TisonKun commented on issue #6353: [FLINK-9875][runtime] Add concurrent creation of execution job vertex URL: https://github.com/apache/flink/pull/6353#issuecomment-409471476 @StephanEwen agree with "design before implementation". However, the interface for the creation of input splits is definitely `InputSplitSource#createInputSplits`, whose implementations varies from `FileInputFormat` to `JDBCInputFormat` and so on. Since we need to decide how to create input split in a specific input source, the parallelize logic is various inside the implementation, so implement the parallelize logic case by case if possible and necessary. I still comment here about this because it is clear to me that the interface for the creation of input splits is definitely `InputSplitSource#createInputSplits` existing.
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