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https://issues.apache.org/jira/browse/BEAM-8549?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Maximilian Michels resolved BEAM-8549.
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Resolution: Fixed
> Buffered state during checkpointing may be keyed incorrectly
> ------------------------------------------------------------
>
> Key: BEAM-8549
> URL: https://issues.apache.org/jira/browse/BEAM-8549
> Project: Beam
> Issue Type: Bug
> Components: runner-flink
> Reporter: Maximilian Michels
> Assignee: Maximilian Michels
> Priority: Critical
> Fix For: 2.17.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> The current buffer logic for items emitted during checkpointing is faulty in
> the sense that the buffer is partitioned on the output keys of the operator.
> The key may be changed or even be dropped. Thus, the original key
> partitioning will not be maintained which will cause checkpointing to fail.
> An alternative solution would be BEAM-6733, but we may want to keep the
> current buffering logic in place. The proposed solution here is to remove the
> keyed buffering. The output buffer may then always be redistributed
> round-robin upon restoring from a checkpoint. Note that this is fine because
> no assumption can be made about the distribution of output elements of an
> operation.
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