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https://issues.apache.org/jira/browse/BEAM-2703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16141005#comment-16141005
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ASF GitHub Bot commented on BEAM-2703:
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Github user asfgit closed the pull request at:
https://github.com/apache/beam/pull/3758
> KafkaIO: watermark outside the bounds of BoundedWindow
> ------------------------------------------------------
>
> Key: BEAM-2703
> URL: https://issues.apache.org/jira/browse/BEAM-2703
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-extensions
> Reporter: Chris Pettitt
> Assignee: Raghu Angadi
>
> KafkaIO appears to use an incorrect lower bound for it's initial watermark
> with respect to BoundedWindow.TIMESTAMP_MIN_VALUE.
> KafkaIO's initial watermark:
> new Instant(Long.MIN_VALUE) -> -9223372036854775808
> BoundedWindow.TIMESTAMP_MIN_VALUE:
> new Instant(TimeUnit.MICROSECONDS.toMillis(Long.MIN_VALUE)) ->
> -9223372036854775
> The difference is that the last three digits have been truncated due to the
> micro to millis conversion.
> This difference can cause errors in runners that assert that the input
> watermark can never regress as KafkaIO gives a value below the lower bound
> when no messages have been received yet. For consistency it would probably be
> best for it to use BoundedWindow.TIMESTAMP_MIN_VALUE.
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