Github user billierinaldi commented on the issue:
https://github.com/apache/accumulo/pull/255
I figure there are two possibilities, 1) the sendMutations span isn't
always created, which would be bad, or 2) the span is created, but it's dropped
sometimes because it's of length 0ms. It could be the latter, since I see
sendMutations was 1ms for one of the sample traces posted. We could eliminate
the second possibility by configuring the span receiver not to drop 0ms spans
for this test. This can be done by setting tracer.span.min.ms to 0 (default
value is 1) in the accumulo conf.
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