Sxnan commented on code in PR #24422: URL: https://github.com/apache/flink/pull/24422#discussion_r1546005963
########## flink-datastream/src/main/java/org/apache/flink/datastream/impl/stream/KeyedPartitionStreamImpl.java: ########## @@ -0,0 +1,389 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.flink.datastream.impl.stream; + +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.dag.Transformation; +import org.apache.flink.api.java.functions.KeySelector; +import org.apache.flink.api.java.tuple.Tuple2; +import org.apache.flink.api.java.typeutils.TypeExtractor; +import org.apache.flink.datastream.api.function.OneInputStreamProcessFunction; +import org.apache.flink.datastream.api.function.TwoInputBroadcastStreamProcessFunction; +import org.apache.flink.datastream.api.function.TwoInputNonBroadcastStreamProcessFunction; +import org.apache.flink.datastream.api.function.TwoOutputStreamProcessFunction; +import org.apache.flink.datastream.api.stream.BroadcastStream; +import org.apache.flink.datastream.api.stream.GlobalStream; +import org.apache.flink.datastream.api.stream.KeyedPartitionStream; +import org.apache.flink.datastream.api.stream.NonKeyedPartitionStream; +import org.apache.flink.datastream.api.stream.NonKeyedPartitionStream.TwoNonKeyedPartitionStreams; +import org.apache.flink.datastream.impl.operators.KeyedProcessOperator; +import org.apache.flink.datastream.impl.operators.KeyedTwoInputBroadcastProcessOperator; +import org.apache.flink.datastream.impl.operators.KeyedTwoInputNonBroadcastProcessOperator; +import org.apache.flink.datastream.impl.operators.KeyedTwoOutputProcessOperator; +import org.apache.flink.datastream.impl.stream.NonKeyedPartitionStreamImpl.TwoNonKeyedPartitionStreamsImpl; +import org.apache.flink.datastream.impl.utils.StreamUtils; +import org.apache.flink.streaming.api.graph.StreamGraphGenerator; +import org.apache.flink.streaming.api.transformations.PartitionTransformation; +import org.apache.flink.streaming.runtime.partitioner.GlobalPartitioner; +import org.apache.flink.streaming.runtime.partitioner.KeyGroupStreamPartitioner; +import org.apache.flink.streaming.runtime.partitioner.ShufflePartitioner; +import org.apache.flink.util.OutputTag; + +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** The implementation of {@link KeyedPartitionStream}. */ +public class KeyedPartitionStreamImpl<K, V> extends AbstractDataStream<V> + implements KeyedPartitionStream<K, V> { + + /** + * The key selector that can get the key by which the stream if partitioned from the elements. + */ + private final KeySelector<V, K> keySelector; + + /** The type of the key by which the stream is partitioned. */ + private final TypeInformation<K> keyType; + + public KeyedPartitionStreamImpl( + AbstractDataStream<V> dataStream, KeySelector<V, K> keySelector) { + this( + dataStream, + keySelector, + TypeExtractor.getKeySelectorTypes(keySelector, dataStream.getType())); + } + + public KeyedPartitionStreamImpl( + AbstractDataStream<V> dataStream, + KeySelector<V, K> keySelector, + TypeInformation<K> keyType) { + this( + dataStream, + new PartitionTransformation<>( + dataStream.getTransformation(), + new KeyGroupStreamPartitioner<>( + keySelector, + StreamGraphGenerator.DEFAULT_LOWER_BOUND_MAX_PARALLELISM)), + keySelector, + keyType); + } + + /** + * This can construct a keyed stream directly without partitionTransformation to avoid shuffle. + */ + public KeyedPartitionStreamImpl( + AbstractDataStream<V> dataStream, + Transformation<V> partitionTransformation, + KeySelector<V, K> keySelector, + TypeInformation<K> keyType) { + super(dataStream.getEnvironment(), partitionTransformation); + this.keySelector = keySelector; + this.keyType = keyType; + } + + @Override + public <OUT> NonKeyedPartitionStream<OUT> process( + OneInputStreamProcessFunction<V, OUT> processFunction) { + TypeInformation<OUT> outType; + outType = StreamUtils.getOutputTypeForOneInputProcessFunction(processFunction, getType()); + + KeyedProcessOperator<K, V, OUT> operator = new KeyedProcessOperator<>(processFunction); + Transformation<OUT> transform = + StreamUtils.getOneInputKeyedTransformation( + "KeyedProcess", this, outType, operator, keySelector, keyType); + environment.addOperator(transform); + return new NonKeyedPartitionStreamImpl<>(environment, transform); + } + + @Override + public <OUT> KeyedPartitionStream<K, OUT> process( + OneInputStreamProcessFunction<V, OUT> processFunction, + KeySelector<OUT, K> newKeySelector) { + TypeInformation<OUT> outType = + StreamUtils.getOutputTypeForOneInputProcessFunction(processFunction, getType()); + KeyedProcessOperator<K, V, OUT> operator = + new KeyedProcessOperator<>(processFunction, checkNotNull(newKeySelector)); + Transformation<OUT> transform = + StreamUtils.getOneInputKeyedTransformation( + "KeyedProcess", this, outType, operator, keySelector, keyType); + NonKeyedPartitionStreamImpl<OUT> outputStream = + new NonKeyedPartitionStreamImpl<>(environment, transform); + environment.addOperator(transform); + // Construct a keyed stream directly without partitionTransformation to avoid shuffle. + return new KeyedPartitionStreamImpl<>( + outputStream, + transform, + newKeySelector, + TypeExtractor.getKeySelectorTypes(newKeySelector, outputStream.getType())); + } + + @Override + public <OUT1, OUT2> TwoKeyedPartitionStreams<K, OUT1, OUT2> process( + TwoOutputStreamProcessFunction<V, OUT1, OUT2> processFunction, + KeySelector<OUT1, K> keySelector1, + KeySelector<OUT2, K> keySelector2) { + Tuple2<TypeInformation<OUT1>, TypeInformation<OUT2>> twoOutputType = + StreamUtils.getOutputTypesForTwoOutputProcessFunction(processFunction, getType()); + TypeInformation<OUT1> firstOutputType = twoOutputType.f0; + TypeInformation<OUT2> secondTOutputType = twoOutputType.f1; + OutputTag<OUT2> secondOutputTag = new OutputTag<>("Second-Output", secondTOutputType); Review Comment: Thanks for the explanation. -- This is an automated message from the Apache Git Service. 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