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https://issues.apache.org/jira/browse/KAFKA-8021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16781820#comment-16781820
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Sriharsha Chintalapani commented on KAFKA-8021:
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[~amendhekar] have you noticed this issue with the latest release of 2.1.1
> KafkaProducer.flush() can show unexpected behavior when a batch is split
> ------------------------------------------------------------------------
>
> Key: KAFKA-8021
> URL: https://issues.apache.org/jira/browse/KAFKA-8021
> Project: Kafka
> Issue Type: Bug
> Components: clients, producer
> Affects Versions: 0.11.0.0
> Reporter: Abhishek Mendhekar
> Assignee: Abhishek Mendhekar
> Priority: Major
>
> KafkaProducer.flush() marks the flush in progress and then waits for all
> incomplete batches to be completed (waits on the producer batch futures to
> finish).
> The behavior is seen when a batch is split due to MESSAGE_TOO_LARGE exception.
> The large batch is split into smaller batches (2 or more) but
> ProducerBatch.split() marks the large batch future as complete before adding
> the new batches in the incomplete list of batches. At this time if the
> KafkaProducer.flush() is called then it'll make a copy of existing incomplete
> list of batches and waits for them to complete while ignoring the large batch
> that was split into smaller batches.
>
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