gaoyunhaii commented on a change in pull request #8: URL: https://github.com/apache/flink-ml/pull/8#discussion_r736452835
########## File path: flink-ml-iteration/src/main/java/org/apache/flink/iteration/progresstrack/OperatorEpochWatermarkTracker.java ########## @@ -0,0 +1,145 @@ +/* + * 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.iteration.progresstrack; + +import org.apache.flink.annotation.VisibleForTesting; + +import java.io.IOException; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.HashMap; +import java.util.List; +import java.util.Map; + +import static org.apache.flink.util.Preconditions.checkNotNull; +import static org.apache.flink.util.Preconditions.checkState; + +/** + * Tracks the epoch watermark from each input. Once the minimum epoch watermark changed, it would + * notify the listener. + */ +public class OperatorEpochWatermarkTracker { + + private final OperatorEpochWatermarkTrackerListener progressTrackerListener; + + private final List<InputStatus> inputStatuses; + + private final LowerBoundMaintainer allInputsLowerBound; + + public OperatorEpochWatermarkTracker( + int[] numberOfChannels, OperatorEpochWatermarkTrackerListener progressTrackerListener) { + checkState(numberOfChannels != null && numberOfChannels.length >= 1); + this.progressTrackerListener = checkNotNull(progressTrackerListener); + + this.inputStatuses = new ArrayList<>(numberOfChannels.length); + for (int numberOfChannel : numberOfChannels) { + inputStatuses.add(new InputStatus(numberOfChannel)); + } + + this.allInputsLowerBound = new LowerBoundMaintainer(numberOfChannels.length); + } + + public void onEpochWatermark(int inputIndex, String sender, int epochWatermark) + throws IOException { + InputStatus inputStatus = inputStatuses.get(inputIndex); + inputStatus.onUpdate(sender, epochWatermark); + + if (inputStatus.getInputLowerBound() > allInputsLowerBound.getValue(inputIndex)) { + int oldLowerBound = allInputsLowerBound.getLowerBound(); + allInputsLowerBound.updateValue(inputIndex, inputStatus.getInputLowerBound()); + if (allInputsLowerBound.getLowerBound() > oldLowerBound) { + progressTrackerListener.onEpochWatermarkIncrement( + allInputsLowerBound.getLowerBound()); + } + } + } + + @VisibleForTesting + int[] getNumberOfInputs() { Review comment: Currently we have split the tests into two parts: the `OperatorEpochWatermarkTrackerFactoryTest` tests creating the correct tracker based on the inputs of an operator, and `OperatorEpochWatermarkTrackerTest` tests the alignment algorithm under the different scenarios. I think perhaps we keep the two tests separate to avoid the `m * n` problem~? -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
