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O'Reilly Platform
book
云原生:运用容器、函数计算和数据构建下一代应用
by
Boris Scholl
,
Trent Swanson
,
Peter Jausovec
May 2020
Beginner to intermediate
215 pages
3h 58m
Chinese
China Machine Press
Content preview from
云原生:运用容器、函数计算和数据构建下一代应用
最佳实践
|
173
计算的一些解决方案,如
Azure Durable Functions
或者
AWS Step Functions
。
6.6.3
函数应保持轻量和简单
一个函数只应该做一件事,并且应该依赖很少的外部库。函数中任何额外的或者多余的
代码都会使函数的体积变大,影响启动时间。
6.6.4
实现无状态函数
不要在函数中保存任何数据,因为函数实例通常运行在其自身的隔离环境中,函数之间
不要共享任何东西,哪怕是同一个函数的不同调用也不要共享数据。
6.6.5
分离函数入口和函数的业务逻辑
函数都有其入口,可以被函数计算框架调用。框架特定的上下文通常与调用上下文一起
传递到函数入口。例如,如果通过
API
网关发送一个
HTTP
请求来调用函数,那么上下
文中将包含
HTTP
相关的详细信息。入口方法应将这些上下文的详细信息与其余代码分
开。这将改善函数的可管理性
、
可测试性和可移植性。
6.6.6
避免长时间运行的函数
大多数函数即服务(
FaaS
)产品都会对每个函数的可执行时间设置一个上限。因此,长
时间运行的函数可能会导致加载时间变长
、
超时等问题。尽可能重构大的函数,把其拆
分为几个可以一起工作的小函数。
6.6.7
用队列解决跨函数通信问题
函数间的通信应该靠消息队列来发送消息,而不是直接通过函数相互调用来传递信息。
函数应当通过队列中的事件(消息插入
、
删除
、
更新,等等)来触发和执行。
6.7
运维
运维实践是组织能否利用好云技术的基石。在第
5
章中我们已经讨论了云原生应用利用
DevOps
的基本原则和一些最佳实践。 ...
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Publisher Resources
ISBN: 9787111653240