investigate dependency graph issues

[codefromthecrypt]

I've heard from @joshlong and @marcingrzejszczak that sleuth'd traces aren't showing up in zipkin's UI dependency graph view.

The dependency graph view is special cased for zipkin "server" annotations. That's due to a number of reasons, including keeping the rules simple, the input data small and avoiding double-counting.

The following patterns will trigger nodes in the dependency tree.

• server span
  • A span has a SERVER_RECV("sr") annotation, but no CLIENT_ADDR("ca")
• uninstrumented client+server span
  • A span has a CLIENT_ADDR("ca") binary annotation and a SERVER_RECV("sr") annotation
  • A span has both CLIENT_ADDR("ca") and SERVER_ADDR("sa") binary annotations
• client-only span
  • A span has a SERVER_ADDR("sa") binary annotation, but no SERVER_RECV("sr")

If sleuthed spans don't produce combinations like above, stop here, and try and figure out why or what's missing.

If sleuthed spans look right per above, yet no dependency graph is showing up in either mem or mysql storage...

catch a trace via http://zipkinhost:9411/api/v1/trace/your_trace_id and ask about it in https://gitter.im/openzipkin/zipkin, preferably a pared down trace (vs one with a 100+ spans).

If you want details, there are a number of tests that account for behaviors, addressing specific instrumentation use cases.
https://github.com/openzipkin/zipkin-java/blob/master/zipkin/src/test/java/zipkin/internal/DependencyLinkSpanTest.java
https://github.com/openzipkin/zipkin-java/blob/master/zipkin/src/test/java/zipkin/internal/DependencyLinkerTest.java
https://github.com/openzipkin/zipkin-java/blob/master/zipkin/src/test/java/zipkin/DependenciesTest.java

[codefromthecrypt]

ps added this to try and find a good place to document this in a way that doesn't require familiarity with java openzipkin/openzipkin.github.io#13

[marcingrzejszczak]

There are still issues in messaging and Zuul

[marcingrzejszczak]

Related to: https://github.com/openzipkin/zipkin-java/pull/144

[marcingrzejszczak]

Messaging fixed in caba82c

Zuul fixed in b3c78c1