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https://issues.apache.org/jira/browse/SPARK-21195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16240267#comment-16240267
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Robert Kruszewski commented on SPARK-21195:
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What's the justification for `won't fix` here?
> MetricSystem should pick up dynamically registered metrics in sources
> ---------------------------------------------------------------------
>
> Key: SPARK-21195
> URL: https://issues.apache.org/jira/browse/SPARK-21195
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 2.1.1
> Reporter: Robert Kruszewski
> Priority: Minor
>
> Currently when MetricsSystem registers a source it only picks up currently
> registered metrics. It's quite cumbersome and leads to a lot of boilerplate
> to preregister all metrics especially with systems that use instrumentation.
> This change proposes to teach MetricsSystem to watch metrics added to sources
> and dynamically register them
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