October 2021
Beginner to intermediate
250 pages
7h 11m
Chinese
Content preview from 微服务与事件驱动架构
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132
｜
第
9
章
9.10
调整函数
每个函数都有基于其工作量的具体需求。优化函数在执行期间使用的资源可以确保在保持
低成本的同时保持高性能。在建立资源和调整函数的参数时，有一些事情需要考虑。
9.10.1
分配足够的资源
每个函数可以被分配一定量的
CPU
和内存资源。重要的是要根据函数需求来调整这些参
数：过度分配会使成本变高，过少分配则可能导致函数崩溃或耗时太久。
最大执行时间是另一个要考虑的因素，因为它限制了函数可能运行的时长。这个参数与批处
理的大小密切相关，因为函数处理事件的时间通常与要处理的事件数呈线性关系。将最大执
行时间设置为高于处理特定批量大小事件的最大预期时间，以避免不必要的函数超时错误。
最后，还必须考虑
FaaS
解决方案的界限上下文中对状态存储的所有外部
I/O
。函数的工作负
载随输入事件流的变化而变化，有些工作负载需要对外部状态进行持续的
I/O
操作
，而其他
工作负载只需要零星的
I/O
。未能提供足够的
I/O
资源会导致吞吐量和性能降低。
9.10.2
批量事件处理的参数
如果函数无法在其执行时间期限内处理分配给它的批量事件，那么函数的执行就被认为是
失败的并且必须重新进行批处理。但是，除非调整分配给函数的执行时间或输入事件的批
量大小，否则处理很可能再次失败。因此，必须至少调整以下两项配置中的其中一项：
•
增加函数的最大执行时间；
•
减小函数要处理的事件的最大批处理大小。
自己建立到事件代理的连接并管理事件消费的函数，可以做到在执行期间定
期提交偏移量，以确保批处理的部分完结。当只是将一批待消费的事件传递 ...
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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.