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数据库
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语言
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QA
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<li class="md-nav__item">
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<a href="../../database/elasticsearch/production_configuring/" class="md-nav__link">
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<span class="md-ellipsis">
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生产配置参考
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../database/elasticsearch/doc_values_and_fielddata/" class="md-nav__link">
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<span class="md-ellipsis">
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docs value与 field data
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</span>
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</a>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item">
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<a href="../../database/redis/redis/" class="md-nav__link">
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<span class="md-ellipsis">
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Redis
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</span>
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</a>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item">
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<a href="../../cache/" class="md-nav__link">
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<span class="md-ellipsis">
|
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缓存系统
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</span>
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</a>
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</li>
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<li class="md-nav__item md-nav__item--section md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_6" >
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<label class="md-nav__link" for="__nav_6" id="__nav_6_label" tabindex="">
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<span class="md-ellipsis">
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容器
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</span>
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<span class="md-nav__icon md-icon"></span>
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</label>
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_6_label" aria-expanded="false">
|
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<label class="md-nav__title" for="__nav_6">
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<span class="md-nav__icon md-icon"></span>
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容器
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../../container/install/" class="md-nav__link">
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<span class="md-ellipsis">
|
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|
简介
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../container/image/" class="md-nav__link">
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<span class="md-ellipsis">
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镜像
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../container/cgroup/" class="md-nav__link">
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<span class="md-ellipsis">
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cgroup
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</span>
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</a>
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</li>
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<li class="md-nav__item">
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<a href="../../container/namespace/" class="md-nav__link">
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<span class="md-ellipsis">
|
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namespace
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</span>
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</a>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item md-nav__item--section md-nav__item--nested">
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_7" >
|
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<label class="md-nav__link" for="__nav_7" id="__nav_7_label" tabindex="">
|
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<span class="md-ellipsis">
|
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|
语言
|
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</span>
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<span class="md-nav__icon md-icon"></span>
|
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</label>
|
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<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_7_label" aria-expanded="false">
|
|
|
<label class="md-nav__title" for="__nav_7">
|
|
|
<span class="md-nav__icon md-icon"></span>
|
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|
语言
|
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</label>
|
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<ul class="md-nav__list" data-md-scrollfix>
|
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<li class="md-nav__item">
|
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<a href="../../language/Go/" class="md-nav__link">
|
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<span class="md-ellipsis">
|
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|
Go
|
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</span>
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</a>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item md-nav__item--section md-nav__item--nested">
|
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<input class="md-nav__toggle md-toggle " type="checkbox" id="__nav_8" >
|
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|
|
<label class="md-nav__link" for="__nav_8" id="__nav_8_label" tabindex="">
|
|
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|
|
<span class="md-ellipsis">
|
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|
QA
|
|
|
</span>
|
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|
|
<span class="md-nav__icon md-icon"></span>
|
|
|
</label>
|
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|
<nav class="md-nav" data-md-level="1" aria-labelledby="__nav_8_label" aria-expanded="false">
|
|
|
<label class="md-nav__title" for="__nav_8">
|
|
|
<span class="md-nav__icon md-icon"></span>
|
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|
QA
|
|
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</label>
|
|
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<ul class="md-nav__list" data-md-scrollfix>
|
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<li class="md-nav__item">
|
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<a href="../redis/" class="md-nav__link">
|
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|
|
<span class="md-ellipsis">
|
|
|
redis
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</span>
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../mysql/" class="md-nav__link">
|
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|
<span class="md-ellipsis">
|
|
|
mysql
|
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</span>
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../tcp/" class="md-nav__link">
|
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|
<span class="md-ellipsis">
|
|
|
tcp
|
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</span>
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../http/" class="md-nav__link">
|
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|
<span class="md-ellipsis">
|
|
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http
|
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</span>
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../cache/" class="md-nav__link">
|
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|
|
<span class="md-ellipsis">
|
|
|
缓存
|
|
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</span>
|
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../nginx/" class="md-nav__link">
|
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|
|
|
<span class="md-ellipsis">
|
|
|
nginx
|
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</span>
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</a>
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</li>
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<li class="md-nav__item">
|
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|
<a href="../queue/" class="md-nav__link">
|
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|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
消息队列
|
|
|
</span>
|
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../io/" class="md-nav__link">
|
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|
|
<span class="md-ellipsis">
|
|
|
IO
|
|
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</span>
|
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</a>
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</li>
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<li class="md-nav__item">
|
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|
<a href="../protobuf/" class="md-nav__link">
|
|
|
|
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|
|
|
|
<span class="md-ellipsis">
|
|
|
protobuf
|
|
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</span>
|
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</a>
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</li>
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<li class="md-nav__item">
|
|
|
<a href="../go/" class="md-nav__link">
|
|
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|
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|
|
|
|
<span class="md-ellipsis">
|
|
|
go
|
|
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</span>
|
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../dist/" class="md-nav__link">
|
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|
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|
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|
|
<span class="md-ellipsis">
|
|
|
分布式
|
|
|
</span>
|
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</a>
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</li>
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<li class="md-nav__item">
|
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|
<a href="../es/" class="md-nav__link">
|
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
Elasticsearch
|
|
|
</span>
|
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</a>
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</li>
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<li class="md-nav__item">
|
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|
<a href="../docker/" class="md-nav__link">
|
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
docker
|
|
|
</span>
|
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="../ref/" class="md-nav__link">
|
|
|
|
|
|
|
|
|
<span class="md-ellipsis">
|
|
|
参考资料
|
|
|
</span>
|
|
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</a>
|
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|
</li>
|
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</ul>
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|
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</nav>
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|
</li>
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|
</ul>
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</nav>
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</div>
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</div>
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</div>
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<div class="md-sidebar md-sidebar--secondary" data-md-component="sidebar" data-md-type="toc" >
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<nav class="md-nav md-nav--secondary" aria-label="目录">
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目录
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="#_1" class="md-nav__link">
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架构
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</a>
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<li class="md-nav__item">
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<a href="#_2" class="md-nav__link">
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可比较性
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</a>
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<li class="md-nav__item">
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<a href="#elasticsearch" class="md-nav__link">
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Elasticsearch容量规划
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<nav class="md-nav" aria-label="Elasticsearch容量规划">
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<a href="#_3" class="md-nav__link">
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<h2 id="_1">架构<a class="headerlink" href="#_1" title="Permanent link">¶</a></h2>
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<p>Service是业务层，Dao是数据访问层，这样的分层是基于MVC架构来说的，分层的主要作用是解耦。
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对于Spring这样的框架，（View\Web）表示层调用控制层（Controller），控制层调用业务层（Service），业务层调用数据访问层（Dao）。
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具体起来，Dao的作用是封装对数据库的访问：增删改查，不涉及业务逻辑，只是达到按某个条件获得指定数据的要求；
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而Service，则是专注业务逻辑，对于其中需要的数据库操作，都通过Dao去实现；</p>
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<p>：DAO = Data Access Object</p>
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<p>表示层 （也称为UI层）
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应用层 （也称为服务层）
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业务逻辑层 （也称为域层）
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数据访问层 （也称为持久化层）</p>
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<ul>
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<li><a href="https://www.infoq.cn/article/6rx047oohjlrdipd1bc2">程序员必知的几种软件架构模式</a></li>
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</ul>
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<h1 id="go">Go<a class="headerlink" href="#go" title="Permanent link">¶</a></h1>
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<h2 id="_2">可比较性<a class="headerlink" href="#_2" title="Permanent link">¶</a></h2>
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<p>可比较才可以用作map的键。</p>
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<p>可比较：</p>
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<p>基础类型
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指针</p>
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<p>不可比较：
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slice
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map
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函数</p>
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<p>有时可比较有时不可比较：
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接口
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结构体 【包含不可比较对象时不可比较】</p>
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<h2 id="elasticsearch">Elasticsearch容量规划<a class="headerlink" href="#elasticsearch" title="Permanent link">¶</a></h2>
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<p>分片大小
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日志类：单个分片不超过 50G</p>
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<p>搜索类：单个分片不超过 20G</p>
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<p>先估算总数据量，再根据分片大小，确定分片数。</p>
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<p>容量规划
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容量规划时要考虑的因素：</p>
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<p>机器的软硬件配置
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单个文档的尺寸，文档总数，索引大小，分片个数，副本个数
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文档写入方式（如 bulk 的单次数据量）
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文档的复杂度
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文档的读取方式（如，要进行怎样的查询和聚合）
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容量规划的步骤：</p>
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<p>先进行性能评估：例如每秒写多少，每秒读多少，读单个文档能接受多大延迟。
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再观察数据：mapping 的样子，需要什么样的查询和聚合。
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两个典型的场景：</p>
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<p>搜索：数据增长较慢。
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日志：增长快，需要冷热分离，需要自动删除。
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硬件配置：</p>
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<p>搜索之类的高性能场景，磁盘要 SSD，磁盘 GB 数/内存 GB 数 = 1/10</p>
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<p>日志和并发不高的场景，磁盘可以机械硬盘，磁盘 GB 数/内存 GB 数 = 1/50</p>
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<p>单节点的数据量最好 2 TB 之内，最大不超过 5 TB。</p>
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<p>JVM 的内存配机器内存的一半，同时 JVM 内存不超过 32 GB。</p>
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<h3 id="_3"><a class="headerlink" href="#_3" title="Permanent link">¶</a></h3>
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<ul>
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<li><a href="https://studygolang.com/articles/11342">结构体的可比较性</a></li>
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</ul>
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