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https://issues.apache.org/jira/browse/FLINK-20337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17238729#comment-17238729
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Aljoscha Krettek commented on FLINK-20337:
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It's not incomplete, it's just that existing users of the {{StreamingFileSink}}
cannot migrate. This doesn't have to be a blocker. We can add it whenever it's
ready and ship it in a point release.
> Make migrate `StreamingFileSink` to `FileSink` possible
> -------------------------------------------------------
>
> Key: FLINK-20337
> URL: https://issues.apache.org/jira/browse/FLINK-20337
> Project: Flink
> Issue Type: Improvement
> Components: API / DataStream
> Affects Versions: 1.12.0
> Reporter: Guowei Ma
> Assignee: Guowei Ma
> Priority: Blocker
> Fix For: 1.12.0
>
>
> Flink-1.12 introduces the `FileSink` in FLINK-19510, which can guarantee the
> exactly once semantics both in the streaming and batch execution mode. We
> need to provide a way for the user who uses `StreamingFileSink` to migrate
> from `StreamingFileSink` to `FileSink`.
> For this purpose we propose to let the new sink writer operator could load
> the previous StreamingFileSink's state and then the `SinkWriter` could have
> the opertunity to handle the old state.
>
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