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https://issues.apache.org/jira/browse/FLINK-7758?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16209403#comment-16209403
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ASF GitHub Bot commented on FLINK-7758:
---------------------------------------
Github user zentol commented on the issue:
https://github.com/apache/flink/pull/4769
The current solution also straight up doesn't work:
```
java.lang.ClassCastException: java.lang.Object cannot be cast to
org.apache.flink.metrics.MetricGroup
at
org.apache.flink.streaming.connectors.kafka.internals.AbstractFetcher.registerOffsetMetrics(AbstractFetcher.java:555)
at
org.apache.flink.streaming.connectors.kafka.internal.Kafka09Fetcher.<init>(Kafka09Fetcher.java:99)
at
org.apache.flink.streaming.connectors.kafka.internal.Kafka09FetcherTest.testCancellationWhenEmitBlocks(Kafka09FetcherTest.java:376)
```
> 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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