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https://issues.apache.org/jira/browse/FLINK-1486?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14509016#comment-14509016
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ASF GitHub Bot commented on FLINK-1486:
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Github user StephanEwen commented on the pull request:
https://github.com/apache/flink/pull/372#issuecomment-95580456
From what I have seen, most people expect print() to actually go to the
client.
It would be a break of backwards compatibility, agreed. Maybe one of the
few that are necessary.
> Add a string to the print method to identify output
> ---------------------------------------------------
>
> Key: FLINK-1486
> URL: https://issues.apache.org/jira/browse/FLINK-1486
> Project: Flink
> Issue Type: Improvement
> Components: Local Runtime
> Reporter: Maximilian Michels
> Assignee: Maximilian Michels
> Priority: Minor
> Labels: usability
> Fix For: 0.9
>
>
> The output of the {{print}} method of {[DataSet}} is mainly used for debug
> purposes. Currently, it is difficult to identify the output.
> I would suggest to add another {{print(String str)}} method which allows the
> user to supply a String to identify the output. This could be a prefix before
> the actual output or a format string (which might be an overkill).
> {code}
> DataSet data = env.fromElements(1,2,3,4,5);
> {code}
> For example, {{data.print("MyDataSet: ")}} would output print
> {noformat}
> MyDataSet: 1
> MyDataSet: 2
> ...
> {noformat}
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