Hi! Thanks for the response. My cluster is in a bad state those recent days.
I have 29 CFs, and my disk is 5% full... So I guess the VMs still have more space to go, and I am not sure this is considered many CFs. But maybe I have memory issues. I enlarge cassandra memory from about ~2G to ~4G (out of ~8G). This was done because at that stage I had lots of key caches. I then reduced them to almost 0 on all CF. I guess now I can reduce the memory back to ~2 or ~3 G. Will that help? Thanks *Tamar Fraenkel * Senior Software Engineer, TOK Media [image: Inline image 1] ta...@tok-media.com Tel: +972 2 6409736 Mob: +972 54 8356490 Fax: +972 2 5612956 On Thu, Oct 11, 2012 at 10:46 PM, Tyler Hobbs <ty...@datastax.com> wrote: > On Wed, Oct 10, 2012 at 3:10 PM, Tamar Fraenkel <ta...@tok-media.com>wrote: > >> >> What I did noticed while looking at the logs (which are also running >> OpsCenter), is that there is some correlation between the dropped reads and >> flushes of OpsCenter column families to disk and or compactions. What are >> the rollups CFs? why is there so much traffic in them? > > > The rollups CFs hold the performance metric data that OpsCenter stores > about your cluster. Typically these aren't actually very high traffic > column families, but that depends on how many column families you have > (more CFs require more metrics to be stored). If you have a lot of column > families, you have a couple of options for reducing the amount of metric > data that's stored: > http://www.datastax.com/docs/opscenter/trouble_shooting_opsc#limiting-the-metrics-collected-by-opscenter > > Assuming you don't have a large number of CFs, your nodes may legitimately > be nearing capacity. > > -- > Tyler Hobbs > DataStax <http://datastax.com/> > >
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