Github user HeartSaVioR commented on the issue:
https://github.com/apache/storm/pull/2203
This patch adds new types of metrics on top of current metrics, so
performance hit is expected. (20% drop looks like not small indeed.) We may
want to consider not supporting smooth transition because of this.
Even we don't support smooth transition, we may want to comment all the old
metrics and re-run benchmark to measure real performance hit.---
