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From "Tzu-Li (Gordon) Tai (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (FLINK-8410) Kafka consumer's commitedOffsets gauge metric is prematurely set
Date Fri, 31 Jan 2020 17:42:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-8410?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tzu-Li (Gordon) Tai reassigned FLINK-8410:
------------------------------------------

    Assignee:     (was: Tzu-Li (Gordon) Tai)

> 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: Major
>
> 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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