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From Tyler Hobbs <>
Subject Re: READ messages dropped
Date Thu, 11 Oct 2012 20:46:59 GMT
On Wed, Oct 10, 2012 at 3:10 PM, Tamar Fraenkel <> 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:

Assuming you don't have a large number of CFs, your nodes may legitimately
be nearing capacity.

Tyler Hobbs
DataStax <>

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