cannot decode v0.3 traces payload: read limit reached about datadog-trace-agent HOT 5 CLOSED

This happens when the payload sent by the tracer is larger than the maximum size allowed by the agent (currently 10M). Normally tracers should not do this, so I'd guess this is most likely a tracer problem. Which language are you using?

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Elixir

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right, this library:
https://github.com/spandex-project/spandex
Its quite good anyway.
Ok, I will check the payload sent.
It started happen when there is ~1.5k spans within one trace

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Thanks. I will close the issue in that case, since there is nothing to do here. But feel free to post here if you have more questions about how to do this.

What we do in some of our tracers is that we start flushing once the payload size goes above 5MB. If you don't have the size handy you can simply use a different size heuristic. For example, OpenCensus does this to get an estimate of a size. You could do something similar if getting an approximation of the msgpack load is not possible with whatever library exists in Elixir.

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