wu-sheng commented on issue #978: Purpose of tag method in AbstractSpan URL: https://github.com/apache/incubator-skywalking/issues/978#issuecomment-375510423 Yes, they are always in one thread, guarantee by Javs stack module, not by SkyWalking. But you must be careful of concurrency. For tags, those are from OpenTracing, which tag the info for backend analysis, aggregation and visualization.
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