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The specification requires that SpanContext is immutable. Resampling a span in process is potentially dangerous since other spans may have been created from it assuming the original sampling decision which can result in broken traces or otherwise lost data. It is generally only safe to either perform head sampling in the SDK or tail sampling, with all spans in a trace available for resampling, in the collector or other span aggregator. |
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But if the downstream link hits the sampling, but the current rpc service is not hit, how to make the current service also be able to sample? |
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How to sampling in tail? |
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To enable tail sampling you would need to always sample spans in the SDK and export them to a collector or other system configured to aggregate samples for a trace and perform tail sampling. Tail sampling cannot be performed in-process with span creation. |
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The specification requires that SpanContext is immutable. Resampling a span in process is potentially dangerous since other spans may have been created from it assuming the original sampling decision which can result in broken traces or otherwise lost data. It is generally only safe to either perform head sampling in the SDK or tail sampling, with all spans in a trace available for resampling, in the collector or other span aggregator.