Tzu-Li (Gordon) Tai created FLINK-4080:
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Summary: Kinesis consumer not exactly-once if stopped in the
middle of processing aggregated records
Key: FLINK-4080
URL: https://issues.apache.org/jira/browse/FLINK-4080
Project: Flink
Issue Type: Sub-task
Components: Kinesis Connector, Streaming Connectors
Reporter: Tzu-Li (Gordon) Tai
Assignee: Tzu-Li (Gordon) Tai
Priority: Critical
Fix For: 1.1.0
I've occasionally experienced unsuccessful ManualExactlyOnceTest after several
tries.
Kinesis records of the same aggregated batch will have the same sequence
number, and different sub-sequence numbers
(http://docs.aws.amazon.com/streams/latest/dev/kinesis-kpl-consumer-deaggregation.html).
The current state of the consumer is committing state every time it finishes
processing a record, even de-aggregated ones. This is a bug since this will
incorrectly mark all remaining records of the de-aggregated batch as processed
in the state.
Proposed fix: Use the extended `UserRecord` class in KCL to represent all
records (either non- or de-aggregated) instead of the basic `Record` class.
This gives access to whether or not the record was originally aggregated. If we
encounter a de-aggregated record, don't update state until we finished
processing the last record of the batch.
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