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https://issues.apache.org/jira/browse/FLINK-8410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tzu-Li (Gordon) Tai updated FLINK-8410:
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Priority: Minor (was: Major)
> Kafka consumer's commitedOffsets gauge metric is prematurely set
> ----------------------------------------------------------------
>
> Key: FLINK-8410
> URL: https://issues.apache.org/jira/browse/FLINK-8410
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Kafka, Runtime / Metrics
> Affects Versions: 1.3.2, 1.4.0, 1.5.0
> Reporter: Tzu-Li (Gordon) Tai
> Priority: Minor
>
> The {{committedOffset}} metric gauge value is set too early. It is set here:
> https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-kafka-0.9/src/main/java/org/apache/flink/streaming/connectors/kafka/internal/Kafka09Fetcher.java#L236
> This sets the committed offset before the actual commit happens, which varies
> depending on whether the commit mode is auto periodically, or committed on
> checkpoints. Moreover, in the 0.9+ consumers, the {{KafkaConsumerThread}} may
> choose to supersede some commit attempts if the commit takes longer than the
> commit interval.
> While the committed offset back to Kafka is not a critical value used by the
> consumer, it will be best to have more accurate values as a Flink-shipped
> metric.
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