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https://issues.apache.org/jira/browse/FLINK-3133?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Maximilian Michels updated FLINK-3133:
--------------------------------------
Description:
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}
was:
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}
> 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}
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