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From Jonathan Ellis <>
Subject Re: read/write latency definition
Date Wed, 16 Dec 2009 21:35:21 GMT
On Wed, Dec 16, 2009 at 1:03 PM, Brian Burruss <> wrote:
> what exactly is the definition of latency as reported by tpstats?

You mean cfstats, right?

That's the latency from when the request arrived at the right server,
to read the requested data.

> is it the complete time spent in the cassandra server, minus sending response to client?

Nope.  We track that globally in StorageProxy, and it is exposed via
JMX, but not via nodeprobe.  (Adding that would be easy tho, if you
wanted to do it.)


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