zipkin源码 1.简介

简介

zipkin是分布式跟踪系统，在微服务架构中，它能够获取实时的数据帮助解决请求延迟问题。zipkin收集并展现调用链数据。zipkin是基于谷歌的Dapper系统设计的。

zipkin架构

首先在app使用zipkin的客户端，收集server，client（后面会讲）的调用关系数据，经过reporter上传到Collector，而后Collector经过Storage进行存储，最后UI展现调用链信息。

zipkin的基本概念

span

基本工做单元，一次链路调用建立一个span，能够是httpclient，db调用。span经过parentSpanId进行关联

trace

表明一个完整的请求，期间可能横跨多个服务，用惟一标识。tace是多个span的集合。

Annotation

Annotation是span的tag集合。它主要有5种类型：

cs - Client Start,表示客户端发起请求

sr - Server Receive,表示服务端收到请求

ss - Server Send,表示服务端完成处理，并将结果发送给客户端

cr - Client Received,表示客户端获取到服务端返回信息

lc - local component，表示本地span，不能跨进程，好比一次file io操做

BinaryAnnotation

能够在此tag种添加业务信息

完整的报文

[
  {
    "traceId": "a0e07d61b5f6060a",
    "id": "a0e07d61b5f6060a",
    "name": "get",
    "timestamp": 1479457971341000,
    "duration": 3872769,
    "annotations": [
      {
        "timestamp": 1479457971341000,
        "value": "sr",
        "endpoint": {
          "serviceName": "service1",
          "ipv4": "172.16.8.79"
        }
      },
      {
        "timestamp": 1479457975213769,
        "value": "ss",
        "endpoint": {
          "serviceName": "service1",
          "ipv4": "172.16.8.79"
        }
      }
    ],
    "binaryAnnotations": [
      {
        "key": "exception",
        "value": "asdas",
        "endpoint": {
          "serviceName": "service1",
          "ipv4": "172.16.8.79"
        }
      },
      {
        "key": "http.status_code",
        "value": "200",
        "endpoint": {
          "serviceName": "service1",
          "ipv4": "172.16.8.79"
        }
      },
      {
        "key": "http.url",
        "value": "/start",
        "endpoint": {
          "serviceName": "service1",
          "ipv4": "172.16.8.79"
        }
      }
    ]
  },
  {
    "traceId": "a0e07d61b5f6060a",
    "id": "3be8fed4e9846694",
    "name": "get",
    "parentId": "a0e07d61b5f6060a",
    "timestamp": 1479457971444000,
    "duration": 41291,
    "annotations": [
      {
        "timestamp": 1479457971444000,
        "value": "cs",
        "endpoint": {
          "serviceName": "service1",
          "ipv4": "172.16.8.79"
        }
      },
      {
        "timestamp": 1479457971485291,
        "value": "cr",
        "endpoint": {
          "serviceName": "service1",
          "ipv4": "172.16.8.79"
        }
      }
    ],
    "binaryAnnotations": [
      {
        "key": "http.url",
        "value": "http://www.baidu.com/",
        "endpoint": {
          "serviceName": "service1",
          "ipv4": "172.16.8.79"
        }
      }
    ]
  }
]