Github user milleruntime commented on the issue:
https://github.com/apache/accumulo/pull/244
> I'm quite astounded that the benchmarks showed these changes are faster
than previous (notably, the SynchronizedFilter).
It is possible some of the changes are not improvements and the changes
that are useful are outperforming the negative ones. I don't think its
sensible to go through and run performance tests on each change individually
but if there are things that are obvious (like SynchronizedFilter), I can
remove it to see if it makes a difference.
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