Till Rohrmann created FLINK-7876:
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Summary: Register TaskManagerMetricGroup under ResourceID instead
of InstanceID
Key: FLINK-7876
URL: https://issues.apache.org/jira/browse/FLINK-7876
Project: Flink
Issue Type: Improvement
Components: Metrics
Affects Versions: 1.4.0
Reporter: Till Rohrmann
Assignee: Till Rohrmann
Priority: Minor
Currently, the {{TaskManager}} registers the {{TaskManagerMetricGroup}} under
its {{InstanceID}} and thereby binding its metrics effectively to the lifetime
of its registration with the {{JobManager}}. This has also implications how the
REST handler retrieve the TaskManager metrics, namely by its {{InstanceID}}.
I would actually propose to register the {{TaskManagerMetricGroup}} under the
{{TaskManager}}/{{TaskExecutor}} {{ResourceID}} which is valid over the whole
lifetime of the {{TaskManager}}/{{TaskExecutor}}. That way we would also be
able to query metrics independent of the connection status to the
{{JobManager}}.
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