On Fri, Nov 7, 2014 at 9:35 AM, Jimmy Lin <y2klyf+work@gmail.com> wrote:
is there any significant  performance penalty if one turn on Cassandra query tracing, through DataStax java driver (say, per every query request of some trouble query)?

What does 'significant' mean in your sentence? I'm pretty sure the answer for most meanings of it is "no."