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https://issues.apache.org/jira/browse/FLINK-26417?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Danny Cranmer resolved FLINK-26417.
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Resolution: Not A Problem
> Async Sink can violate At Least Once processing during checkpointing
> --------------------------------------------------------------------
>
> Key: FLINK-26417
> URL: https://issues.apache.org/jira/browse/FLINK-26417
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Common
> Reporter: Danny Cranmer
> Assignee: Ahmed Hamdy
> Priority: Blocker
> Labels: pull-request-available
> Fix For: 1.15.0
>
>
> Async Sink holds data to send in 2 places:
> - Buffered in queue
> - "In-flight", being submitted by the async writer
> When checkpointing we only capture the buffered requests. It seems like the
> code to [wait for in-flight requests to
> complete|https://github.com/apache/flink/blob/aab253a9141f1cdff81658eb47c7bb6ee9d2105c/flink-connectors/flink-connector-base/src/main/java/org/apache/flink/connector/base/sink/writer/AsyncSinkWriter.java#L402-L420]
> has been removed/
> Reinstate this mechanism to wait for in-flight requests to flush within
> {{prepareCommit}}. There is even.
> [comment|https://github.com/apache/flink/blob/master/flink-connectors/flink-connector-base/src/main/java/org/apache/flink/connector/base/sink/writer/AsyncSinkWriter.java#L45]
> to state this is supported.
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