Introduction and Use

TraceID global

SpanID each service

Guide package:

Zipkin imports the JAR package, adds @enableZipkinServer to the startup class, and accesses port 9411 to get to the home page

Call link

Zipkin can be integrated with EL to store data in EL.

The core concept

The basic elements include events, nodes, times, and relationships

The principle of event capture: AOP buried point, bytecode peg capture

Event concatenation: Through tranceID and spanID (id generated when an event occurs)

1) Generate an ID

Generate event ID, Tid:

In the httpservlet. service method -, the classloader is applied and the dispatchservlet. dispatch method is re-invoked when forwardCopy the code

2) Pass id (privacy parameter)

RPC, Dubbo, setAttachment, buried HTTP, request header socket, JMS in the filterCopy the code

Added: HTTP, RPC

In microservices, most of them use external REST and internal RPC. Rest uses HTTP protocol, which needs to be serialized twice and has a large volume. Only strings can be unlimited in transmission across firewalls (multiple lans). RPC uses TCP and IP protocols for high efficiency only once, and is small in size, but does not cross firewalls.

3) How to ensure data consistency under concurrent conditions

Data is stored in ThreadLocal