Yes, the average metrics obtained via JMX are exponentially smoothed. You can get more accurate counters via a thrift call to the master, and you can trace specific calls to get fine-grained time information for all parts of a specific transaction.
-Eric On Fri, Mar 1, 2013 at 9:26 AM, Brandon Wilson <[email protected] > wrote: > I have a question regarding the JMX metrics exposed by Accumulo. I believe > the metrics that are reported as averages (e.g., ScanAvgTime) are computed > as weighted averages over all time, as opposed to a arithmetic mean of a > set of scan times over a given time window. Am I correct that the weighted > average calculation is actual the weighted average since the tserver > started? > > The average formula I suspect is being use is here: > http://grepcode.com/file/repo1.maven.org/maven2/org.apache.accumulo/accumulo-server/1.4.0/org/apache/accumulo/server/metrics/AbstractMetricsImpl.java#AbstractMetricsImpl.Metric.addAvg%28long%29<https://myremote.mitre.org/owa/,DanaInfo=imc.mitre.org,SSL+redir.aspx?C=c6-KKQhSR0qXLqfNtF0WFWOUgfkZ6s8ILg3UmiJgkZ-j_nin7It-AddWEsRTPiKlFa7QDfn4H8s.&URL=http%3a%2f%2fgrepcode.com%2ffile%2frepo1.maven.org%2fmaven2%2forg.apache.accumulo%2faccumulo-server%2f1.4.0%2forg%2fapache%2faccumulo%2fserver%2fmetrics%2fAbstractMetricsImpl.java%23AbstractMetricsImpl.Metric.addAvg%2528long%2529> > > Am I on the right track here? > > -Brandon >
