Thank you, Paul.

The answer is so clear and helpful. But I'm still wondering what is the
purpose of the sink.partition-commit.success-file.name
<https://ci.apache.org/projects/flink/flink-docs-release-1.13/docs/connectors/table/filesystem/#sink-partition-commit-success-file-name>
option
if the sink files must be named in that specific way.

On Fri, Nov 5, 2021 at 3:23 PM Fabian Paul <fabianp...@ververica.com> wrote:

> Hi,
>
> Currently this is expected because the FileSink is built to support
> running with higher parallelism. Therefore it needs to periodically write
> files. The
> respective file names always have a descriptor that the File Sink knows
> which files have already been written. You can read more about the FileSink
> here [1].
>
> Best,
> Fabian
>
> [1]
> https://ci.apache.org/projects/flink/flink-docs-master/docs/connectors/datastream/file_sink/



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