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https://issues.apache.org/jira/browse/FLINK-4064?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15327359#comment-15327359
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Chesnay Schepler commented on FLINK-4064:
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This would effectively mean a mandatory additional hash-lookup if a metric is
supposed to be gathered within onElement.This seems quite wasteful.
can't users store the metric in a field within the trigger and check for null
in every call? it's more boiler-plate code but should be more efficient.
> Allow calling MetricGroup methods multiple times
> ------------------------------------------------
>
> Key: FLINK-4064
> URL: https://issues.apache.org/jira/browse/FLINK-4064
> Project: Flink
> Issue Type: Sub-task
> Components: Metrics
> Affects Versions: 1.1.0
> Reporter: Aljoscha Krettek
>
> Right now, the methods on {{MetricGroup}} can only be called once, i.e. I
> have to keep the result of {{MetricGroup.counter(name)}} and use that to
> report metrics. For some cases, such as adding metrics support in triggers,
> it is necessary to allow calling a method multiple times and return the same
> metric object. On the first call, a new metric object would be created,
> subsequent calls would return that metric object.
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