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Posted to commits@beam.apache.org by "Chris Pettitt (JIRA)" <ji...@apache.org> on 2017/07/31 20:22:00 UTC
[jira] [Created] (BEAM-2703) KafkaIO: watermark outside the bounds
of BoundedWindow
Chris Pettitt created BEAM-2703:
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Summary: 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: Davor Bonaci
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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