Chapter7 服务粒度1—粒度

分布式系统的大部分问题，大部分与粒度有关，而不是模块化
粒度的大小与类的数量和代码的行数无关，而是由服务所做的事定义的
可以通过两个指标：
1. 服务内的代码命令数
2. 服务暴露的功能数量
most issues and challenges within distributed systems are typically not related to modular‐ity, but rather granularity
Granularity is not defined by the number of classes or lines of code in service, but rather what the service does—hence why it is so hard to get service granularity right.
determine the appropriate level of service granularity
two metrics:

to calculate the number of statements is to objectively measure what the service is doing

measure and track the number of public interfaces or operations exposed by a service