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https://issues.apache.org/jira/browse/FLINK-8257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16291536#comment-16291536
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Eron Wright commented on FLINK-8257:
-------------------------------------
Related: in some cases the parallelism must be equal to that of the preceding
operator.
e.g.
[DataStream::assignTimestampsAndWatermarks|https://github.com/apache/flink/blob/release-1.4.0/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/datastream/DataStream.java#L833]
> Unify the value checks for setParallelism()
> -------------------------------------------
>
> Key: FLINK-8257
> URL: https://issues.apache.org/jira/browse/FLINK-8257
> Project: Flink
> Issue Type: Improvement
> Components: Configuration
> Reporter: Xingcan Cui
>
> The {{setParallelism()}} method exist in many components from different
> levels. Some of the methods require the input value to be greater than {{1}}
> (e.g., {{StreamTransformation.setParallelism()}}), while some of also allow
> the value to be {{ExecutionConfig.PARALLELISM_DEFAULT}}, which is {{-1}} by
> default (e.g., {{DataSink.setParallelism()}}). We need to unify the value
> checks for these methods.
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