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| <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav> <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading open"><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"><span>API</span> <span class="arrow right"></span></p> <!----></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</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="background"><a href="#background" class="header-anchor">#</a> Background</h1> <p>The storage group is specified by the user display. |
| Use the statement "SET STORAGE GROUP TO" to specify the storage group. |
| Each storage group has a corresponding StorageGroupProcessor.</p> <p>To ensure eventually consistency, a insert lock (exclusive lock) is used to synchronize each insert request in each storage group. |
| So the server side parallelism of data ingestion is equal to the number of storage group.</p> <h1 id="problem"><a href="#problem" class="header-anchor">#</a> Problem</h1> <p>From background, we can infer that the parallelism of data ingestion of IoTDB is max(num of client, server side parallelism), which equals to max(num of client, num of storage group)</p> <p>The concept of storage group usually is related to real world entity such as factory, location, country and so on. |
| The number of storage groups may be small which makes the parallelism of data ingestion of IoTDB insufficient. We can't jump out of this dilemma even we start hundreds of client for ingestion.</p> <h1 id="solution"><a href="#solution" class="header-anchor">#</a> Solution</h1> <p>Our idea is to group devices into buckets and change the granularity of synchronization from storage group level to device buckets level.</p> <p>In detail, we use hash to group different devices into buckets called data region. |
| For example, one device called "root.sg.d"(assume it's storage group is "root.sg") is belonged to data region "root.sg.[hash("root.sg.d") mod num_of_data_region]"</p> <h1 id="usage"><a href="#usage" class="header-anchor">#</a> Usage</h1> <p>To use data region, you can set this config below:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>data_region_num |
| </code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Recommended value is [data region number] = [CPU core number] / [user-defined storage group number]</p> <p>For more information, you can refer to <a href="/UserGuide/Master/Reference/Config-Manual.html">this page</a>.</p></div> <!----> <p style="text-align: center; color: #909399; font-size: 12px; margin: 0 30px;">Copyright © 2022 The Apache Software Foundation.<br> |
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