WencongLiu commented on code in PR #24398: URL: https://github.com/apache/flink/pull/24398#discussion_r1521322872
########## flink-streaming-java/src/main/java/org/apache/flink/streaming/api/operators/MapPartitionOperator.java: ########## @@ -0,0 +1,77 @@ +/* + * 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.streaming.api.operators; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.api.common.functions.MapPartitionFunction; +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; +import org.apache.flink.util.ExceptionUtils; + +/** + * The {@link MapPartitionOperator} is used to process all records in each partition on non-keyed + * stream. Each partition contains all records of a subtask. + */ +@Internal +public class MapPartitionOperator<IN, OUT> + extends AbstractUdfStreamOperator<OUT, MapPartitionFunction<IN, OUT>> + implements OneInputStreamOperator<IN, OUT>, BoundedOneInput { + + private final MapPartitionFunction<IN, OUT> function; + + private MapPartitionIterator<IN> iterator; + + public MapPartitionOperator(MapPartitionFunction<IN, OUT> function) { + super(function); + this.function = function; + // This operator is set to be non-chained as it doesn't use task main thread to write + // records to output, which may introduce risks to downstream chained operators. + this.chainingStrategy = ChainingStrategy.NEVER; Review Comment: The `mapPartition` API is an operator that is suitable for batch job scenarios, so setting it to `ChargingStrategy.NEVER` allows the operator to be separated from other operators, reducing the cost of fault tolerance. Therefore, I think this change is also reasonable. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@flink.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
