On Mon, Jul 6, 2015 at 4:19 PM, Venkatesh Kandaswamy <ve...@walmartlabs.com>
wrote:
> I cannot find documentation on the last two parameters given by
> cfstats below. It looks like most examples show 0 for these metrics, but
> our table has large numbers. What do these mean?
> Average live cells per slice (last five minutes): 2.0
> Average tombstones per slice (last five minutes): 60.0
>
They mean what they say they mean?
For each "slice" (which is a weird legacy thriftism you should be able to
parse as "request" in this context) there was an average of 2 un-masked
("live") cells read and 60 cells which were masked ("tombstones").
This is a pretty bad ratio, and suggests that your design does UPDATE-like
operations, which are not being merged fast enough by compaction to avoid
you reading past them.
=Rob
