rdblue commented on a change in pull request #4329: URL: https://github.com/apache/iceberg/pull/4329#discussion_r830190401
########## File path: flink/v1.14/flink/src/main/java/org/apache/iceberg/flink/source/enumerator/ContinuousSplitPlannerImpl.java ########## @@ -0,0 +1,170 @@ +/* + * 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.enumerator; + +import java.util.Collections; +import java.util.List; +import java.util.Optional; +import java.util.concurrent.ExecutorService; +import org.apache.flink.annotation.Internal; +import org.apache.flink.annotation.VisibleForTesting; +import org.apache.iceberg.HistoryEntry; +import org.apache.iceberg.Snapshot; +import org.apache.iceberg.Table; +import org.apache.iceberg.flink.source.FlinkSplitPlanner; +import org.apache.iceberg.flink.source.ScanContext; +import org.apache.iceberg.flink.source.StreamingStartingStrategy; +import org.apache.iceberg.flink.source.split.IcebergSourceSplit; +import org.apache.iceberg.util.ThreadPools; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +@Internal +public class ContinuousSplitPlannerImpl implements ContinuousSplitPlanner { + private static final Logger LOG = LoggerFactory.getLogger(ContinuousSplitPlannerImpl.class); + + private final Table table; + private final ScanContext scanContext; + private final ExecutorService workerPool; + + public ContinuousSplitPlannerImpl(Table table, ScanContext scanContext) { + this.table = table; + this.scanContext = scanContext; + // Within a JVM, table name should be unique across sources. + // Hence it is used as worker pool thread name prefix. + this.workerPool = ThreadPools.newWorkerPool("iceberg-worker-pool-" + table.name(), scanContext.planParallelism()); + } + + @Override + public ContinuousEnumerationResult planSplits(IcebergEnumeratorPosition lastPosition) { + table.refresh(); + if (lastPosition != null) { + return discoverDeltaSplits(lastPosition); + } else { + return discoverInitialSplits(); + } + } + + /** + * Discover delta changes between @{code lastPosition} and current table snapshot + */ + private ContinuousEnumerationResult discoverDeltaSplits(IcebergEnumeratorPosition lastPosition) { + // incremental discovery mode + Snapshot currentSnapshot = table.currentSnapshot(); + if (currentSnapshot.snapshotId() == lastPosition.endSnapshotId()) { + LOG.info("Current table snapshot is already enumerated: {}", currentSnapshot.snapshotId()); + return new ContinuousEnumerationResult(Collections.emptyList(), lastPosition); + } else { + ScanContext incrementalScan = scanContext + .copyWithAppendsBetween(lastPosition.endSnapshotId(), currentSnapshot.snapshotId()); + LOG.info("Incremental scan: startSnapshotId = {}, endSnapshotId = {}", + incrementalScan.startSnapshotId(), incrementalScan.endSnapshotId()); + List<IcebergSourceSplit> splits = FlinkSplitPlanner.planIcebergSourceSplits(table, incrementalScan, workerPool); + IcebergEnumeratorPosition position = IcebergEnumeratorPosition.builder() + .startSnapshotId(lastPosition.endSnapshotId()) + .startSnapshotTimestampMs(lastPosition.endSnapshotTimestampMs()) + .endSnapshotId(currentSnapshot.snapshotId()) + .endSnapshotTimestampMs(currentSnapshot.timestampMillis()) + .build(); + LOG.info("Discovered {} splits from incremental scan: {}", splits.size(), position); + return new ContinuousEnumerationResult(splits, position); + } + } + + /** + * Discovery initial set of splits based on {@link StreamingStartingStrategy} + */ + private ContinuousEnumerationResult discoverInitialSplits() { + HistoryEntry startSnapshotEntry = getStartSnapshot(table, scanContext); + LOG.info("get startSnapshotId {} based on starting strategy {}", + startSnapshotEntry.snapshotId(), scanContext.startingStrategy()); + List<IcebergSourceSplit> splits; + if (scanContext.startingStrategy() == + StreamingStartingStrategy.TABLE_SCAN_THEN_INCREMENTAL) { + // do a full table scan first + splits = FlinkSplitPlanner.planIcebergSourceSplits(table, scanContext, workerPool); + LOG.info("Discovered {} splits from initial full table scan with snapshotId {}", + splits.size(), startSnapshotEntry); + } else { + splits = Collections.emptyList(); + } + + IcebergEnumeratorPosition position = IcebergEnumeratorPosition.builder() + .endSnapshotId(startSnapshotEntry.snapshotId()) + .endSnapshotTimestampMs(startSnapshotEntry.timestampMillis()) + .build(); + return new ContinuousEnumerationResult(splits, position); + } + + @VisibleForTesting + static HistoryEntry getStartSnapshot(Table table, ScanContext scanContext) { + List<HistoryEntry> historyEntries = table.history(); + HistoryEntry startEntry; + switch (scanContext.startingStrategy()) { + case TABLE_SCAN_THEN_INCREMENTAL: + case LATEST_SNAPSHOT: + startEntry = historyEntries.get(historyEntries.size() - 1); + break; + case EARLIEST_SNAPSHOT: + startEntry = historyEntries.get(0); + break; + case SPECIFIC_START_SNAPSHOT_ID: + Optional<HistoryEntry> matchedEntry = historyEntries.stream() + .filter(entry -> entry.snapshotId() == scanContext.startSnapshotId()) + .findFirst(); + if (matchedEntry.isPresent()) { + startEntry = matchedEntry.get(); + } else { + throw new IllegalArgumentException( + "Snapshot id not found in history: {}" + scanContext.startSnapshotId()); + } + break; + case SPECIFIC_START_SNAPSHOT_TIMESTAMP: Review comment: Probably use https://github.com/apache/iceberg/blob/master/core/src/main/java/org/apache/iceberg/util/SnapshotUtil.java#L112 -- This is an automated message from the Apache Git Service. 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