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[FLINK-8997] Added sliding window aggregation to datastream test job
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192 changes: 192 additions & 0 deletions
192
...llround-test/src/main/java/org/apache/flink/streaming/tests/SlidingWindowCheckMapper.java
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| /* | ||
| * 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:https://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. | ||
| */ | ||
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| package org.apache.flink.streaming.tests; | ||
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| import org.apache.flink.api.common.functions.RichFlatMapFunction; | ||
| import org.apache.flink.api.common.state.ValueState; | ||
| import org.apache.flink.api.common.state.ValueStateDescriptor; | ||
| import org.apache.flink.api.common.typeinfo.BasicTypeInfo; | ||
| import org.apache.flink.api.common.typeinfo.TypeInformation; | ||
| import org.apache.flink.api.java.tuple.Tuple2; | ||
| import org.apache.flink.api.java.typeutils.ListTypeInfo; | ||
| import org.apache.flink.api.java.typeutils.TupleTypeInfo; | ||
| import org.apache.flink.configuration.Configuration; | ||
| import org.apache.flink.util.Collector; | ||
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| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.Comparator; | ||
| import java.util.List; | ||
| import java.util.Optional; | ||
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| /** | ||
| * This mapper validates sliding event time window. It checks each event belongs to appropriate number of consecutive | ||
| * windows. | ||
| */ | ||
| public class SlidingWindowCheckMapper extends RichFlatMapFunction<Tuple2<Integer, List<Event>>, String> { | ||
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| private static final long serialVersionUID = -744070793650644485L; | ||
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| /** This value state tracks previously seen events with the number of windows they appeared in. */ | ||
| private transient ValueState<List<Tuple2<Event, Integer>>> eventsSeenSoFar; | ||
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| private transient ValueState<Long> lastSequenceNumber; | ||
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| private final int slideFactor; | ||
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| SlidingWindowCheckMapper(int slideFactor) { | ||
| this.slideFactor = slideFactor; | ||
| } | ||
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| @Override | ||
| public void open(Configuration parameters) { | ||
| ValueStateDescriptor<List<Tuple2<Event, Integer>>> previousWindowDescriptor = | ||
| new ValueStateDescriptor<>("eventsSeenSoFar", | ||
| new ListTypeInfo<>(new TupleTypeInfo<>(TypeInformation.of(Event.class), BasicTypeInfo.INT_TYPE_INFO))); | ||
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| eventsSeenSoFar = getRuntimeContext().getState(previousWindowDescriptor); | ||
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| ValueStateDescriptor<Long> lastSequenceNumberDescriptor = | ||
| new ValueStateDescriptor<>("lastSequenceNumber", BasicTypeInfo.LONG_TYPE_INFO); | ||
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| lastSequenceNumber = getRuntimeContext().getState(lastSequenceNumberDescriptor); | ||
| } | ||
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| @Override | ||
| public void flatMap(Tuple2<Integer, List<Event>> value, Collector<String> out) throws Exception { | ||
| List<Tuple2<Event, Integer>> previousWindowValues = Optional.ofNullable(eventsSeenSoFar.value()).orElseGet( | ||
| Collections::emptyList); | ||
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| List<Event> newValues = value.f1; | ||
| Optional<Event> lastEventInWindow = verifyWindowContiguity(newValues, out); | ||
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| Long lastSequenceNumberSeenSoFar = lastSequenceNumber.value(); | ||
| List<Tuple2<Event, Integer>> newWindows = | ||
| verifyPreviousOccurences(previousWindowValues, newValues, lastSequenceNumberSeenSoFar, out); | ||
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| if (lastEventInWindow.isPresent()) { | ||
| updateLastSeenSequenceNumber(lastEventInWindow.get(), lastSequenceNumberSeenSoFar, out); | ||
| } | ||
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| eventsSeenSoFar.update(newWindows); | ||
| } | ||
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| private void updateLastSeenSequenceNumber( | ||
| Event lastEventInWindow, | ||
| Long lastSequenceNumberSeenSoFar, | ||
| Collector<String> out) throws IOException { | ||
| long lastSequenceNumberInWindow = lastEventInWindow.getSequenceNumber(); | ||
| if (lastSequenceNumberSeenSoFar == null || lastSequenceNumberInWindow > lastSequenceNumberSeenSoFar) { | ||
| lastSequenceNumber.update(lastSequenceNumberInWindow); | ||
| } else if (lastSequenceNumberInWindow < lastSequenceNumberSeenSoFar) { | ||
| failWithSequenceNumberDecreased(lastEventInWindow, lastSequenceNumberSeenSoFar, out); | ||
| } | ||
| } | ||
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| private void failWithSequenceNumberDecreased( | ||
| Event lastEventInWindow, | ||
| Long lastSequenceNumberSeenSoFar, | ||
| Collector<String> out) { | ||
| out.collect(String.format("Last event in current window (%s) has sequence number lower than seen so far (%d)", | ||
| lastEventInWindow, | ||
| lastSequenceNumberSeenSoFar)); | ||
| } | ||
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| /** | ||
| * Verifies if all values from previous windows appear in the new one. Returns union of all events seen so far that | ||
| * were not seen <b>slideFactor</b> number of times yet. | ||
| */ | ||
| private List<Tuple2<Event, Integer>> verifyPreviousOccurences( | ||
| List<Tuple2<Event, Integer>> previousWindowValues, | ||
| List<Event> newValues, | ||
| Long lastSequenceNumberSeenSoFar, | ||
| Collector<String> out) { | ||
| List<Tuple2<Event, Integer>> newEventsSeenSoFar = new ArrayList<>(); | ||
| List<Event> seenEvents = new ArrayList<>(); | ||
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| for (Tuple2<Event, Integer> windowValue : previousWindowValues) { | ||
| if (!newValues.contains(windowValue.f0)) { | ||
| failWithEventNotSeenAlertMessage(windowValue, newValues, out); | ||
| } else { | ||
| seenEvents.add(windowValue.f0); | ||
| preserveOrDiscardIfSeenSlideFactorTimes(newEventsSeenSoFar, windowValue); | ||
| } | ||
| } | ||
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| addNotSeenValues(newEventsSeenSoFar, newValues, seenEvents, lastSequenceNumberSeenSoFar, out); | ||
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| return newEventsSeenSoFar; | ||
| } | ||
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| private void addNotSeenValues( | ||
| List<Tuple2<Event, Integer>> newEventsSeenSoFar, | ||
| List<Event> newValues, | ||
| List<Event> seenValues, | ||
| Long lastSequenceNumberSeenSoFar, | ||
| Collector<String> out) { | ||
| newValues.stream() | ||
| .filter(e -> !seenValues.contains(e)) | ||
| .forEach(e -> { | ||
| if (lastSequenceNumberSeenSoFar == null || e.getSequenceNumber() > lastSequenceNumberSeenSoFar) { | ||
| newEventsSeenSoFar.add(Tuple2.of(e, 1)); | ||
| } else { | ||
| failWithEventSeenTooManyTimesMessage(e, out); | ||
| } | ||
| }); | ||
| } | ||
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| private void failWithEventSeenTooManyTimesMessage(Event e, Collector<String> out) { | ||
| out.collect(String.format("Alert: event %s seen more than %d times", e, slideFactor)); | ||
| } | ||
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| private void preserveOrDiscardIfSeenSlideFactorTimes( | ||
| List<Tuple2<Event, Integer>> newEvenstSeenSoFar, | ||
| Tuple2<Event, Integer> windowValue) { | ||
| int timesSeen = windowValue.f1 + 1; | ||
| if (timesSeen != slideFactor) { | ||
| newEvenstSeenSoFar.add(Tuple2.of(windowValue.f0, timesSeen)); | ||
| } | ||
| } | ||
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| private void failWithEventNotSeenAlertMessage( | ||
| Tuple2<Event, Integer> previousWindowValue, | ||
| List<Event> currentWindowValues, | ||
| Collector<String> out) { | ||
| out.collect(String.format( | ||
| "Alert: event %s did not belong to %d consecutive windows. " + | ||
| "Event seen so far %d times.Current window: %s", | ||
| previousWindowValue.f0, | ||
| slideFactor, | ||
| previousWindowValue.f1, | ||
| currentWindowValues)); | ||
| } | ||
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| private Optional<Event> verifyWindowContiguity(List<Event> newValues, Collector<String> out) { | ||
| return newValues.stream() | ||
| .sorted(Comparator.comparingLong(Event::getSequenceNumber)) | ||
| .reduce((event, event2) -> { | ||
| if (event2.getSequenceNumber() - 1 != event.getSequenceNumber()) { | ||
| out.collect("Alert: events in window out ouf order!"); | ||
| } | ||
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| return event2; | ||
| }); | ||
| } | ||
| } |