assets/Time-Partition.html-6f5eac6e.js

import{_ as a,C as n,O as r,P as l,ah as s,Q as e,U as t,ai as o,ae as d,aW as h}from"./framework-e4340ccd.js";const c={},m=h('<h2 id="时间分区" tabindex="-1"><a class="header-anchor" href="#时间分区" aria-hidden="true">#</a> 时间分区</h2><h3 id="主要功能" tabindex="-1"><a class="header-anchor" href="#主要功能" aria-hidden="true">#</a> 主要功能</h3><p>时间分区按照时间分割数据，一个时间分区用于保存某个时间范围内的所有数据。时间分区编号使用自然数表示，0 表示 1970 年 1 月 1 日，每隔 partition_interval 毫秒后加一。数据通过计算 timestamp / partition_interval 得到自己所在的时间分区编号，主要配置项如下所示：</p><ul><li>time_partition_interval</li></ul><table><thead><tr><th style="text-align:center;">名字</th><th style="text-align:left;">time_partition_interval</th></tr></thead><tbody><tr><td style="text-align:center;">描述</td><td style="text-align:left;">Database 分区的时间段长度，用户指定的 database 下会使用该时间段进行分区，单位：毫秒</td></tr><tr><td style="text-align:center;">类型</td><td style="text-align:left;">Int64</td></tr><tr><td style="text-align:center;">默认值</td><td style="text-align:left;">604800000</td></tr><tr><td style="text-align:center;">改后生效方式</td><td style="text-align:left;">仅允许在第一次启动服务前修改</td></tr></tbody></table><h3 id="配置示例" tabindex="-1"><a class="header-anchor" href="#配置示例" aria-hidden="true">#</a> 配置示例</h3><p>开启时间分区功能，并设置 partition_interval 为 86400000（一天），则数据的分布情况如下图所示：</p><img style="width:100%;max-width:800px;max-height:600px;margin-left:auto;margin-right:auto;display:block;" src="https://alioss.timecho.com/docs/img/UserGuide/Data-Concept/Time-Partition/time_partition_example.png" alt="time partition example"><ul><li><p>插入一条时间戳为 0 的数据，计算 0 / 86400000 = 0，则该数据会被存储到 0 号文件夹下的TsFile中</p></li><li><p>插入一条时间戳为 1609459200010 的数据，计算 1609459200010 / 86400000 = 18628，则该数据会被存储到 18628 号文件夹下的TsFile中</p></li></ul><h3 id="使用建议" tabindex="-1"><a class="header-anchor" href="#使用建议" aria-hidden="true">#</a> 使用建议</h3>',10),p=e("ul",null,[e("li",null,[e("p",null,"enable_timed_flush_unseq_memtable: 是否开启乱序 Memtable 的定时刷盘，默认打开。")]),e("li",null,[e("p",null,"enable_timed_flush_seq_memtable: 是否开启顺序 Memtable 的定时刷盘，默认关闭。应当在开启时间分区后打开，定时刷盘非活跃时间分区下的 Memtable，为定时关闭 TsFileProcessor 作准备。")])],-1);function u(_,f){const i=n("RouterLink");return r(),l("div",null,[s(`

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`),m,e("p",null,[t("使用时间分区功能时，建议同时打开 Memtable 的定时刷盘功能，共 6 个相关配置参数（详情见 "),o(i,{to:"/zh/UserGuide/Master/Reference/DataNode-Config-Manual.html"},{default:d(()=>[t("timed_flush配置项")]),_:1}),t("）。")]),p])}const x=a(c,[["render",u],["__file","Time-Partition.html.vue"]]);export{x as default};