pvary commented on code in PR #7366: URL: https://github.com/apache/iceberg/pull/7366#discussion_r1173313922
########## flink/v1.16/flink/src/main/java/org/apache/iceberg/flink/source/assigner/EventTimeAlignedAssigner.java: ########## @@ -0,0 +1,301 @@ +/* + * + * * 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.iceberg.flink.source.assigner; + +import java.io.Serializable; +import java.time.Duration; +import java.util.Collection; +import java.util.Collections; +import java.util.Comparator; +import java.util.Set; +import java.util.TreeSet; +import java.util.concurrent.CompletableFuture; +import java.util.stream.Collectors; +import javax.annotation.Nullable; +import javax.annotation.concurrent.NotThreadSafe; +import org.apache.flink.api.common.eventtime.TimestampAssigner; +import org.apache.iceberg.flink.source.split.IcebergSourceSplit; +import org.apache.iceberg.flink.source.split.IcebergSourceSplitState; +import org.apache.iceberg.flink.source.split.IcebergSourceSplitStatus; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import static org.apache.flink.calcite.shaded.com.google.common.collect.Iterables.getFirst; + +public class EventTimeAlignedAssigner implements SplitAssigner, WatermarkTracker.Listener { + private static final Logger log = LoggerFactory.getLogger(EventTimeAlignedAssigner.class); + private final WatermarkTracker watermarkTracker; + private final State state; + private final TimestampAssigner<IcebergSourceSplit> timestampAssigner; + private final FutureNotifier futureNotifier; + private final Options options; + + // flag that informs the state that there are no more splits to be added by the Enumerator + private volatile boolean noMoreSplits; + + public EventTimeAlignedAssigner( + WatermarkTracker watermarkTracker, + TimestampAssigner<IcebergSourceSplit> timestampAssigner, + Options options) { + this.watermarkTracker = watermarkTracker; + this.state = new State(watermarkTracker, timestampAssigner); + this.options = options; + this.timestampAssigner = timestampAssigner; + this.futureNotifier = new FutureNotifier(); + this.watermarkTracker.onInitialization(); + } + + @Override + public void start() { + watermarkTracker.addListener(this); + } + + @Override + public void close() { + watermarkTracker.removeListener(this); + notifyListener(); + } + + @Override + public GetSplitResult getNext(@Nullable String hostname) { + GetSplitResult result = getNextInternal(); + if (result.status() == GetSplitResult.Status.AVAILABLE) { + state.onSplitAssigned(result.split()); + } + return result; + } + + @Override + public void onDiscoveredSplits(Collection<IcebergSourceSplit> splits) { + state.onDiscoveredSplits(splits); + } + + @Override + public void onUnassignedSplits(Collection<IcebergSourceSplit> splits) { + state.onUnassignedSplits(splits); + } + + @Override + public void onCompletedSplits(Collection<String> completedSplitIds) { + state.onCompletedSplits(completedSplitIds); + if (!completedSplitIds.isEmpty() && isTerminal()) { + updateListenersOnTerminalCondition(); + } + } + + @Override + public void onNoMoreSplits() { + noMoreSplits = true; + if (isTerminal()) { + updateListenersOnTerminalCondition(); + } + } + + private boolean isWithinBounds(IcebergSourceSplit split, Long watermark) { + if (watermark == null) { + return true; + } + + long splitTs = timestampAssigner.extractTimestamp(split, -1); + if (splitTs < watermark) { + log.warn("splitTs at {} is lower than the watermark {}", splitTs, watermark); + } + + return Math.max(splitTs - watermark, 0L) <= options.getThresholdInMs(); + } + + private GetSplitResult getNextInternal() { + if (state.getUnassignedSplits().isEmpty()) { + log.info("looks like there are no splits to be assigned"); + return GetSplitResult.unavailable(); + } + + try { + Long watermark = watermarkTracker.getGlobalWatermark(); + IcebergSourceSplit pendingSplit = getFirst(state.getUnassignedSplits(), null); + if (!isWithinBounds(pendingSplit, watermark)) { + log.info( + "split {} is not within bounds {} {}", + pendingSplit, + watermark, + timestampAssigner.extractTimestamp(pendingSplit, -1)); + return GetSplitResult.constrained(); + } + + return GetSplitResult.forSplit(pendingSplit); + } catch (Exception e) { + log.error("Couldn't obtain the watermark from the tracker", e); Review Comment: Is this the 9nly error weca have here? -- This is an automated message from the Apache Git Service. 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