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Fixed thread local cleanup detected by IDEA. #9856

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Fixed thread local cleanup detected by IDEA. #9856

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2 changes: 1 addition & 1 deletion ...trap/src/main/java/datadog/trace/bootstrap/instrumentation/java/concurrent/TPEHelper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -101,7 +101,7 @@ public static AgentScope getAndClearThreadLocalScope(Runnable task) {
return null;
}
AgentScope scope = threadLocalScope.get();
threadLocalScope.set(null);
threadLocalScope.remove();
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@mcculls mcculls Nov 3, 2025 •
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IIRC the reason for calling set(null) here rather than remove was for performance reasons.

If we assume that the thread will activate another scope later on, it is better to leave the entry in the thread-local's map rather than continually grow and shrink the underlying map. TBH it would be even better to use a holder pattern here, and avoid any mutating of the thread-local once setup.

So please don't merge this for now - I'll put together a quick benchmark to demonstrate the difference.

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Thanks @mcculls! Your explanation is totally make sense. If benchmark will show that set(null) is better I will change my PR to put a comment why we have set(null).

return scope;
}

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