October 2020
Intermediate to advanced
261 pages
5h 32m
Chinese
Content preview from Graphite监控
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44
｜
第
3
章
Graphite
组件
与发送给
Carbon
并写入
Whisper
文件的指标不同，事件可以提交到
Graphite
事件
API
，
也可以通过
Django
管理
UI
手动输入。它们和
Web
应用程序的用户配置、图形和仪表盘
配置一起被保存到同一个关系数据库中。如果你想谨慎而明智地使用事件，我再次强烈
建议你使用
PostgreSQL
或
MySQL
作为
RDBMS
。
后端存储
在
Web
应用程序可以构建图形（或简单地将格式化数据以
JSON
格式返回给客户端）之
前，它必须首先从后端存储服务中提取时序数据。正如我们之前发现的，
Graphite
将指
标存储到
Whisper
数据库文件中，还能够通过
carbon-cache
查询端口查询尚未持久化到
磁盘的“热数据”。
事实上，网络中的每个
Carbon/Whisper
节点都必须有一个相应的运行在本地的
Graphite
Web
实例。该组件充当存储在主机上的任何
Whisper
指标的网络查询接口，响应来自
其他
Graphite Web
实例的
API
调用。从这个意义上来说，
Graphite
集群有点不同寻常 ：
Carbon/Whisper
节点必须有一个
Graphite Web
进程用于读取指标，但你也可以找到专用
的
Graphite Web
“渲染节点”，它只充当前端
Web
服务，并专门为从后端中提取结果，
以及转换和渲染结果给用户进行优化。
事实证明，
Whisper
并不是
Graphite Web
可以从中读取数据的唯一存储格式。
Graphite
从一开始就包括对
Round-Robin
数据库（
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.