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From Anchit Jatana <development.anc...@gmail.com>
Subject Flink Metrics - InfluxDB + Grafana | Help with query influxDB query for Grafana to plot 'numRecordsIn' & 'numRecordsOut' for each operator/operation
Date Fri, 28 Oct 2016 21:53:25 GMT
Hi All,

I'm trying to plot the flink application metrics using grafana backed by
influxdb. I need to plot/monitor the 'numRecordsIn' & 'numRecordsOut' for
each operator/operation. I'm finding it hard to generate the influxdb query
in grafana which can help me make this plot.

I am able to plot the 'numRecordsIn' & 'numRecordsOut' for each
subtask(parallelism set to 50) of the operator but not the operator as a
whole.

If somebody has knowledge or has successfully implemented this kind of a
plot on grafana backed by influxdb, please share with me the process/query
to achieve the same.

Below is the query which I have to monitor the 'numRecordsIn' &
'numRecordsOut' for each subtask

SELECT derivative(sum("count"), 10s) FROM "numRecordsOut" WHERE "task_name"
= 'Source: Reading from Kafka' AND "subtask_index" =~ /^$subtask$/ AND
$timeFilter GROUP BY time(10s), "task_name"

PS: $subtask is the templating variable that I'm using in order to have
multiple subtask values. I have tried the 'All' option for this templating
variable- This give me an incorrect plot showing me negative values while
the individual selection of subtask values when selected from the
templating variable drop down yields correct result.

Thank you!

Regards,
Anchit

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