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https://issues.apache.org/jira/browse/FLINK-19338?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arvid Heise resolved FLINK-19338.
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Fix Version/s: 1.12.0
Resolution: Fixed
> New source interface cannot unregister unregistered source
> ----------------------------------------------------------
>
> Key: FLINK-19338
> URL: https://issues.apache.org/jira/browse/FLINK-19338
> Project: Flink
> Issue Type: Bug
> Components: Connectors / Common
> Affects Versions: 1.12.0, 1.11.2
> Reporter: Arvid Heise
> Assignee: Arvid Heise
> Priority: Major
> Fix For: 1.12.0
>
>
> When a source subtask fails before the respective reader is registered in
> {{SourceCoordinatorContext}}, unregistering fails as it explicitly verifies
> that the reader has been registered before.
> The solution is to drop the assumption that all readers are registered when
> cleaning up subtasks.
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