
| <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Node</span><span class="token punctuation">></span></span> children<span class="token punctuation">;</span> |
| <span class="token keyword">public</span> <span class="token class-name">Template</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">,</span> <span class="token keyword">boolean</span> isShareTime<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addToTemplate</span><span class="token punctuation">(</span><span class="token class-name">Node</span> node<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">deleteFromTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">setShareTime</span><span class="token punctuation">(</span><span class="token keyword">boolean</span> shareTime<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| |
| <span class="token class-name">Abstract</span> <span class="token class-name">Class</span> <span class="token class-name">Node</span> <span class="token punctuation">{</span> |
| <span class="token keyword">private</span> <span class="token class-name">String</span> name<span class="token punctuation">;</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addChild</span><span class="token punctuation">(</span><span class="token class-name">Node</span> node<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">deleteChild</span><span class="token punctuation">(</span><span class="token class-name">Node</span> node<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| |
| <span class="token class-name">Class</span> <span class="token class-name">MeasurementNode</span> <span class="token keyword">extends</span> <span class="token class-name">Node</span> <span class="token punctuation">{</span> |
| <span class="token class-name">TSDataType</span> dataType<span class="token punctuation">;</span> |
| <span class="token class-name">TSEncoding</span> encoding<span class="token punctuation">;</span> |
| <span class="token class-name">CompressionType</span> compressor<span class="token punctuation">;</span> |
| <span class="token keyword">public</span> <span class="token class-name">MeasurementNode</span><span class="token punctuation">(</span><span class="token class-name">String</span> name<span class="token punctuation">,</span> |
| <span class="token class-name">TSDataType</span> dataType<span class="token punctuation">,</span> |
| <span class="token class-name">TSEncoding</span> encoding<span class="token punctuation">,</span> |
| <span class="token class-name">CompressionType</span> compressor<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| </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><span class="line-number">27</span><br><span class="line-number">28</span><br></div></div><p>We strongly suggest you implement templates only with flat-measurement (like object 'flatTemplate' in belowed snippet), since tree-structured template may not be a long-term supported feature in further version of IoTDB.</p> <p>A snippet of using above Method and Class：</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token class-name">MeasurementNode</span> nodeX <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MeasurementNode</span><span class="token punctuation">(</span><span class="token string">"x"</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>FLOAT<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>RLE<span class="token punctuation">,</span> <span class="token class-name">CompressionType</span><span class="token punctuation">.</span>SNAPPY<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">MeasurementNode</span> nodeY <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MeasurementNode</span><span class="token punctuation">(</span><span class="token string">"y"</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>FLOAT<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>RLE<span class="token punctuation">,</span> <span class="token class-name">CompressionType</span><span class="token punctuation">.</span>SNAPPY<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token class-name">MeasurementNode</span> nodeSpeed <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MeasurementNode</span><span class="token punctuation">(</span><span class="token string">"speed"</span><span class="token punctuation">,</span> <span class="token class-name">TSDataType</span><span class="token punctuation">.</span>DOUBLE<span class="token punctuation">,</span> <span class="token class-name">TSEncoding</span><span class="token punctuation">.</span>GORILLA<span class="token punctuation">,</span> <span class="token class-name">CompressionType</span><span class="token punctuation">.</span>SNAPPY<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// This is the template we suggest to implement</span> |
| <span class="token class-name">Template</span> flatTemplate <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Template</span><span class="token punctuation">(</span><span class="token string">"flatTemplate"</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| template<span class="token punctuation">.</span><span class="token function">addToTemplate</span><span class="token punctuation">(</span>nodeX<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| template<span class="token punctuation">.</span><span class="token function">addToTemplate</span><span class="token punctuation">(</span>nodeY<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| template<span class="token punctuation">.</span><span class="token function">addToTemplate</span><span class="token punctuation">(</span>nodeSpeed<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token function">createSchemaTemplate</span><span class="token punctuation">(</span>flatTemplate<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </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><p>After measurement template created, you can edit the template with belowed APIs.</p> <p>**Attention: **</p> <p><strong>1. templates had been set could not be pruned</strong></p> <p><strong>2. templates will be activated on one node by data points insertion of measurements within the template, or interface <code>createTimeseriesOfSchemaTemplate</code></strong></p> <p><strong>3. templates will not be shown by showtimeseries before activated</strong></p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">// Add aligned measurements to a template</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addAlignedMeasurementsInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> |
| <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> measurementsPath<span class="token punctuation">,</span> |
| <span class="token class-name">TSDataType</span><span class="token punctuation">[</span><span class="token punctuation">]</span> dataTypes<span class="token punctuation">,</span> |
| <span class="token class-name">TSEncoding</span><span class="token punctuation">[</span><span class="token punctuation">]</span> encodings<span class="token punctuation">,</span> |
| <span class="token class-name">CompressionType</span><span class="token punctuation">[</span><span class="token punctuation">]</span> compressors<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// Add one aligned measurement to a template</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addAlignedMeasurementInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> |
| <span class="token class-name">String</span> measurementPath<span class="token punctuation">,</span> |
| <span class="token class-name">TSDataType</span> dataType<span class="token punctuation">,</span> |
| <span class="token class-name">TSEncoding</span> encoding<span class="token punctuation">,</span> |
| <span class="token class-name">CompressionType</span> compressor<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| |
| <span class="token comment">// Add unaligned measurements to a template</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addUnalignedMeasurementInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> |
| <span class="token class-name">String</span> measurementPath<span class="token punctuation">,</span> |
| <span class="token class-name">TSDataType</span> dataType<span class="token punctuation">,</span> |
| <span class="token class-name">TSEncoding</span> encoding<span class="token punctuation">,</span> |
| <span class="token class-name">CompressionType</span> compressor<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// Add one unaligned measurement to a template</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">addUnalignedMeasurementsIntemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> |
| <span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> measurementPaths<span class="token punctuation">,</span> |
| <span class="token class-name">TSDataType</span><span class="token punctuation">[</span><span class="token punctuation">]</span> dataTypes<span class="token punctuation">,</span> |
| <span class="token class-name">TSEncoding</span><span class="token punctuation">[</span><span class="token punctuation">]</span> encodings<span class="token punctuation">,</span> |
| <span class="token class-name">CompressionType</span><span class="token punctuation">[</span><span class="token punctuation">]</span> compressors<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// Delete a node in template</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">deleteNodeInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> <span class="token class-name">String</span> path<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </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><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br></div></div><p>You can query measurement inside templates with these APIS:</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">// Return the amount of measurements inside a template</span> |
| <span class="token keyword">public</span> <span class="token keyword">int</span> <span class="token function">countMeasurementsInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// Return true if path points to a measurement, otherwise returne false</span> |
| <span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">isMeasurementInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> <span class="token class-name">String</span> path<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// Return true if path exists in template, otherwise return false</span> |
| <span class="token keyword">public</span> <span class="token keyword">boolean</span> <span class="token function">isPathExistInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> <span class="token class-name">String</span> path<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// Return all measurements paths inside template</span> |
| <span class="token keyword">public</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> <span class="token function">showMeasurementsInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">// Return all measurements paths under the designated patter inside template</span> |
| <span class="token keyword">public</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> <span class="token function">showMeasurementsInTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> <span class="token class-name">String</span> pattern<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </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></div></div><p>To implement schema template, you can set the template named <code>templateName</code> at path <code>prefixPath</code>.</p> <p><strong>Please notice that, we strongly recommend not setting templates on the nodes above the storage group to accommodate future updates and collaboration between modules.</strong></p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">setSchemaTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> <span class="token class-name">String</span> prefixPath<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Before setting template, you should first create the template using</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">createSchemaTemplate</span><span class="token punctuation">(</span><span class="token class-name">Template</span> template<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>After setting template to a certain path, you can query for info about template using belowed interface in session:</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">/** @return All template names. */</span> |
| <span class="token keyword">public</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> <span class="token function">showAllTemplates</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">/** @return All paths have been set to designated template. */</span> |
| <span class="token keyword">public</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> <span class="token function">showPathsTemplateSetOn</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| |
| <span class="token comment">/** @return All paths are using designated template. */</span> |
| <span class="token keyword">public</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> <span class="token function">showPathsTemplateUsingOn</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">)</span> |
| </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></div></div><p>If you are ready to get rid of schema template, you can drop it with belowed interface. Make sure the template to drop has been unset from MTree.</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">unsetSchemaTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> prefixPath<span class="token punctuation">,</span> <span class="token class-name">String</span> templateName<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">dropSchemaTemplate</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>Unset the measurement template named <code>templateName</code> from path <code>prefixPath</code>. When you issue this interface, you should assure that there is such a template set at the path.</p> <p>If the template had been activated on one node, you should deactivate from it using the interface:</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">deactivateTemplateOn</span><span class="token punctuation">(</span><span class="token class-name">String</span> templateName<span class="token punctuation">,</span> <span class="token class-name">String</span> prefixPath<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>The passing in <code>prefixPath</code> is a literal path without wildcard(<code>*</code>or<code>**</code>), or a PathPattern to denote paths match the pattern.</p> <p>The deactivation of the template will delete the data of the timeseries which is under the path of concatenation of path of the node and the measurements inside the activatede template.</p> <h3 id="data-manipulation-interface-dml-interface"><a href="#data-manipulation-interface-dml-interface" class="header-anchor">#</a> Data Manipulation Interface (DML Interface)</h3> <h5 id="insert"><a href="#insert" class="header-anchor">#</a> Insert</h5> <p>It is recommended to use insertTablet to help improve write efficiency.</p> <ul><li>Insert a Tablet，which is multiple rows of a device, each row has the same measurements |
| <ul><li><strong>Better Write Performance</strong></li> <li><strong>Support null values</strong>: fill the null value with any value, and then mark the null value via BitMap</li></ul></li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertTablet</span><span class="token punctuation">(</span><span class="token class-name">Tablet</span> tablet<span class="token punctuation">)</span> |
| |
| <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Tablet</span> <span class="token punctuation">{</span> |
| <span class="token comment">/** deviceId of this tablet */</span> |
| <span class="token keyword">public</span> <span class="token class-name">String</span> prefixPath<span class="token punctuation">;</span> |
| <span class="token comment">/** the list of measurement schemas for creating the tablet */</span> |
| <span class="token keyword">private</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">MeasurementSchema</span><span class="token punctuation">></span></span> schemas<span class="token punctuation">;</span> |
| <span class="token comment">/** timestamps in this tablet */</span> |
| <span class="token keyword">public</span> <span class="token keyword">long</span><span class="token punctuation">[</span><span class="token punctuation">]</span> timestamps<span class="token punctuation">;</span> |
| <span class="token comment">/** each object is a primitive type array, which represents values of one measurement */</span> |
| <span class="token keyword">public</span> <span class="token class-name">Object</span><span class="token punctuation">[</span><span class="token punctuation">]</span> values<span class="token punctuation">;</span> |
| <span class="token comment">/** each bitmap represents the existence of each value in the current column. */</span> |
| <span class="token keyword">public</span> <span class="token class-name">BitMap</span><span class="token punctuation">[</span><span class="token punctuation">]</span> bitMaps<span class="token punctuation">;</span> |
| <span class="token comment">/** the number of rows to include in this tablet */</span> |
| <span class="token keyword">public</span> <span class="token keyword">int</span> rowSize<span class="token punctuation">;</span> |
| <span class="token comment">/** the maximum number of rows for this tablet */</span> |
| <span class="token keyword">private</span> <span class="token keyword">int</span> maxRowNumber<span class="token punctuation">;</span> |
| <span class="token comment">/** whether this tablet store data of aligned timeseries or not */</span> |
| <span class="token keyword">private</span> <span class="token keyword">boolean</span> isAligned<span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| </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></div></div><ul><li>Insert multiple Tablets</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertTablets</span><span class="token punctuation">(</span><span class="token class-name">Map</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Tablet</span><span class="token punctuation">></span></span> tablet<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li><p>Insert a Record, which contains multiple measurement value of a device at a timestamp. This method is equivalent to providing a common interface for multiple data types of values. Later, the value can be cast to the original type through TSDataType.</p> <p>The correspondence between the Object type and the TSDataType type is shown in the following table.</p> <table><thead><tr><th>TSDataType</th> <th>Object</th></tr></thead> <tbody><tr><td>BOOLEAN</td> <td>Boolean</td></tr> <tr><td>INT32</td> <td>Integer</td></tr> <tr><td>INT64</td> <td>Long</td></tr> <tr><td>FLOAT</td> <td>Float</td></tr> <tr><td>DOUBLE</td> <td>Double</td></tr> <tr><td>TEXT</td> <td>String, Binary</td></tr></tbody></table></li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertRecord</span><span class="token punctuation">(</span><span class="token class-name">String</span> deviceId<span class="token punctuation">,</span> <span class="token keyword">long</span> time<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> measurements<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">TSDataType</span><span class="token punctuation">></span></span> types<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Object</span><span class="token punctuation">></span></span> values<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><ul><li>Insert multiple Records</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertRecords</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> deviceIds<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Long</span><span class="token punctuation">></span></span> times<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span><span class="token punctuation">></span></span> measurementsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">TSDataType</span><span class="token punctuation">></span><span class="token punctuation">></span></span> typesList<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">Object</span><span class="token punctuation">></span><span class="token punctuation">></span></span> valuesList<span class="token punctuation">)</span> |
| </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><ul><li>Insert multiple Records that belong to the same device. |
| With type info the server has no need to do type inference, which leads a better performance</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertRecordsOfOneDevice</span><span class="token punctuation">(</span><span class="token class-name">String</span> deviceId<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Long</span><span class="token punctuation">></span></span> times<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span><span class="token punctuation">></span></span> measurementsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">TSDataType</span><span class="token punctuation">></span><span class="token punctuation">></span></span> typesList<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">Object</span><span class="token punctuation">></span><span class="token punctuation">></span></span> valuesList<span class="token punctuation">)</span> |
| </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><h4 id="insert-with-type-inference"><a href="#insert-with-type-inference" class="header-anchor">#</a> Insert with type inference</h4> <p>When the data is of String type, we can use the following interface to perform type inference based on the value of the value itself. For example, if value is "true" , it can be automatically inferred to be a boolean type. If value is "3.2" , it can be automatically inferred as a flout type. Without type information, server has to do type inference, which may cost some time.</p> <ul><li>Insert a Record, which contains multiple measurement value of a device at a timestamp</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertRecord</span><span class="token punctuation">(</span><span class="token class-name">String</span> prefixPath<span class="token punctuation">,</span> <span class="token keyword">long</span> time<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> measurements<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> values<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>Insert multiple Records</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertRecords</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> deviceIds<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Long</span><span class="token punctuation">></span></span> times<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span><span class="token punctuation">></span></span> measurementsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span><span class="token punctuation">></span></span> valuesList<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><ul><li>Insert multiple Records that belong to the same device.</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">insertStringRecordsOfOneDevice</span><span class="token punctuation">(</span><span class="token class-name">String</span> deviceId<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Long</span><span class="token punctuation">></span></span> times<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span><span class="token punctuation">></span></span> measurementsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span><span class="token punctuation">></span></span> valuesList<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h4 id="insert-of-aligned-timeseries"><a href="#insert-of-aligned-timeseries" class="header-anchor">#</a> Insert of Aligned Timeseries</h4> <p>The Insert of aligned timeseries uses interfaces like insertAlignedXXX, and others are similar to the above interfaces:</p> <ul><li>insertAlignedRecord</li> <li>insertAlignedRecords</li> <li>insertAlignedRecordsOfOneDevice</li> <li>insertAlignedStringRecordsOfOneDevice</li> <li>insertAlignedTablet</li> <li>insertAlignedTablets</li></ul> <h4 id="delete"><a href="#delete" class="header-anchor">#</a> Delete</h4> <ul><li>Delete data before or equal to a timestamp of one or several timeseries</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">deleteData</span><span class="token punctuation">(</span><span class="token class-name">String</span> path<span class="token punctuation">,</span> <span class="token keyword">long</span> time<span class="token punctuation">)</span> |
| <span class="token keyword">void</span> <span class="token function">deleteData</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> paths<span class="token punctuation">,</span> <span class="token keyword">long</span> time<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h4 id="query"><a href="#query" class="header-anchor">#</a> Query</h4> <ul><li>Raw data query. Time interval include startTime and exclude endTime</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token class-name">SessionDataSet</span> <span class="token function">executeRawDataQuery</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> paths<span class="token punctuation">,</span> <span class="token keyword">long</span> startTime<span class="token punctuation">,</span> <span class="token keyword">long</span> endTime<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>Query the last data, whose timestamp is greater than or equal LastTime</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token class-name">SessionDataSet</span> <span class="token function">executeLastDataQuery</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> paths<span class="token punctuation">,</span> <span class="token keyword">long</span> <span class="token class-name">LastTime</span><span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="iotdb-sql-interface"><a href="#iotdb-sql-interface" class="header-anchor">#</a> IoTDB-SQL Interface</h3> <ul><li>Execute query statement</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token class-name">SessionDataSet</span> <span class="token function">executeQueryStatement</span><span class="token punctuation">(</span><span class="token class-name">String</span> sql<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>Execute non query statement</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">executeNonQueryStatement</span><span class="token punctuation">(</span><span class="token class-name">String</span> sql<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="write-test-interface-to-profile-network-cost"><a href="#write-test-interface-to-profile-network-cost" class="header-anchor">#</a> Write Test Interface (to profile network cost)</h3> <p>These methods <strong>don't</strong> insert data into database and server just return after accept the request.</p> <ul><li>Test the network and client cost of insertRecord</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">testInsertRecord</span><span class="token punctuation">(</span><span class="token class-name">String</span> deviceId<span class="token punctuation">,</span> <span class="token keyword">long</span> time<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> measurements<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> values<span class="token punctuation">)</span> |
| |
| <span class="token keyword">void</span> <span class="token function">testInsertRecord</span><span class="token punctuation">(</span><span class="token class-name">String</span> deviceId<span class="token punctuation">,</span> <span class="token keyword">long</span> time<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> measurements<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">TSDataType</span><span class="token punctuation">></span></span> types<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Object</span><span class="token punctuation">></span></span> values<span class="token punctuation">)</span> |
| </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><ul><li>Test the network and client cost of insertRecords</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">testInsertRecords</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> deviceIds<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Long</span><span class="token punctuation">></span></span> times<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span><span class="token punctuation">></span></span> measurementsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span><span class="token punctuation">></span></span> valuesList<span class="token punctuation">)</span> |
| |
| <span class="token keyword">void</span> <span class="token function">testInsertRecords</span><span class="token punctuation">(</span><span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span></span> deviceIds<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Long</span><span class="token punctuation">></span></span> times<span class="token punctuation">,</span> |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">></span><span class="token punctuation">></span></span> measurementsList<span class="token punctuation">,</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">TSDataType</span><span class="token punctuation">></span><span class="token punctuation">></span></span> typesList |
| <span class="token class-name">List</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">List</span><span class="token punctuation"><</span><span class="token class-name">Object</span><span class="token punctuation">></span><span class="token punctuation">></span></span> valuesList<span class="token punctuation">)</span> |
| </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><ul><li>Test the network and client cost of insertTablet</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">testInsertTablet</span><span class="token punctuation">(</span><span class="token class-name">Tablet</span> tablet<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>Test the network and client cost of insertTablets</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">void</span> <span class="token function">testInsertTablets</span><span class="token punctuation">(</span><span class="token class-name">Map</span><span class="token generics"><span class="token punctuation"><</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Tablet</span><span class="token punctuation">></span></span> tablets<span class="token punctuation">)</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><h3 id="coding-examples"><a href="#coding-examples" class="header-anchor">#</a> Coding Examples</h3> <p>To get more information of the following interfaces, please view session/src/main/java/org/apache/iotdb/session/Session.java</p> <p>The sample code of using these interfaces is in example/session/src/main/java/org/apache/iotdb/SessionExample.java，which provides an example of how to open an IoTDB session, execute a batch insertion.</p> <p>For examples of aligned timeseries and measurement template, you can refer to <code>example/session/src/main/java/org/apache/iotdb/AlignedTimeseriesSessionExample.java</code></p> <h2 id="session-pool-for-native-api"><a href="#session-pool-for-native-api" class="header-anchor">#</a> Session Pool for Native API</h2> <p>We provide a connection pool (`SessionPool) for Native API. |
| Using the interface, you need to define the pool size.</p> <p>If you can not get a session connection in 60 seconds, there is a warning log but the program will hang.</p> <p>If a session has finished an operation, it will be put back to the pool automatically. |
| If a session connection is broken, the session will be removed automatically and the pool will try |
| to create a new session and redo the operation. |
| You can also specify an url list of multiple reachable nodes when creating a SessionPool, just as you would when creating a Session. To ensure high availability of clients in distributed cluster.</p> <p>For query operations:</p> <ol><li>When using SessionPool to query data, the result set is <code>SessionDataSetWrapper</code>;</li> <li>Given a <code>SessionDataSetWrapper</code>, if you have not scanned all the data in it and stop to use it, |
| you have to call <code>SessionPool.closeResultSet(wrapper)</code> manually;</li> <li>When you call <code>hasNext()</code> and <code>next()</code> of a <code>SessionDataSetWrapper</code> and there is an exception, then |
| you have to call <code>SessionPool.closeResultSet(wrapper)</code> manually;</li> <li>You can call <code>getColumnNames()</code> of <code>SessionDataSetWrapper</code> to get the column names of query result;</li></ol> <p>Examples: <code>session/src/test/java/org/apache/iotdb/session/pool/SessionPoolTest.java</code></p> <p>Or <code>example/session/src/main/java/org/apache/iotdb/SessionPoolExample.java</code></p> <h2 id="cluster-information-related-apis-only-works-in-the-cluster-mode"><a href="#cluster-information-related-apis-only-works-in-the-cluster-mode" class="header-anchor">#</a> Cluster information related APIs (only works in the cluster mode)</h2> <p>Cluster information related APIs allow users get the cluster info like where a storage group will be |
| partitioned to, the status of each node in the cluster.</p> <p>To use the APIs, add dependency in your pom file:</p> <div class="language-xml line-numbers-mode"><pre class="language-xml"><code><span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dependencies</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>dependency</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>groupId</span><span class="token punctuation">></span></span>org.apache.iotdb<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>groupId</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>artifactId</span><span class="token punctuation">></span></span>iotdb-thrift-cluster<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>artifactId</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"><</span>version</span><span class="token punctuation">></span></span>0.13.0-SNAPSHOT<span class="token tag"><span class="token tag"><span class="token punctuation"></</span>version</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependency</span><span class="token punctuation">></span></span> |
| <span class="token tag"><span class="token tag"><span class="token punctuation"></</span>dependencies</span><span class="token punctuation">></span></span> |
| </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></div></div><p>How to open a connection:</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">import</span> <span class="token import"><span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>thrift<span class="token punctuation">.</span>protocol<span class="token punctuation">.</span></span><span class="token class-name">TBinaryProtocol</span></span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token import"><span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>thrift<span class="token punctuation">.</span>transport<span class="token punctuation">.</span></span><span class="token class-name">TSocket</span></span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token import"><span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>thrift<span class="token punctuation">.</span>transport<span class="token punctuation">.</span></span><span class="token class-name">TTransport</span></span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token import"><span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>thrift<span class="token punctuation">.</span>transport<span class="token punctuation">.</span></span><span class="token class-name">TTransportException</span></span><span class="token punctuation">;</span> |
| <span class="token keyword">import</span> <span class="token import"><span class="token namespace">org<span class="token punctuation">.</span>apache<span class="token punctuation">.</span>iotdb<span class="token punctuation">.</span>rpc<span class="token punctuation">.</span></span><span class="token class-name">RpcTransportFactory</span></span><span class="token punctuation">;</span> |
| |
| <span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">CluserInfoClient</span> <span class="token punctuation">{</span> |
| <span class="token class-name">TTransport</span> transport<span class="token punctuation">;</span> |
| <span class="token class-name">ClusterInfoService<span class="token punctuation">.</span>Client</span> client<span class="token punctuation">;</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">connect</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| transport <span class="token operator">=</span> |
| <span class="token class-name">RpcTransportFactory</span><span class="token punctuation">.</span>INSTANCE<span class="token punctuation">.</span><span class="token function">getTransport</span><span class="token punctuation">(</span> |
| <span class="token keyword">new</span> <span class="token class-name">TSocket</span><span class="token punctuation">(</span> |
| <span class="token comment">// the RPC address</span> |
| <span class="token class-name">IoTDBDescriptor</span><span class="token punctuation">.</span><span class="token function">getInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getRpcAddress</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> |
| <span class="token comment">// the RPC port</span> |
| <span class="token class-name">ClusterDescriptor</span><span class="token punctuation">.</span><span class="token function">getInstance</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getConfig</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">getClusterRpcPort</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token keyword">try</span> <span class="token punctuation">{</span> |
| transport<span class="token punctuation">.</span><span class="token keyword">open</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">TTransportException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| <span class="token class-name">Assert</span><span class="token punctuation">.</span><span class="token function">fail</span><span class="token punctuation">(</span>e<span class="token punctuation">.</span><span class="token function">getMessage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token comment">//get the client</span> |
| client <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ClusterInfoService<span class="token punctuation">.</span>Client</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">TBinaryProtocol</span><span class="token punctuation">(</span>transport<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> |
| transport<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| <span class="token punctuation">}</span> |
| <span class="token punctuation">}</span> |
| </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><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br></div></div><p>APIs in <code>ClusterInfoService.Client</code>:</p> <ul><li>Get the physical hash ring of the cluster:</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code>list<span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Node</span><span class="token punctuation">></span></span> <span class="token function">getRing</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><ul><li>Get data partition information of input path and time range:</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">/** |
| * @param path input path (should contains a Storage group name as its prefix) |
| * @return the data partition info. If the time range only covers one data partition, the the size |
| * of the list is one. |
| */</span> |
| list<span class="token generics"><span class="token punctuation"><</span><span class="token class-name">DataPartitionEntry</span><span class="token punctuation">></span></span> <span class="token function">getDataPartition</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token operator">:</span>string path<span class="token punctuation">,</span> <span class="token number">2</span><span class="token operator">:</span><span class="token keyword">long</span> startTime<span class="token punctuation">,</span> <span class="token number">3</span><span class="token operator">:</span><span class="token keyword">long</span> endTime<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </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><ul><li>Get metadata partition information of input path:</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">/** |
| * @param path input path (should contains a Storage group name as its prefix) |
| * @return metadata partition information |
| */</span> |
| list<span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Node</span><span class="token punctuation">></span></span> <span class="token function">getMetaPartition</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token operator">:</span>string path<span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </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><ul><li>Get the status (alive or not) of all nodes:</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">/** |
| * @return key: node, value: live or not |
| */</span> |
| map<span class="token generics"><span class="token punctuation"><</span><span class="token class-name">Node</span><span class="token punctuation">,</span> bool<span class="token punctuation">></span></span> <span class="token function">getAllNodeStatus</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </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><ul><li>get the raft group info (voteFor, term, etc..) of the connected node |
| (Notice that this API is rarely used by users):</li></ul> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">/** |
| * @return A multi-line string with each line representing the total time consumption, invocation |
| * number, and average time consumption. |
| */</span> |
| string <span class="token function">getInstrumentingInfo</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> |
| </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></div> <div class="page-nav"><p class="inner"><span class="prev"> |
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