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Alexander Shoshin commented on FLINK-3133: ------------------------------------------ Hi ) Thanks, Maximilian. I think that now I understand this issue. One more question: when we call {{jobClient.sampleStream(..)}}, should we immediatly recieve the result of the last 5 seconds (then what if the job is just started and we have not yet have any results?) or we should block execution for 5 seconds till the result will be accumulated? And I see that {{JobClient}} is going to be implemented in FLINK-4272. Should we wait till it will be merged? > Introduce collect()/count()/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 > Assignee: Alexander Shoshin > 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. > Users should use the {{JobClient}} to retrieve the results. > {code:java} > StreamExecutionEnvironment env = > StramEnvironment.getStreamExecutionEnvironment(); > DataStream<DataType> streamData = env.addSource(..).map(..); > JobClient jobClient = env.executeWithControl(); > Iterable<DataType> sampled = jobClient.sampleStream(streamData, > Time.seconds(5)); > {code} -- This message was sent by Atlassian JIRA (v6.3.4#6332)