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https://issues.apache.org/jira/browse/FLINK-6453?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Konstantin Knauf updated FLINK-6453:
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Labels: (was: stale-major)
Removed "stale-critical|major|minor" label in line with
https://issues.apache.org/jira/browse/FLINK-22429.
> Web UI metrics charts should update only when a new data point is available
> ---------------------------------------------------------------------------
>
> Key: FLINK-6453
> URL: https://issues.apache.org/jira/browse/FLINK-6453
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Web Frontend
> Reporter: Stephan Ewen
> Priority: Major
>
> Metrics are pulled by the web server every 10 seconds by default.
> The metric charts update more frequently and pull new events.
> The charts assume that these are new data points, when in fact, they are
> mostly not. Drawing the same datapoint again to a different time makes all
> charts look stepwise, which is misleading:
> There are some cases where metrics in fact increase stepwise (for example num
> events in bursty event channels) and currently there is no way to tell the
> difference.
> A way around that would be to plot data points only if there are new data
> points. Identifying new data points can be done via attaching sequence
> numbers in the metrics handlers (incremented whenever the metrics are
> re-requested from TMs). The chart can ignore data points with the same
> sequence number.
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