Arseniy Tashoyan created FLINK-24851:
----------------------------------------
Summary: 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
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 settings _"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()_.
--
This message was sent by Atlassian Jira
(v8.20.1#820001)
