Kyle Weaver created BEAM-11212:
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Summary: Beam metrics should be displayed in Flink UI "Metrics" tab
Key: BEAM-11212
URL: https://issues.apache.org/jira/browse/BEAM-11212
Project: Beam
Issue Type: Wish
Components: runner-flink
Reporter: Kyle Weaver
All Beam metrics are visible in the Flink UI in a single accumulator value (in
the "Accumulators" tab), which is a large, hard-to-read blob. Originally, this
blob was rendered in a bespoke format
(https://github.com/apache/beam/blob/ead80b469ffeeddcd8e9e5c8dc462eec0b0ffc6b/sdks/java/core/src/main/java/org/apache/beam/sdk/metrics/MetricQueryResults.java#L63-L72).
I changed the format to JSON so it could be easily deserialized (BEAM-9600).
But then an issue was filed (BEAM-10294) reporting that the new JSON format was
harder to read than the original bespoke format. The temporary fix was to
revert to the bespoke format in Spark, while allowing Flink to continue to use
JSON. However, if Beam metrics in Flink are only visible as an accumulator,
then they are also unreadable because the payloads are in binary form
(BEAM-10719).
Having metrics visible in Flink's "Metrics" tab would A) make metrics easier to
read (even compared to the bespoke accumulator string format), and closer to
what users of Beamless Flink expect, and B) free us to use the accumulator
however we wish for Beam internal purposes, without worrying about readability.
One question I'm not sure about is, why can't we see Beam metrics in the Flink
UI already? I thought we were already translating Beam metrics into Flink
native metrics
(https://github.com/apache/beam/blob/ea2a3f6896b66a2852a2ff3d82f4e1b010013d13/runners/flink/src/main/java/org/apache/beam/runners/flink/metrics/FlinkMetricContainer.java#L108-L109).
Is there something else we need to do to display them in the UI?
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