Fabian Paul created FLINK-26118:
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Summary: AsyncSinks do not support downscaling with state
Key: FLINK-26118
URL: https://issues.apache.org/jira/browse/FLINK-26118
Project: Flink
Issue Type: Bug
Components: Connectors / Common
Affects Versions: 1.15.0
Reporter: Fabian Paul
Currently, the AsyncSinkWriter assumes to always be restored exactly from only
one previous writer state but in case of a downscaling after a snapshot a
writer will receive multiple states.
https://github.com/apache/flink/blob/c60eb0c3b4bf7dc045dd7a1da2080c7befebb8dc/flink-connectors/flink-connector-base/src/main/java/org/apache/flink/connector/base/sink/writer/AsyncSinkWriter.java#L438
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