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https://issues.apache.org/jira/browse/FLINK-2999?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15000177#comment-15000177
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Stephan Ewen commented on FLINK-2999:
-------------------------------------
I need this as well!
> Support connected keyed streams
> -------------------------------
>
> Key: FLINK-2999
> URL: https://issues.apache.org/jira/browse/FLINK-2999
> Project: Flink
> Issue Type: Improvement
> Components: Streaming
> Affects Versions: 1.0
> Reporter: Fabian Hueske
> Assignee: Stephan Ewen
>
> It would be nice to add support for connected keyed streams to enable
> key-partitioned state in Co*Functions.
> This could be done by simply connecting two keyed Streams or adding a new
> method to connect and key two streams as one operation.
> {code}
> DataStream<X> s1 = ...
> DataStream<Y> s2 = ...
> // alternative 1
> s1
> .keyBy(0)
> .connect(s2.keyBy(1))
> .map(new KeyedCoMap());
> // alternative 2
> s1
> .connectByKey(s2, 0, 1)
> .map(new KeyedCoMap());
> public class KeyedCoMap implements RichCoMapFunction<X,Y,Z> {
>
> OperatorState<A> s;
> public void open() {
> s = getRuntimeContext().getKeyValueState("abc", A.class, new A());
> }
> // ...
> }
> {code}
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