[jira] [Created] (FLINK-21844) Do not auto-configure maxParallelism when setting "scheduler-mode: reactive"

["Konstantin Knauf (Jira)" <ji...@apache.org>]

Konstantin Knauf created FLINK-21844:
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             Summary: Do not auto-configure maxParallelism when setting "scheduler-mode: reactive"
                 Key: FLINK-21844
                 URL: https://issues.apache.org/jira/browse/FLINK-21844
             Project: Flink
          Issue Type: Sub-task
          Components: Runtime / Coordination
            Reporter: Konstantin Knauf


I believe we should not automatically change the maxParallelism when the 
"scheduler-mode" is set to "reactive", because:

* it magically breaks savepoint compatibility, when you switch between default and reactive scheduler mode
* the maximum parallelism is an orthogonal concern that in my opinion should not be mixed with the scheduler mode. The reactive scheduler should respect the maxParallelism, but it should not set change its default value.
 



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