To test 0.8.1, I recently upgraded our kafka from 0.8-beta1 to 0.81. For the same config, I''ve noticed high cpu usage (20% to more than 70%) on several clusters. Our production is using 0.8-beta with the same configuration and does not have this issue. I wonder if other people have reported the similar issue. I downloaded the package from kafka website and did not compile it by myself.