Red Hat Bugzilla – Bug 1026651
RHQ storage alerts for JVM heap > 75% fire fairly regularly
Last modified: 2014-09-16 19:50:07 EDT
Created attachment 819546 [details]
Description of problem:
I have a two node test cluster, serving about 200 agents. The heap size hovers around 50% for both Cassandra servers, but sometimes inches up to 80%. The 'max' is around 80% and hasn't gone over. I have about 5GB of heap for both nodes, so there is plenty of size.
I don't think it's a concern, so I'd rather only get alerted if heap > 90% or something really critical.
See the attached screenshot.
Version-Release number of selected component (if applicable): 4.9
How reproducible: Daily or so
I haven't seen this problem anymore. Hmm.
Just for kicks, I increased from 5GB of heap to 8GB of heap.
Heap increase period (when heap steadily increases then drops):
5GB: 6 hours
8GB: 12 hours
This is 8000 metrics/minute, single RHQ instance and 2 instances of Cassandra.
I have four (well eight) instances of Cassandra and not a problem.