joechen8...@gmail.com created KAFKA-7318:
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Summary: Should introduce a offset reset policy to consume only
the messages after subscribing
Key: KAFKA-7318
URL: https://issues.apache.org/jira/browse/KAFKA-7318
Project: Kafka
Issue Type: Improvement
Components: consumer
Affects Versions: 2.0.0, 1.1.1, 1.1.0
Reporter: joechen8...@gmail.com
On our situation, we want the consumers only consume the messages which was
produced after subscribing.
Currently, kafka support 3 policies with auto.offset.reset, but seems both of
them can not support the feature we want.
* {{latest}} (the default) , if a consumer subscribe a new topic and then
close, during these times, there are some message was produced, the consumer
can not poll these messages.
* earliest , consumer may consume all the messages on the topic before
subscribing.
* none, not in this scope.
Before version 1.1.0, we make the consumer poll and commit after subscribe as
below, this can mark the offset to 0 and works (enable.auto.commit is false) .
{code:java}
consumer.subscribe(topics, consumerRebalanceListener);
if(consumer.assignment().isEmpty()) {
consumer.poll(0);
consumer.commitSync();
}
{code}
After upgrade the clients to >=1.1.0, it is broke. Seems it was broke by the
fix
[KAFKA-6397|https://github.com/apache/kafka/commit/677881afc52485aef94150be50d6258d7a340071#diff-267b7c1e68156c1301c56be63ae41dd0],
but I am not sure about that. Then I try to invoke the
consumer.position(partitions) in onPartitionsAssigned of
ConsumerRebalanceListener, it works again. but it looks strangely that get the
position but do nothing.
so we want to know whether there is a formal way to do this, maybe introduce
another policy for auto.offset.reset to only consume the message after the
consumer subscribing is perfect.
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