io.ray.streaming.api.stream

类 KeyDataStream<K,T>

java.lang.Object

io.ray.streaming.api.stream.Stream<DataStream<T>,T>

io.ray.streaming.api.stream.DataStream<T>

io.ray.streaming.api.stream.KeyDataStream<K,T>

类型参数:

K - Type of the key.

T - Type of the data.

所有已实现的接口:

Serializable

public class KeyDataStream<K,T>
extends DataStream<T>

Represents a DataStream returned by a key-by operation.

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
KeyDataStream(DataStream<T> input, StreamOperator streamOperator)
KeyDataStream(PythonDataStream referencedStream) Create a java stream that reference passed python stream.

方法概要

限定符和类型	方法和说明
<A,O> DataStream<O>	aggregate(AggregateFunction<T,A,O> aggregateFunction) Apply an aggregate Function to this stream.
PythonKeyDataStream	asPythonStream() Convert this stream as a python stream.
DataStream<T>	reduce(ReduceFunction reduceFunction) Apply a reduce function to this stream.

从类继承的方法 io.ray.streaming.api.stream.DataStream

broadcast, filter, flatMap, getLanguage, join, keyBy, map, partitionBy, process, sink, union, union

从类继承的方法 io.ray.streaming.api.stream.Stream

disableChain, forward, getConfig, getId, getInputStream, getOperator, getOriginalStream, getParallelism, getPartition, getStreamingContext, isProxyStream, setParallelism, setPartition, withChainStrategy, withConfig, withConfig

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

KeyDataStream

public KeyDataStream(DataStream<T> input,
                     StreamOperator streamOperator)

KeyDataStream

public KeyDataStream(PythonDataStream referencedStream)

Create a java stream that reference passed python stream. Changes in new stream will be reflected in referenced stream and vice versa

方法详细资料

reduce

public DataStream<T> reduce(ReduceFunction reduceFunction)

Apply a reduce function to this stream.

参数:

reduceFunction - The reduce function.

返回:

A new DataStream.

aggregate

public <A,O> DataStream<O> aggregate(AggregateFunction<T,A,O> aggregateFunction)

Apply an aggregate Function to this stream.

类型参数:

A - The type of aggregated intermediate data.

O - The type of result data.

参数:

aggregateFunction - The aggregate function

返回:

A new DataStream.

asPythonStream

public PythonKeyDataStream asPythonStream()

Convert this stream as a python stream. The converted stream and this stream are the same logical stream, which has same stream id. Changes in converted stream will be reflected in this stream and vice versa.

覆盖:

asPythonStream 在类中 DataStream<T>