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https://issues.apache.org/jira/browse/FLINK-24851?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17443960#comment-17443960
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Arseniy Tashoyan commented on FLINK-24851:
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I propose the following precedence rule: settings by Builder API overwrite
settings by properties.
Example:
{code:scala}
val props = Map(
"bootstrap.servers" -> "localhost:9092",
"group.id" -> "group1",
"auto.offset.reset" -> "latest"
)
val kafkaSource = KafkaSource.builder[String]()
.setProperties(props)
.setBootstrapServers("remotehost:9092")
.build()
{code}
The code above results in the following effective configuration:
{code:none}
"bootstrap.servers" -> "remotehost:9092"
"group.id" -> "group1"
"auto.offset.reset" -> "latest"
{code}
1. "bootstrap.servers" - overwritten via Builder API
2. Other settings - as-is from the props
> 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
> Reporter: Arseniy Tashoyan
> Assignee: liwei li
> Priority: Major
> Labels: pull-request-available
>
> 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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