Opentracing
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一个tracer过程中,各span的关系
[Span A] ←←←(the root span)
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+------+------+
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[Span B] [Span C] ←←←(Span C 是 Span A 的孩子节点, ChildOf)
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[Span D] +---+-------+
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[Span E] [Span F] >>> [Span G] >>> [Span H]
↑
↑
↑
(Span G 在 Span F 后被调用, FollowsFrom)上述tracer与span的时间轴关系
––|–––––––|–––––––|–––––––|–––––––|–––––––|–––––––|–––––––|–> time
[Span A···················································]
[Span B··············································]
[Span D··········································]
[Span C········································]
[Span E·······] [Span F··] [Span G··] [Span H··]