Github user HeartSaVioR commented on the issue:
I second @roshannaik. We're exposing possibilities as much as possible so
that users can compose users' topologies flexible, but as a trade-off we are
giving up chances for improving performance.
Yes it is clearly breaking change so I would like to hear voices on users
side, but if we can provide workaround (like thread-safety output collector
wrapper, regardless of its performance) I think we can decide and go on.
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