Dropped mutations are load shedding - somethings not happy. Are you seeing GC pauses?
What heap size and version? What memtable settings ? -- Jeff Jirsa > On Jul 2, 2018, at 12:48 AM, Hannu Kröger <hkro...@gmail.com> wrote: > > Yes, there are timeouts sometimes but more on the read side. And yes, there > are certain data modeling problems which will be soon addressed but we need > to keep things steady before we get there. > > I guess many write timeouts go unnoticed due to consistency level != ALL. > > Network looks to be working fine. > > Hannu > >> ZAIDI, ASAD A <az1...@att.com> kirjoitti 26.6.2018 kello 21.42: >> >> Are you also seeing time-outs on certain Cassandra operations?? If yes, you >> may have to tweak *request_timeout parameter in order to get rid of dropped >> mutation messages if application data model is not upto mark! >> >> You can also check if network isn't dropping packets (ifconfig -a tool) + >> storage (dstat tool) isn't reporting too slow disks. >> >> Cheers/Asad >> >> >> -----Original Message----- >> From: Hannu Kröger [mailto:hkro...@gmail.com] >> Sent: Tuesday, June 26, 2018 9:49 AM >> To: user <user@cassandra.apache.org> >> Subject: Problem with dropped mutations >> >> Hello, >> >> We have a cluster with somewhat heavy load and we are seeing dropped >> mutations (variable amount and not all nodes have those). >> >> Are there some clear trigger which cause those? What would be the best >> pragmatic approach to start debugging those? We have already added more >> memory which seemed to help somewhat but not completely. >> >> Cheers, >> Hannu >> >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org >> For additional commands, e-mail: user-h...@cassandra.apache.org >> >> >> --------------------------------------------------------------------- >> To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org >> For additional commands, e-mail: user-h...@cassandra.apache.org >> > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org > For additional commands, e-mail: user-h...@cassandra.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@cassandra.apache.org For additional commands, e-mail: user-h...@cassandra.apache.org
