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https://issues.apache.org/jira/browse/FLINK-21452?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17291153#comment-17291153
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Arvid Heise commented on FLINK-21452:
-------------------------------------
Merged as fb99ce2e22ca84dece1f7a431a92a4cecb6a71f2^ in 1.12 and as
81cfe465c9e4a17e563e1b4c02cd60a63b984de5^ in master.
> FLIP-27 sources cannot reliably downscale
> -----------------------------------------
>
> Key: FLINK-21452
> URL: https://issues.apache.org/jira/browse/FLINK-21452
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Common
> Affects Versions: 1.12.1, 1.13.0
> Reporter: Arvid Heise
> Assignee: Arvid Heise
> Priority: Critical
> Labels: pull-request-available
> Fix For: 1.12.2, 1.13.0
>
>
> Sources currently store their registered readers into the snapshot. However,
> when downscaling, we have unmatched readers that we violate a couple of
> invariants.
> The solution is to not store registered readers - they are re-registered
> anyways on restart.
> To keep it backward compatible, the best option is to always store an empty
> set of readers while writing the snapshot and discard any recovered readers
> from the snapshot.
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