import{_ as i,r as n,o as u,c,a as l,d as o,e,b as t,w as d,f as a}from"./app-dNeAgOFp.js";const h={},g=a('<h1 id="background" tabindex="-1"><a class="header-anchor" href="#background" aria-hidden="true">#</a> Background</h1><p>The storage group is specified by the user display.<br> Use the statement &quot;SET STORAGE GROUP TO&quot; to specify the storage group.<br> 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.<br> So the server side parallelism of data ingestion is equal to the number of storage group.</p><h1 id="problem" tabindex="-1"><a class="header-anchor" href="#problem" aria-hidden="true">#</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.<br> The number of storage groups may be small which makes the parallelism of data ingestion of IoTDB insufficient. We can&#39;t jump out of this dilemma even we start hundreds of client for ingestion.</p><h1 id="solution" tabindex="-1"><a class="header-anchor" href="#solution" aria-hidden="true">#</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>',8),p=o("br",null,null,-1),m={href:"http://root.sg",target:"_blank",rel:"noopener noreferrer"},f={href:"http://root.sg",target:"_blank",rel:"noopener noreferrer"},b=a(`<h1 id="usage" tabindex="-1"><a class="header-anchor" href="#usage" aria-hidden="true">#</a> Usage</h1><p>To use virtual storage group, you can set this config below:</p><div class="language-text line-numbers-mode" data-ext="text"><pre class="language-text"><code>virtual_storage_group_num
</code></pre><div class="line-numbers" aria-hidden="true"><div class="line-number"></div></div></div><p>Recommended value is [virtual storage group number] = [CPU core number] / [user-defined storage group number]</p>`,4);function _(v,x){const r=n("ExternalLinkIcon"),s=n("RouterLink");return u(),c("div",null,[l(`

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`),g,o("p",null,[e("In detail, we use hash to group different devices into buckets called virtual storage group."),p,e(` For example, one device called "root.sg.d"(assume it's storage group is "`),o("a",m,[e("root.sg"),t(r)]),e('") is belonged to virtual storage group "'),o("a",f,[e("root.sg"),t(r)]),e('.[hash("root.sg.d") mod num_of_virtual_storage_group]"')]),b,o("p",null,[e("For more information, you can refer to "),t(s,{to:"/UserGuide/V0.13.x/Reference/Config-Manual.html"},{default:d(()=>[e("this page")]),_:1}),e(".")])])}const w=i(h,[["render",_],["__file","VirtualStorageGroup.html.vue"]]);export{w as default};