conflicts between consumer groups? seeing many duplicate records

[Jon Yeargers <jo...@cedexis.com>]

Is it possible that using the same group name for two topics could cause a
conflict?

I have a situation where Im seeing vast numbers of records (more than 2x)
get duplicated in a topic. I was looking at consumer lag using
'kafka-consumer-groups ... --new-consumer' and noticed that I had another
app using the same group name for a different (much smaller) topic.

Would increasing partitions have an effect like this?

Added 33% more partitions to a topic yesterday and all sorts of havoc
occurred.

using 0.10.1.0