[jira] [Commented] (FLINK-3133) Introduce collect()/coun()/print() methods in DataStream API

["Stephan Ewen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15045160#comment-15045160 ] 

Stephan Ewen commented on FLINK-3133:
-------------------------------------

Fuzzy duplicate of [FLINK-2313].

> Introduce collect()/coun()/print() methods in DataStream API
> ------------------------------------------------------------
>
>                 Key: FLINK-3133
>                 URL: https://issues.apache.org/jira/browse/FLINK-3133
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API, Streaming
>    Affects Versions: 0.10.0, 1.0.0, 0.10.1
>            Reporter: Maximilian Michels
>             Fix For: 1.0.0
>
>
> The DataSet API's methods {{collect()}}, {{count()}}, and {{print()}} should be mirrored to the DataStream API. 
> The semantics of the calls are different. We need to be able to sample parts of a stream, e.g. by supplying a time period in the arguments to the methods. Collect/count/print should be lazily evaluated. Users should use the {{StreamEnvironment}} to retrieve the results.
> {code:java}
> StreamExecutionEnvironment env = StramEnvironment.getStreamExecutionEnvironment();
> DataStream<Integer> printSink = env.addSource(..).print();
> ResultQueryable queryObject = env.executeWithResultQueryable();
> List<Integer> sampled = queryObject.retrieve(printSink, Time.seconds(5));
> {code}



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