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https://issues.apache.org/jira/browse/FLINK-5338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15751151#comment-15751151
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David Anderson commented on FLINK-5338:
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When doing training, I like that DataStream::print() is parallel because it
provides a bit of transparency about what's going on, and enables some useful
discussion.
> Make printing sinks non-parallel
> --------------------------------
>
> Key: FLINK-5338
> URL: https://issues.apache.org/jira/browse/FLINK-5338
> Project: Flink
> Issue Type: Sub-task
> Components: Streaming
> Reporter: Stephan Ewen
> Priority: Minor
> Fix For: 2.0.0
>
>
> This is a suggestion, up for discussion.
> I suggest to make the {{DataStream::print()}} sink function inherently
> non-parallel, i.e., always executed in a single parallel sink.
> Since printing is only for toy setups anyways, and the performance is usually
> bound by the stdout stream, non-parallel prints should be sufficient.
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