Github user ptgoetz commented on the pull request:
https://github.com/apache/storm/pull/1217#issuecomment-200591500
We're debating six versus one half dozen. Do we disable it by default and
explicitly tell users they have to turn it on for the UI functionality to work?
Or do we enable it by default and tell users to disable it per topology to
realize a small performance gain?
I could go either way, but the latter seems like a better user experience
for users new to the feature.
Also, the minor performance hit is eclipsed by the performance improvements
in 1.0. And it can be easily turned off. It just needs to be documented
clearly, IMO.
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