Kenneth Knowles created BEAM-13715:
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Summary: Kafka commit offset drop data on failure for runners that
have non-checkpointing shuffle
Key: BEAM-13715
URL: https://issues.apache.org/jira/browse/BEAM-13715
Project: Beam
Issue Type: Bug
Components: io-java-kafka
Affects Versions: 2.35.0, 2.34.0, 2.33.0, 2.32.0, 2.31.0, 2.30.0, 2.29.0,
2.28.0, 2.27.0, 2.26.0, 2.36.0
Reporter: Kenneth Knowles
A user noticed that we commit Kafka offsets without any obvious checkpointing.
We use a {{Reshuffle.byRandomKey()}} to cause Dataflow and the SparkRunner to
checkpoint. But on runners with non-checkpointing shuffle, this risks data loss.
The modern solution is to use {{{}@RequiresStableInput{}}}. This is not
perfectly/fully implemented across many runners, so we still need the explicit
shuffle for now.
https://stackoverflow.com/questions/70785672/apache-beam-kafkaio-commit-offset-behaviour
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