Re: commitlog_total_space_in_mb tuning

2017-07-09 Thread Nate McCall
> > > We're running with 128G memory and 30G heap size. Maybe it's good idea > to increase the commitlog_total_space. On the other hand, even with 8G > commitlog_total_space, replaying CL after restart takes more than 5 > minutes. > > In our case, the actual problem is it's causing lots of read re

Re: commitlog_total_space_in_mb tuning

2017-07-05 Thread Jay Zhuang
Thanks Jeff for the quick response. We're running with 3.0.13 which doesn't have commitlog_segment_recycling option. So it should be disabled. I think the CL flush is because commitlog full. The commitlog size is closing to 8G: #mbean = org.apache.cassandra.metrics:name=TotalCommitLogSize,type=Co

Re: commitlog_total_space_in_mb tuning

2017-07-05 Thread Jeff Jirsa
On 2017-07-05 14:32 (-0700), Jay Zhuang wrote: > Hi, > > commitlog_total_space_in_mb is increased from 1G to 8G in > CASSANDRA-7031. Sometimes we saw the number of dropped mutations spikes. > Not sure if it's a sign that we should increase the > commitlog_total_space_in_mb? 8G seems pretty ty

commitlog_total_space_in_mb tuning

2017-07-05 Thread Jay Zhuang
Hi, commitlog_total_space_in_mb is increased from 1G to 8G in CASSANDRA-7031. Sometimes we saw the number of dropped mutations spikes. Not sure if it's a sign that we should increase the commitlog_total_space_in_mb? For bean: org.apache.cassandra.metrics:name=WaitingOnSegmentAllocation,type=Commi