August 2019
Beginner to intermediate
232 pages
3h 50m
Chinese
Content preview from Web容量规划之美
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73
测量
：
容量的单位
能
SELECT
语句的查询效率是决定健康的一个主要因素。在负载均衡中更多的一些
复杂因素还包括罕见的协议、繁杂的平衡算法，以及确保负载均衡能使你的应用
程序更优化地工作的调优。
注意
关于谷歌的软件网络负载平衡器
，
称为磁悬浮
，
请参考本章后面的
“
延
展阅读
”。
网络路由器通过等成本多路径
（
ECMP
）
将数据包均匀地分发
给磁悬浮服务器
，
每个磁悬浮服务器相匹配的数据包对应的服务均匀散
布到服务端点
。
为了适应高流量和日益增长的流量
，
磁悬浮是专门为分
组处理性能优化的
。
一个单一的磁悬浮服务器能够使
10 Gb/s
的小包裹
连接饱和
。
磁悬浮服务器还配备了一致的散列和连接跟踪功能
，
以尽量
减少意外故障和故障对面向连接协议的负面影响
。
应用程序监控
本章余下的部分使用示例来演示一些重要的监控技术，这是你需要知道并执行的。
应用层的测量
如前所述，服务器统计数据只是描绘了容量图的一部分。你还应该特别针对你的
应用程序，测量并记录高级别的度量指标，不是针对一个服务器，而是针对整个
系统。在
Web
服务器上的
CPU
和服务器磁盘使用量，不能完整地说明对于每个
Web
请求都发生了些什么，而且一个
Web
请求流可能会涉及若干硬件设施。示例
应用程序级别的指标包括压力高峰
/
分钟、上传照片数
/
分钟（
Instagram
）、短信
数
/
分钟数（
WhatsApp
）、并发流量次数（
Netflix
）等。此外，应用程序级别的
指标通常根据不同的使用情况收集每秒、每分钟、每天、每周、每月或每年的指标。
在
Flickr
上，我们每天和累计的基础上收集应用程序指标 ...
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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.
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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.