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Tracing

Lotus uses OpenCensus for tracing application flow. This generates spans through the execution of annotated code paths.

Currently it is set up to use jaeger, though other tracing backends should be fairly easy to swap in.

Running Locally

To easily run and view tracing locally, first, install jaeger. The easiest way to do this is to download the binaries from https://www.jaegertracing.io/download/ and then run the jaeger-all-in-one binary. This will start up jaeger, listen for spans on localhost:6831, and expose a web UI for viewing traces on http://localhost:16686/.

Now, to start sending traces from lotus to jaeger, set the environment variable LOTUS_JAEGER to localhost:6831, and start the lotus daemon.

Now, to view any generated traces, open up http://localhost:16686/ in your browser.

Adding Spans

To annotate a new codepath with spans, add the following lines to the top of the function you wish to trace:

ctx, span := trace.StartSpan(ctx, "put function name here")
defer span.End()