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https://issues.apache.org/jira/browse/KAFKA-19811?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18030966#comment-18030966
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Erik van Oosten commented on KAFKA-19811:
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Addition: when the consumer misses the just produced record, it will also not
see any record produced thereafter either.
> Acked record not immediately visible to consumer
> ------------------------------------------------
>
> Key: KAFKA-19811
> URL: https://issues.apache.org/jira/browse/KAFKA-19811
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 4.1.0
> Reporter: Erik van Oosten
> Priority: Minor
>
> h2. Steps to reproduce
> * program uses a single broker (we see the issue with an in-JVM embedded
> kafka server)
> * create a new topic with 1 partition
> * produce a record with {{acks=all}}
> * await acknowledgement from the broker
> * start a consumer (configured to read from beginning of topic)
> * spuriously, _the consumer never sees the record_
> The problem seems to occur more on a very busy server (e.g. a build server
> running many tests in parallel). We have not seen it on a modern laptop.
> A delay of 10ms after receiving the acknowledgement, and before starting the
> consumer, makes the record always visible.
> We observe this problem in ~1 in 6 runs of
> [zio-kafka|https://github.com/zio/zio-kafka]'s test suite, when run from a
> GitHub action. Since we run the test-suite for 3 different JVM versions, more
> than half of the zio-kafka builds fails due to this issue.
> h2. Expected behavior
> A record, produced with {{{}acks=all{}}}, of which producing was
> acknowledged, should be immediately visible for all consumers.
>
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