October 2020
Intermediate to advanced
261 pages
5h 32m
Chinese
Content preview from Graphite监控
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28
｜
第
3
章
Graphite
组件
基于
Twisted
库（一个事件驱动的网络引擎）。但是，仅把它理解成一个缓存，将是一个
严重的误解。
carbon-cache
是一种网络服务，它接收从客户端流入的指标，将指标临时
存储在内存（缓存）中，然后将它们写入
Whisper
数据库文件中。它支持
TCP
或
UDP
传输协议，可以接收纯文本格式的指标，或者是经
Python pickle
协议序列化过的指标。
如果你采用大规模分布式系统，
Graphite
甚至可以支持
AMQP
消息总线。由于
Graphite
需要访问持久化指标和内存中的指标，因此缓存守护进程还有一个查询端口，
Graphite
Web
应用程序利用该端口轮询尚未写入磁盘的“热”指标。
固态磁盘驱动器
由于
carbon-cache
的大部分工作和
I/O
相关，因此它对磁盘读写速度和内存大
小很敏感。慢速磁盘或内存过小都会导致
carbon-cache
的性能和稳定性加速
恶化。因此，我通常建议所有的
Carbon
节点使用固态（
SSD
）硬盘，当然，你
可以在条带化
RAID
配置中使用传统硬盘，但从长远来看，
SSD
更快、更可靠。
使用基本安装时通常只会有一个
carbon-cache
进程。每个缓存绑定一个
CPU
内核，因
此很容易用简单的
UNIX
命令（如
top
或
ps
）跟踪到超负荷的缓存进程。根据历史经验，
你的基本款的
Graphite Server
会很受欢迎，并且很快会到达单个进程的
I/O
上限。幸运
的是，
carbon-cache
被设计成允许多个实例并行运行。而且，由于每个进程都运行在独 ...
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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.