Minor Description
There is a behavioral change when you use MirrorMaker with the new consumer versus the old consumer with respect to regex parsing of the input topic list. If one combines a regex with a comma separated list for the topic list with old consumer implementation of MirrorMaker, it works ok. Example:
--whitelist '.+(my|mine),topic,anothertopic'
If you pass this in with the new consumer implementation, no topics are found. The workaround is to use something like:
--whitelist '.+(my|mine)|topic|anothertopic'
We should make an effort to be consistent between the two implementations as it's a bit surprising when migrating. I've verified the problem exists on 0.9.0.1 but I don't see at first any fix to the problem in later versions.
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