async span can't clear traceContext

[liyanyan-dev]

Please answer these questions before submitting your issue.

• Why do you submit this issue?
• Question or discussion
• [√ ] Bug
• Requirement
• Feature or performance improvement

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Question

• What do you want to know?

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Bug

• jdk 8

• skywalking8.1.0

• Which company or project?

• What happened?
  My plugin uses async span. It is found that after the service has been running for a period of time, the number of reported span created exceeds the upper limit. After positioning, it is found that non async span will clear tracecontext when the last span is closed, but async span does not clear tracecontext

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Requirement or improvement

• Please describe your requirements or improvement suggestions.

[wu-sheng]

Is this an official plugin? Or your private one?

[liyanyan-dev]

It's not official. I wrote it myself

[wu-sheng]

Then. you seems missing to call stopSpan in the main context. Please follow the plugin dev document.

[liyanyan-dev]

I called the stopSpan in main context;I've solved this problem：

[wu-sheng]

No, this is absolutely the wrong way.

[liyanyan-dev]

OK, I'll check my plugin again