Did you check STW GCs? You can do that with 'nodetool gcstats', by looking at the gc.log or observing GC related JMX metrics.
2017-03-20 8:52 GMT+01:00 Roland Otta <roland.o...@willhaben.at>: > we have a datacenter which is currently used exlusively for spark batch > jobs. > > in case batch jobs are running against that environment we can see very > high peaks in blocked native transport requests (up to 10k / minute). > > i am concerned because i guess that will slow other queries (in case > other applications are going to use that dc as well). > > i already tried increasing native_transport_max_threads + > concurrent_reads without success. > > during the jobs i cant find any resource limitiations on my hardware > (iops, disk usage, cpu, ... is fine). > > am i missing something? any suggestions how to cope with that? > > br// > roland > > >
