Thanks for the feedback.. Getting tons of OOM lately..
You mentioned overprovisioned heap size... well... tried 8GB = OOM tried 12GB = OOM tried 20GB w/ G1 = OOM (and long GC pauses usually over 2 secs) tried 20GB w/ CMS = running we're java 8 update 151. 3.11.1. We've got one table that's got a 400MB partition.. that's the max.. the 99th is < 100MB, and 95th < 30MB.. So I'm not sure that I'm overprovisioned, I'm just not quite yet to the heap size based on our partition sizes. All queries use cluster key, so I'm not accidentally reading a whole partition. The last place I'm looking - which maybe should be the first - is tombstones. sorry for the afternoon rant! thanks for your eyes! On Thu, Jun 28, 2018 at 5:54 PM, Elliott Sims <elli...@backblaze.com> wrote: > It depends a bit on which collector you're using, but fairly normal. Heap > grows for a while, then the JVM decides via a variety of metrics that it's > time to run a collection. G1GC is usually a bit steadier and less sawtooth > than the Parallel Mark Sweep , but if your heap's a lot bigger than needed > I could see it producing that pattern. > > On Thu, Jun 28, 2018 at 9:23 AM, Randy Lynn <rl...@getavail.com> wrote: > >> I have datadog monitoring JVM heap. >> >> Running 3.11.1. >> 20GB heap >> G1 for GC.. all the G1GC settings are out-of-the-box >> >> Does this look normal? >> >> https://drive.google.com/file/d/1hLMbG53DWv5zNKSY88BmI3Wd0ic >> _KQ07/view?usp=sharing >> >> I'm a C# .NET guy, so I have no idea if this is normal Java behavior. >> >> >> >> -- >> Randy Lynn >> rl...@getavail.com >> >> office: >> 859.963.1616 <+1-859-963-1616> ext 202 >> 163 East Main Street - Lexington, KY 40507 - USA >> <https://maps.google.com/?q=163+East+Main+Street+-+Lexington,+KY+40507+-+USA&entry=gmail&source=g> >> >> <https://www.getavail.com/> getavail.com <https://www.getavail.com/> >> > > -- Randy Lynn rl...@getavail.com office: 859.963.1616 <+1-859-963-1616> ext 202 163 East Main Street - Lexington, KY 40507 - USA <https://www.getavail.com/> getavail.com <https://www.getavail.com/>