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[This FLIP proposal is a joint work between Zhanghao Chen and @Dewei Dewei Su .]

Motivation

Currently, Flink Table/SQL jobs do not expose fine-grained control of operator parallelism to users. FLIP-146 brings us support for setting parallelism for sinks, but except for that, one can only set a default global parallelism and all other operators share the same parallelism. However, in many cases, setting parallelism for sources individually is preferable:

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