Matthias J. Sax created KAFKA-4393:
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Summary: Improve invalid/negative TS handling
Key: KAFKA-4393
URL: https://issues.apache.org/jira/browse/KAFKA-4393
Project: Kafka
Issue Type: Improvement
Components: streams
Reporter: Matthias J. Sax
Assignee: Matthias J. Sax
Fix For: 0.10.2.0
Currently, Kafka Streams does not handle invalid/negative timestamps returned
from the {{TimestampExtractor}} gracefully, but fails with an exception. Input
record timestamps determine output record timestamps and {{KafkaProducer}} does
not allow negative timestamps to get written.
Besides the exception issues describe above, negative timestamp can also not
get handled in a meaningful way for any time based (ie, window) operators like
window aggregates and joins.
Thus, we want to change Stream to a auto-drop behavior for negative timestamps
and not process those records at all (without any further user notification
about dropped record). To guard the user from silently dropping messages, we
change the default extractor {{ConsumerRecordTimestampExtractor}} to check the
extracted meta-data record timestamp and raise an exception if it is negative.
Furthermore, we add a "drop-and-log" extractor, as this seems to be a common
behavior user might want to have. For any other behavior, users can still
provide a custom TS-Extractor implementation.
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