Missed to cc to user@flink.apache.org
Hi, > > Just wondering what is the value of that counter (wo/ applying > NonNegativeDerivative > function) when you observe the spikes? If I remember correctly, Grafana > is known to aggregate those values by averaging them across the time > duration selected before rendering to the front-end. The charts show value > across multiple days, and what values do that metric stand at minute scale? > > Regards, > > Michael > > On Sun, Sep 17, 2017 at 9:17 PM, Philipp Bussche < > philipp.buss...@gmail.com> wrote: > >> Hi there, I witnessed an interesting behaviour on my Grafana dashboard >> where >> sink related metrics would show activity where there should not be any. I >> am >> saying this because for this particular sink activity is triggered by data >> being ingested through a cronjob at a particular time, however the >> dashboard >> is saying there is activity also outside this time. >> I had a closer look and in my graph I am using the NonNegativeDerivative >> function (the data actually sits in Graphite) on the metric. Disabling >> this >> filter shows that for a short period of time the numRecordsIn counter is >> dropping and then gets back to the previous value. This drop is then shown >> on the graph and is looking like data activity because of the >> NonNegativeDerivative function. >> Why would the value of a counter temporarily decrease and then go back to >> its previous level ? >> Please see screenshots attached. >> >> Thanks >> Philipp >> >> <http://apache-flink-user-mailing-list-archive.2336050.n4. >> nabble.com/file/t576/Sink_numRecordsIn_NonNegativeDerivative_.png> >> <http://apache-flink-user-mailing-list-archive.2336050.n4. >> nabble.com/file/t576/Sink_numRecordsIn_Value_Drops.png> >> >> >> >> -- >> Sent from: http://apache-flink-user-mailing-list-archive.2336050.n4. >> nabble.com/ >> > >
