lesson03

NOTE

This README is currently incomplete / unfinished. Please refer to respective README in tutorials for one of the other languages

Lesson 3 - Tracing RPC Requests

Objectives

Learn how to:

• Trace a transaction across more than one microservice
• Pass the context between processes using Inject and Extract
• Apply OpenTracing-recommended tags

Walkthrough

Hello-World Microservice App

To test it out, first run the formatter and publisher services in separate terminals

# terminal 1
$ node lesson03/solution/formatter.js
 * Running on http://localhost:8081/ (Press CTRL+C to quit)

# terminal 3
$ node lesson03/solution/publisher.js
 * Running on http://localhost:8082/ (Press CTRL+C to quit)

Finally, if we run the client app as we did in the previous lessons:

$ node lesson03/solution/hello.js Peter
INFO  Initializing Jaeger Tracer with CompositeReporter and ConstSampler
Hello app listening on port 8080
INFO  Reporting span 80c31f112061d86e:1def63dfd6d6755d:80c31f112061d86e:1
INFO  Reporting span 80c31f112061d86e:e47ca83f948cb0c4:80c31f112061d86e:1
INFO  Reporting span 80c31f112061d86e:80c31f112061d86e:0:1

On formatter terminal screen:

INFO  Initializing Jaeger Tracer with CompositeReporter and ConstSampler
Formatter app listening on port 8081
INFO  Reporting span 80c31f112061d86e:9ad7c16acf5f0994:1def63dfd6d6755d:1

On publisher terminal screen:

INFO  Initializing Jaeger Tracer with CompositeReporter and ConstSampler
Publisher app listening on port 8082
Hello, Peter!
INFO  Reporting span 80c31f112061d86e:f3211e5bb77c5f2b:e47ca83f948cb0c4:1