Hi, Thanks for your reply.
I have debug logging on and see no GC pauses that are that long. GC pauses are all well below 1s and 99 times out of 100 below 100ms. Do I need to enable GC log options to see the pauses? I see plenty of these lines: DEBUG [ScheduledTasks:1] 2016-02-22 10:43:02,891 GCInspector.java (line 118) GC for ParNew: 24 ms for 1 collections as well as a few CMS GC log lines. Best regards, Joel 2016-02-23 15:14 GMT+01:00 Hannu Kröger <hkro...@gmail.com>: > Hi, > > Those are probably GC pauses. Memory tuning is probably needed. Check the > parameters that you already have customised if they make sense. > > http://blog.mikiobraun.de/2010/08/cassandra-gc-tuning.html > > Hannu > > > On 23 Feb 2016, at 16:08, Joel Samuelsson <samuelsson.j...@gmail.com> > wrote: > > Our nodes go down periodically, around 1-2 times each day. Downtime is > from <1 second to 30 or so seconds. > > INFO [GossipTasks:1] 2016-02-22 10:05:14,896 Gossiper.java (line 992) > InetAddress /109.74.13.67 is now DOWN > INFO [RequestResponseStage:8844] 2016-02-22 10:05:38,331 Gossiper.java > (line 978) InetAddress /109.74.13.67 is now UP > > I find nothing odd in the logs around the same time. I logged a ping with > timestamp and checked during the same time and saw nothing weird (ping is > less than 2ms at all times). > > Does anyone have any suggestions as to why this might happen? > > Best regards, > Joel > > >
