We deployed a brand new 13 node 2.1.4 C* cluster and used sstabloader to stream
about 500GB into cassandra. The streaming took less than a day but afterwards
pending compactions do not decrease. The Cassandra nodes (which have about
500 pending compactions each) seem to spend most of their time in
IntervalTree.comparePoints() and in
CompactionController.maxPurgegableTimestamp()
(sometimes, too, in
com.google.common.util.concurrent.Uninterruptibles.sleepUninteruptedly()).
That's what Java VisualVM shows that they're doing in the sampler.
Many of the nodes show 100% cpu usage per core.
Any idea what's causing it to hang?
Might http://qnalist.com/questions/5818079/reasons-for-nodes-not-compacting or
https://issues.apache.org/jira/browse/CASSANDRA-8914 explain it? Altering the
table to use , 'cold_reads_to_omit': 0.0 didn't help.
Thanks, Don
Donald A. Smith | Senior Software Engineer
P: 425.201.3900 x 3866
C: (206) 819-5965
F: (646) 443-2333
dona...@audiencescience.com<mailto:dona...@audiencescience.com>
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