Chesnay Schepler created FLINK-4772:
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Summary: Store metrics in MetricStore as strings
Key: FLINK-4772
URL: https://issues.apache.org/jira/browse/FLINK-4772
Project: Flink
Issue Type: Improvement
Components: Metrics, Webfrontend
Affects Versions: 1.1.2
Reporter: Chesnay Schepler
Assignee: Chesnay Schepler
Fix For: 1.2.0
The MetricStore is a nested structure which stores metrics in several
Map<String, Object> objects. The key is the name of the metric, while the value
is the value of the metric. Since gauges are transmitted as Strings, and all
other metric types are of numeric nature, the type of the value is limited to
Strings and Numbers.
Storing them with different types however has no benefit, and makes working
with the MetricStore needlessly complicated since one is forced to cast every
retrieved metric. This also implies that one either has to know what kind of
metric you're dealing with (which can easily go wrong), or check the type
before using the metric, which is cumbersome.
As such i propose storing all metrics as strings.
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