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https://issues.apache.org/jira/browse/FLINK-7758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16209400#comment-16209400
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ASF GitHub Bot commented on FLINK-7758:
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Github user zentol commented on the issue:
https://github.com/apache/flink/pull/4769
As I said, it is better to return an `UnregisteredMetricsGroup`. The
current solution will blow up the moment the returned group is used, and can't
be guarded against with null checks.
> Fix bug Kafka09Fetcher add offset metrics
> -------------------------------------------
>
> Key: FLINK-7758
> URL: https://issues.apache.org/jira/browse/FLINK-7758
> Project: Flink
> Issue Type: Bug
> Components: Kafka Connector, Metrics
> Affects Versions: 1.3.2
> Reporter: Hai Zhou UTC+8
> Assignee: Hai Zhou UTC+8
> Fix For: 1.4.0
>
>
> in Kafka09Fetcher, add _KafkaConsumer_ kafkaMetricGroup.
> No judgment that the useMetrics variable is true.
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