Class

org.apache.flink.streaming.api.scala

CoGroupedStreams

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class CoGroupedStreams[T1, T2] extends AnyRef

CoGroupedStreams represents two DataStreams that have been co-grouped. A streaming co-group operation is evaluated over elements in a window.

To finalize the co-group operation you also need to specify a KeySelector for both the first and second input and a WindowAssigner

Note: Right now, the groups are being built in memory so you need to ensure that they don't get too big. Otherwise the JVM might crash.

Example:

val one: DataStream[(String, Int)]  = ...
val two: DataStream[(String, Int)] = ...

val result = one.coGroup(two)
    .where(new MyFirstKeySelector())
    .equalTo(new MyFirstKeySelector())
    .window(TumblingEventTimeWindows.of(Time.of(5, TimeUnit.SECONDS)))
    .apply(new MyCoGroupFunction())
}
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Instance Constructors

  1. new CoGroupedStreams(input1: DataStream[T1], input2: DataStream[T2])

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Type Members

  1. class Where[KEY] extends AnyRef

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    A co-group operation that has KeySelectors defined for the first input.

    A co-group operation that has KeySelectors defined for the first input.

    You need to specify a KeySelector for the second input using equalTo() before you can proceed with specifying a WindowAssigner using EqualTo.window().

    KEY

    Type of the key. This must be the same for both inputs

Value Members

  1. final def !=(arg0: Any): Boolean

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  2. final def ##(): Int

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  3. final def ==(arg0: Any): Boolean

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  4. final def asInstanceOf[T0]: T0

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  5. def clone(): AnyRef

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  6. final def eq(arg0: AnyRef): Boolean

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  7. def equals(arg0: Any): Boolean

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  8. def finalize(): Unit

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  9. final def getClass(): Class[_]

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  10. def hashCode(): Int

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  11. final def isInstanceOf[T0]: Boolean

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  12. final def ne(arg0: AnyRef): Boolean

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  13. final def notify(): Unit

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  14. final def notifyAll(): Unit

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  15. final def synchronized[T0](arg0: ⇒ T0): T0

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  16. def toString(): String

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  17. final def wait(): Unit

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  18. final def wait(arg0: Long, arg1: Int): Unit

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  19. final def wait(arg0: Long): Unit

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  20. def where[KEY](keySelector: (T1) ⇒ KEY)(implicit arg0: TypeInformation[KEY]): Where[KEY]

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    Specifies a KeySelector for elements from the first input.

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