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https://issues.apache.org/jira/browse/FLINK-2944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14986320#comment-14986320
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Stephan Ewen commented on FLINK-2944:
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Yes, this is very valuable.
We should pass reporter classes similar to the ones used by the readers/writers
that count bytes/records. We can initially display them in the web UI as part
of the accumulators and later create a dedicates section for core metrics.
> Collect, expose and display operator-specific stats
> ---------------------------------------------------
>
> Key: FLINK-2944
> URL: https://issues.apache.org/jira/browse/FLINK-2944
> Project: Flink
> Issue Type: New Feature
> Components: Local Runtime, Webfrontend
> Reporter: Fabian Hueske
> Labels: requires-design-doc
>
> It would be nice to collect operator-specific stats such as:
> - HashJoin: bytes spilled build side, bytes spilled probe side, num keys
> (build / probe)
> - GroupBy: bytes spilled, num keys, max group size, avg. group size
> - Combiner: combine rate (in/out ratio)
> - Streaming Ops: avg. throughput
> - etc.
> and display these stats in the webUI.
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