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https://issues.apache.org/jira/browse/FLINK-4210?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15378189#comment-15378189
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Stephan Ewen commented on FLINK-4210:
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I don't think that is too bad. Worst thing that can happen is that a user
closes the user-code-metricgroup.
> Move close()/isClosed() out of MetricGroup interface
> ----------------------------------------------------
>
> Key: FLINK-4210
> URL: https://issues.apache.org/jira/browse/FLINK-4210
> Project: Flink
> Issue Type: Improvement
> Components: Metrics
> Affects Versions: 1.1.0
> Reporter: Chesnay Schepler
> Assignee: Chesnay Schepler
> Priority: Minor
> Fix For: 1.1.0
>
>
> The (user-facing) MetricGroup interface currently exposes a close() and
> isClosed() method which generally users shouldn't need to call. They are an
> internal thing, and thus should be moved into the AbstractMetricGroup class.
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