Hi,
I'm trying to setup a production environment with Riak as backend.
Unfortunately I have very slow write times that bottleneck my whole system.
Here is a sample of one of my node (riak-admin status | grep -e
'^node_put_fsm_time'):
node_put_fsm_time_100 : 3305516
node_put_fsm_time_95 : 230589
node_put_fsm_time_99 : 1694593
node_put_fsm_time_mean : 79864
node_put_fsm_time_median : 14973
As you can see, I have really good times for most of my writes, yet the
mean time is not so good because a few writes are taking long (Up to 3
seconds)
How can I get rid of those slow insert ? Is that intended/normal ?
My setup is the following:
5 hosts (2CPU, %Cpu(s): 47,1 us, 1,3 sy, 0,0 ni, 51,3 id, 0,0 wa,
0,0 hi, 0,2 si, 0,0 st) , ring_size: 128, aae disabled.
Writes are w=1 dw=0
each host has 32go of ram, that is almost used for system caching only.
My data are stored on an openstack volume that support up to 3000IOPS.
Here is an iostat sample for 1 minute:
avg-cpu: %user %nice %system %iowait %steal %idle
38.00 0.00 1.81 0.03 0.08 60.07
Device: tps kB_read/s kB_wrtn/s kB_read kB_wrtn
vda 0.37 0.00 2.27 0 136
vdb 9.60 0.00 294.53 0 17672
Thanks,
Guilaume BODDAERT
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