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https://issues.apache.org/jira/browse/FLINK-4192?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15389776#comment-15389776
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ASF GitHub Bot commented on FLINK-4192:
---------------------------------------
Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2226
Had a quick offline discussion with @zentol and @aljoscha with the outcome:
- Make `flink-metrics-core` strictly the metrics API project for Metrics
and Reporters
- Move all implementations of the metric groups and the MetricRegistry to
`flink-runtime`.
- `flink-core` is actually metric free and depends on the metric API
project only.
Users that want to implement reporters only refer to `flink-metrics-core`.
For tests, a dependency to `flink-runtime` is needed.
We may move further classes to `flink-metric-core` in the future to reduce
test dependencies on `flink-runtime`, but that is an open issue at this point.
> Move Metrics API to separate module
> -----------------------------------
>
> Key: FLINK-4192
> URL: https://issues.apache.org/jira/browse/FLINK-4192
> Project: Flink
> Issue Type: Improvement
> Components: Metrics
> Affects Versions: 1.1.0
> Reporter: Chesnay Schepler
> Assignee: Chesnay Schepler
> Fix For: 1.1.0
>
>
> All metrics code currently resides in flink-core. If a user implements a
> reporter and wants a fat jar it will now have to include the entire
> flink-core module.
> Instead, we could move several interfaces into a separate module.
> These interfaces to move include:
> * Counter, Gauge, Histogram(Statistics)
> * MetricGroup
> * MetricReporter, Scheduled, AbstractReporter
> In addition a new MetricRegistry interface will be required as well as a
> replacement for the Configuration.
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