It saves a lot of information for each request thats traced so there is significant overhead. If you start at a low probability and move it up based on the load impact it will provide a lot of insight and you can control the cost.
--- Chris Lohfink On Fri, Nov 7, 2014 at 11:35 AM, Jimmy Lin <y2klyf+w...@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)? > > More sampling seems better but then doing so may also slow down the system > in some other ways? > > thanks > > >
