CoGroupedStreams

org.apache.flinkx.api.CoGroupedStreams

@Public

class CoGroupedStreams[T1, T2](input1: DataStream[T1], input2: DataStream[T2])

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())
}

Attributes

Graph
Supertypes: class Object

trait Matchable

class Any

Members list

Type members

Classlikes

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.

Type parameters

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

Attributes

Supertypes: class Object

trait Matchable

class Any

Value members

Concrete methods

Specifies a KeySelector for elements from the first input.

Attributes

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