Chesnay Schepler created FLINK-9789:
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Summary: Watermark metrics for an operator&task shadow each other
Key: FLINK-9789
URL: https://issues.apache.org/jira/browse/FLINK-9789
Project: Flink
Issue Type: Bug
Components: Metrics
Affects Versions: 1.5.1, 1.6.0
Reporter: Chesnay Schepler
Assignee: Chesnay Schepler
In FLINK-4812 we reworked the watermark metrics to be exposed for each operator.
In FLINK-9467 we made further modifications to also expose these metrics again
for tasks.
This works by re-using the input watermark gauge for the first operator in the
task chain, and the output watermark gauge for the last operator in the task
chain. This means that a single metric is registered multiple times.
Unfortunately, the metric system assumes metric objects to be unique, as can be
seen in virtually all reporter implementations as well as the
MetricQueryService.
As a result the watermark metrics override each other in the reporter, causing
only one to be reported, whichever was registered last.
FLINK-4812 was implemented for 1.5.1, so this would be a regression.
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