XuPingyong created FLINK-12816:
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Summary: set maxParallelism to 1 when DataStreamSource is not
isParallel
Key: FLINK-12816
URL: https://issues.apache.org/jira/browse/FLINK-12816
Project: Flink
Issue Type: Task
Components: API / DataStream
Affects Versions: 1.8.0
Reporter: XuPingyong
Fix For: 1.9.0
Now when DataStreamSource is not parallel, only parallelism is set to 1,
maxParallelism should be also set to 1.
As when SingleOutputStreamOperator is not parallel, it set not only
parallelism but also maxParallelism to 1
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