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  1. User-defined source parallelism. Source parallelism can be configured via global parallelism, or can be assigned by DataStream, Table/SQL(FLIP-367).
  2. Connector static parallelism inference (e.g. hive source).
  3. Dynamic parallelism inference. For batch jobs which use adaptive batch scheduler(FLIP-187), the current implementation will use a global default source parallelism as the inferred parallelism for sources.

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