high 99.9% latencies with leveldb backend
d at d2fn.com
Tue Oct 30 15:31:15 EDT 2012
Seeing 99th percentile put latencies at around 30-40 ms with 99.9th
percentile jumping all the way up to 3-4s. This is riak 1.1 with the
eleveldb backend on a 9-node cluster, N = 2, W = 1. Lots of free iops, but
CPU is consistently burning 30-40% across all 8 cores.
Wondering if this could be caused by leveldb compactions which, to my
knowledge, will wedge the scheduler for the duration of the compaction in
Any other thoughts for troubleshooting? Not a platform or erlang version
with dtrace support so that's out.
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