Github user joshelser commented on the issue:
https://github.com/apache/accumulo/pull/255
> So this is the guy causing us problems in Tracer.java:
Ah, so that ThreadLocal is designed so that we can transparently pick up
the "current" thread. When we spawn a new thread, we need to pass along the
current spanId to that child. I'm pretty sure we already have wrappers for
`Runnable` to do this -- maybe they just weren't used?
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