Trace time message spent in Kafka

[arkadyb]

Trace time message spent in Kafka

[yurishkuro]

Why do you need an extra span? The gap between producer and consumer spans is already measurable.

[yurishkuro]

Here's a trace from https://github.com/PacktPublishing/Mastering-Distributed-Tracing/tree/master/Chapter05. You can see time difference between send and receive spans.

[arkadyb]

Thats true, but it would be nice to be able plot a span specifying what the gap is - Kafka, PG, MySQL or what ever else.

[yurishkuro]

I cannot speak for other tracing systems, but in Jaeger we made a design decision that a span "belongs" to a single process, which is reflected in the data model, e.g. in properties like span.process.serviceName. This ensures that the start/end timestamps in the span are comparable, which is not true if they come from different processes / different hosts (clock skew).

I am going to move this issue to another repo, since it's not specific to Go API.

[guilherme-souza-lima]

hi @arkadyb

how did you inject the context into the kafka header?

and how did you extract it in the second microservice?