kezhenxu94 commented on issue #3071: ThreadLocal need not to remove? URL: https://github.com/apache/skywalking/issues/3071#issuecomment-511194668 @dmsolr FYI, here is what the [JavaDoc (Jdk 1.7)](https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadLocal.html) says > Each thread holds an implicit reference to its copy of a thread-local variable as long as the thread is alive and the ThreadLocal instance is accessible; after a thread goes away, all of its copies of thread-local instances are subject to garbage collection (unless other references to these copies exist).
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