You are viewing a plain text version of this content. The canonical link for it is here.

Posted to user@cassandra.apache.org by David Hawthorne <dh...@gmx.3crowd.com> on 2011/09/02 20:30:07 UTC

JMX TotalReadLatencyMicros sanity check

I've graphed the rate of change of the TotalReadLatencyMicros counter over the last 12 hours, and divided by 1,000,000 to get it in seconds.  I'm grabbing it every 10 seconds, so I divided by another 10 to get per-second rates.

The result is that I have a CF doing 10 seconds of read *every second*.

Does that make sense?

If I divide it by the number of reads done, it matches up with the latency I'm seeing from cfstats:  1.5ms/read.