[jira] [Commented] (FLINK-19508) Add collect() operation on DataStream

["Timo Walther (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-19508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17208567#comment-17208567 ] 

Timo Walther commented on FLINK-19508:
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+1 but we should make it clear that this method performs an execution and `env.execute()` would throw an exception. Thus, I would propose to name it `DataStream.executeAndCollect()`, `DataStream.executeAndPrint()` or similar.

> Add collect() operation on DataStream
> -------------------------------------
>
>                 Key: FLINK-19508
>                 URL: https://issues.apache.org/jira/browse/FLINK-19508
>             Project: Flink
>          Issue Type: Improvement
>          Components: API / DataStream
>            Reporter: Aljoscha Krettek
>            Priority: Major
>
> With the recent changes/additions to {{DataStreamUtils.collect()}} that make it more robust by using the regular REST client to fetch results from operators it might make sense to add a {{collect()}} operation right on {{DataStream}}.
> This operation is still not meant for big data volumes but I think it can be useful for debugging and fetching small amounts of messages to the client. When we do this, we can also think about changing {{print()}} to print on the client instead of to the {{TaskManager}} stdout. I think the current behaviour of this operation is mostly confusing for users.



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