July 2023
Beginner to intermediate
270 pages
4h 48m
Chinese
Content preview from 可观测性工程
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从这些请求头中提取信息，并添加到生成的
traceData
中的
trace_id
和
parent_id
内。
这些服务中的每一个都会将其生成的
span
发送到链路追踪后端。在后端，这些链路被拼
接在一起，用于创建瀑布式的可视化功能图以供查看。
生成的第一个 span 没有
trace ID 或者 span ID
，
所以必须创建
，
例如
：
TraceId
：
7627824
SpanId
：
f4c480e
图 6-3：示例 App 将接收
traceID
和
parentID
到每个子 span 中
当前已经了解探针收集的数据，创造了一个很有用的链路追踪视图。现在看一下还能向
span
中增加哪些内容以更有利于调试。
6.4 将自定义字段添加到链路 span
理解父子关系和执行时长是一个良好的开始，但因为在分布式系统中每个
span
的运行埋
点很深，所以通常除了必不可少的链路追踪数据外，最好添加其他字段以更好地理解每
个
span
。
例如，除了存储服务名以便于标识外，知道执行工作的精确主机及其是否涉及特定用户
可能会很有用。让我们修改例子，通过将这些细节作为键值对添加到链路追踪中来捕获
它们：
hostname, _ := os.Hostname()
traceData["tags"] = make(map[string]interface{})
traceData["tags"]["hostname"] = hostname
traceData["tags"]["user_name"] = name
也可以对例子进行扩展，以便捕获任何其他与调试有关的系统信息 ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.