Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/3561
Thanks for reminding, @uce ð Already had this on my list.
The only code that reads the DEFAULT_PARALLELISM from the config should be
in this piece of code in `CliFrontend`:
https://github.com/apache/flink/blob/master/flink-clients/src/main/java/org/apache/flink/client/CliFrontend.java#L250.
Here, we should check whether the user directly specified a parallelism and if
not read the one from the config. From there the parameter is already passed to
`ClusterClient.run()` where a a `ContextEnvironmentFactory` is being created.
In `ContextEnvironmentFactory.createExecutionEnvironment()` we would thus have
this parallelism.
The question now is whether to keep the
`lastEnvCreated.setParallelism(defaultParallelism)` or pass the default
parallelism to the `ContextEnvironment` so that the
`StreamExecutionEnvironment` can pick it up from there in the constructor. The
problem with calling `env.setParallelism()` is that the default parallelism
will be "forgotten" if the user calls `env.setParallelism(PARALLELISM_DEFAULT)`
where `ExecutionConfig.PARALLELISM_DEFAULT == -1`. If we manually store the
default parallelism in an extra field we would keep it. This seems to be the
nicer solution.
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