[jira] [Updated] (FLINK-24851) KafkaSourceBuilder: auto.offset.reset is ignored

["Arseniy Tashoyan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-24851?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Arseniy Tashoyan updated FLINK-24851:
-------------------------------------
    Affects Version/s: 1.15.0

> KafkaSourceBuilder: auto.offset.reset is ignored
> ------------------------------------------------
>
>                 Key: FLINK-24851
>                 URL: https://issues.apache.org/jira/browse/FLINK-24851
>             Project: Flink
>          Issue Type: Bug
>          Components: Connectors / Kafka
>    Affects Versions: 1.14.0, 1.15.0
>            Reporter: Arseniy Tashoyan
>            Assignee: liwei li
>            Priority: Major
>              Labels: pull-request-available, stale-assigned
>
> Creating KafkaSource like this:
> {code:scala}
> val props = new Properties()
> props.put("bootstrap.servers", "localhost:9092")
> props.put("group.id", "group1")
> props.put("auto.offset.reset", "latest")
> val kafkaSource = KafkaSource.builder[String]()
>       .setProperties(props)
>       .build()
> {code}
> The actually used value for _"auto.offset.reset"_ is *"earliest"* instead of configured *"latest"*.
> This occurs because _"auto.offset.reset"_ gets overridden by _startingOffsetsInitializer.getAutoOffsetResetStrategy().name().toLowerCase()_. The default value for _startingOffsetsInitializer_ is _"earliest"_.
> This behavior is misleading.
> This behavior imposes an inconvenience on configuring the Kafka connector. We cannot use the Kafka setting _"auto.offset.reset"_ as-is. Instead we must extract this particular setting from other settings and propagate to _KafkaSourceBuilder.setStartingOffsets()_:
> {code:scala}
> val kafkaSource = KafkaSource.builder[String]()
>       .setProperties(props)
>       .setStartingOffsets(
>         OffsetsInitializer.committedOffsets(
>           OffsetResetStrategy.valueOf(
>             props.get(ConsumerConfig.AUTO_OFFSET_RESET_CONFIG)
>               .asInstanceOf[String]
>               .toUpperCase(Locale.ROOT)
>           )
>         )
>       )
>       .build()
> {code}
> The expected behavior is to use the value of _"auto.offset.reset"_ provided by _KafkaSourceBuilder.setProperties()_ - unless overridden via _KafkaSourceBuilder. setStartingOffsets()_.



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