stevenzwu commented on code in PR #10308: URL: https://github.com/apache/iceberg/pull/10308#discussion_r1622721206
########## flink/v1.19/flink/src/main/java/org/apache/iceberg/flink/maintenance/operator/SingleThreadedIteratorSource.java: ########## @@ -0,0 +1,195 @@ +/* + * 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.maintenance.operator; + +import java.io.IOException; +import java.util.Collection; +import java.util.Iterator; +import org.apache.flink.api.connector.source.Source; +import org.apache.flink.api.connector.source.SourceReader; +import org.apache.flink.api.connector.source.SourceReaderContext; +import org.apache.flink.api.connector.source.SplitEnumerator; +import org.apache.flink.api.connector.source.SplitEnumeratorContext; +import org.apache.flink.api.connector.source.lib.util.IteratorSourceEnumerator; +import org.apache.flink.api.connector.source.lib.util.IteratorSourceReader; +import org.apache.flink.api.connector.source.lib.util.IteratorSourceSplit; +import org.apache.flink.api.java.typeutils.ResultTypeQueryable; +import org.apache.flink.core.io.SimpleVersionedSerializer; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; + +/** + * Implementation of the Source V2 API which uses an iterator to read the elements, and uses a + * single thread to do so. + * + * @param <T> The return type of the source + */ +public abstract class SingleThreadedIteratorSource<T> + implements Source< + T, + SingleThreadedIteratorSource.GlobalSplit<T>, + Collection<SingleThreadedIteratorSource.GlobalSplit<T>>>, + ResultTypeQueryable<T> { + private static final String PARALLELISM_ERROR = "Parallelism should be set to 1"; + + /** + * Creates the iterator to return the elements which then emitted by the source. + * + * @return iterator for the elements + */ + abstract Iterator<T> createIterator(); + + /** + * Serializes the iterator, which is used to save and restore the state of the source. + * + * @return serializer for the iterator + */ + abstract SimpleVersionedSerializer<Iterator<T>> getIteratorSerializer(); + + @Override + public SplitEnumerator<GlobalSplit<T>, Collection<GlobalSplit<T>>> createEnumerator( + SplitEnumeratorContext<GlobalSplit<T>> enumContext) { + Preconditions.checkArgument(enumContext.currentParallelism() == 1, PARALLELISM_ERROR); + return new IteratorSourceEnumerator<>( + enumContext, ImmutableList.of(new GlobalSplit<>(createIterator()))); + } + + @Override + public SplitEnumerator<GlobalSplit<T>, Collection<GlobalSplit<T>>> restoreEnumerator( + SplitEnumeratorContext<GlobalSplit<T>> enumContext, Collection<GlobalSplit<T>> checkpoint) { + Preconditions.checkArgument(enumContext.currentParallelism() == 1, PARALLELISM_ERROR); + return new IteratorSourceEnumerator<>(enumContext, checkpoint); + } + + @Override + public SimpleVersionedSerializer<GlobalSplit<T>> getSplitSerializer() { + return new SplitSerializer<>(getIteratorSerializer()); + } + + @Override + public SimpleVersionedSerializer<Collection<GlobalSplit<T>>> getEnumeratorCheckpointSerializer() { + return new CheckpointSerializer<>(getIteratorSerializer()); + } + + @Override + public SourceReader<T, GlobalSplit<T>> createReader(SourceReaderContext readerContext) + throws Exception { + Preconditions.checkArgument(readerContext.getIndexOfSubtask() == 0, PARALLELISM_ERROR); + return new IteratorSourceReader<>(readerContext); + } + + /** The single split of the {@link SingleThreadedIteratorSource}. */ + static class GlobalSplit<T> implements IteratorSourceSplit<T, Iterator<T>> { + private final Iterator<T> iterator; + + GlobalSplit(Iterator<T> iterator) { + this.iterator = iterator; + } + + @Override + public String splitId() { + return "1"; + } + + @Override + public Iterator<T> getIterator() { + return iterator; + } + + @Override + public IteratorSourceSplit<T, Iterator<T>> getUpdatedSplitForIterator( + final Iterator<T> newIterator) { + return new GlobalSplit<>(newIterator); + } + + @Override + public String toString() { + return String.format("GlobalSplit (%s)", iterator); + } + } + + private static final class SplitSerializer<T> + implements SimpleVersionedSerializer<GlobalSplit<T>> { + private final SimpleVersionedSerializer<Iterator<T>> serializer; + + SplitSerializer(SimpleVersionedSerializer<Iterator<T>> serializer) { Review Comment: nit: you want to name it `iteratorSerializer` to be consistent with the `Enumerator/CheckpointSerializer` below this class? ########## flink/v1.19/flink/src/main/java/org/apache/iceberg/flink/maintenance/operator/MonitorSource.java: ########## @@ -0,0 +1,200 @@ +/* + * 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.maintenance.operator; + +import java.io.IOException; +import java.util.Iterator; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.connector.source.Boundedness; +import org.apache.flink.api.connector.source.SourceReader; +import org.apache.flink.api.connector.source.SourceReaderContext; +import org.apache.flink.api.connector.source.util.ratelimit.RateLimitedSourceReader; +import org.apache.flink.api.connector.source.util.ratelimit.RateLimiter; +import org.apache.flink.api.connector.source.util.ratelimit.RateLimiterStrategy; +import org.apache.flink.core.io.SimpleVersionedSerializer; +import org.apache.flink.core.memory.DataInputDeserializer; +import org.apache.flink.core.memory.DataOutputSerializer; +import org.apache.iceberg.Snapshot; +import org.apache.iceberg.Table; +import org.apache.iceberg.flink.TableLoader; +import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; +import org.apache.iceberg.relocated.com.google.common.base.MoreObjects; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** Monitors an Iceberg table for changes */ +public class MonitorSource extends SingleThreadedIteratorSource<TableChange> { + private static final Logger LOG = LoggerFactory.getLogger(MonitorSource.class); + + private final TableLoader tableLoader; + private final RateLimiterStrategy rateLimiterStrategy; + private final long maxReadBack; + + /** + * Creates a {@link org.apache.flink.api.connector.source.Source} which monitors an Iceberg table + * for changes. + * + * @param tableLoader used for accessing the table + * @param rateLimiterStrategy limits the frequency the table is checked + * @param maxReadBack sets the number of snapshots read before stopping change collection + */ + public MonitorSource( + TableLoader tableLoader, RateLimiterStrategy rateLimiterStrategy, long maxReadBack) { + Preconditions.checkNotNull(tableLoader, "Table loader should no be null"); + Preconditions.checkNotNull(rateLimiterStrategy, "Rate limiter strategy should no be null"); + Preconditions.checkArgument(maxReadBack > 0, "Need to read at least 1 snapshot to work"); Review Comment: should we use builder to separate optional and non optional args? ########## flink/v1.19/flink/src/main/java/org/apache/iceberg/flink/maintenance/operator/MonitorSource.java: ########## @@ -0,0 +1,187 @@ +/* + * 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.maintenance.operator; + +import java.io.IOException; +import java.util.Iterator; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.connector.source.Boundedness; +import org.apache.flink.api.connector.source.SourceReader; +import org.apache.flink.api.connector.source.SourceReaderContext; +import org.apache.flink.api.connector.source.util.ratelimit.RateLimitedSourceReader; +import org.apache.flink.api.connector.source.util.ratelimit.RateLimiter; +import org.apache.flink.api.connector.source.util.ratelimit.RateLimiterStrategy; +import org.apache.flink.core.io.SimpleVersionedSerializer; +import org.apache.flink.core.memory.DataInputDeserializer; +import org.apache.flink.core.memory.DataOutputSerializer; +import org.apache.iceberg.Snapshot; +import org.apache.iceberg.Table; +import org.apache.iceberg.flink.TableLoader; +import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** Monitors an Iceberg table for changes */ +public class MonitorSource extends SingleThreadedIteratorSource<TableChange> { + private static final Logger LOG = LoggerFactory.getLogger(MonitorSource.class); + + private final TableLoader tableLoader; + private final RateLimiterStrategy rateLimiterStrategy; + private final long maxReadBack; + + /** + * Creates a {@link org.apache.flink.api.connector.source.Source} which monitors an Iceberg table + * for changes. + * + * @param tableLoader used for accessing the table + * @param rateLimiterStrategy limits the frequency the table is checked + * @param maxReadBack sets the number of snapshots read before stopping change collection + */ + public MonitorSource( + TableLoader tableLoader, RateLimiterStrategy rateLimiterStrategy, long maxReadBack) { + Preconditions.checkNotNull(tableLoader, "Table loader should no be null"); + Preconditions.checkNotNull(rateLimiterStrategy, "Rate limiter strategy should no be null"); + Preconditions.checkArgument(maxReadBack > 0, "Need to read at least 1 snapshot to work"); + + this.tableLoader = tableLoader; + this.rateLimiterStrategy = rateLimiterStrategy; + this.maxReadBack = maxReadBack; + } + + @Override + public Boundedness getBoundedness() { + return Boundedness.CONTINUOUS_UNBOUNDED; + } + + @Override + public TypeInformation<TableChange> getProducedType() { + return TypeInformation.of(TableChange.class); + } + + @Override + public Iterator<TableChange> createIterator() { + return new SchedulerEventIterator(tableLoader, null, maxReadBack); + } + + @Override + public SimpleVersionedSerializer<Iterator<TableChange>> getIteratorSerializer() { + return new SchedulerEventIteratorSerializer(tableLoader, maxReadBack); + } + + @Override + public SourceReader<TableChange, GlobalSplit<TableChange>> createReader( + SourceReaderContext readerContext) throws Exception { + RateLimiter rateLimiter = rateLimiterStrategy.createRateLimiter(1); + return new RateLimitedSourceReader<>(super.createReader(readerContext), rateLimiter); + } + + /** The Iterator which returns the latest changes on an Iceberg table. */ + @VisibleForTesting + static class SchedulerEventIterator implements Iterator<TableChange> { + private Long lastSnapshotId; + private final long maxReadBack; + private final Table table; + + SchedulerEventIterator(TableLoader tableLoader, Long lastSnapshotId, long maxReadBack) { + this.lastSnapshotId = lastSnapshotId; + this.maxReadBack = maxReadBack; + tableLoader.open(); + this.table = tableLoader.loadTable(); + } + + @Override + public boolean hasNext() { + return true; + } + + @Override + public TableChange next() { + try { + table.refresh(); + Snapshot currentSnapshot = table.currentSnapshot(); + Long current = currentSnapshot != null ? currentSnapshot.snapshotId() : null; + Long checking = current; + TableChange event = new TableChange(0, 0, 0L, 0L, 0); + long readBack = 0; + while (checking != null && !checking.equals(lastSnapshotId) && ++readBack <= maxReadBack) { + Snapshot snapshot = table.snapshot(checking); + if (snapshot != null) { + LOG.debug("Reading snapshot {}", snapshot.snapshotId()); + event.merge(new TableChange(snapshot, table.io())); + checking = snapshot.parentId(); + } else { + // If the last snapshot has been removed from the history + checking = null; + } + } + + lastSnapshotId = current; + return event; + } catch (Exception e) { + LOG.warn("Failed to fetch table changes for {}", table, e); + return new TableChange(0, 0, 0L, 0L, 0); Review Comment: nit: I also find the `TableChange(0, 0, 0L, 0L, 0)` a bit difficult to read. maybe `constant` is not accurate here. what about `TableChange.empty()/zero()` for creating an initial object. `TableChange` is currently implemented as a mutable object, which is fine. if we choose to, it can also be implemented as immutable object by returning a new merged object from `merge` method. I am not opinionated here. either way (mutable or immutable) is fine. ########## flink/v1.19/flink/src/main/java/org/apache/iceberg/flink/maintenance/operator/SingleThreadedIteratorSource.java: ########## @@ -0,0 +1,195 @@ +/* + * 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.maintenance.operator; + +import java.io.IOException; +import java.util.Collection; +import java.util.Iterator; +import org.apache.flink.api.connector.source.Source; +import org.apache.flink.api.connector.source.SourceReader; +import org.apache.flink.api.connector.source.SourceReaderContext; +import org.apache.flink.api.connector.source.SplitEnumerator; +import org.apache.flink.api.connector.source.SplitEnumeratorContext; +import org.apache.flink.api.connector.source.lib.util.IteratorSourceEnumerator; +import org.apache.flink.api.connector.source.lib.util.IteratorSourceReader; +import org.apache.flink.api.connector.source.lib.util.IteratorSourceSplit; +import org.apache.flink.api.java.typeutils.ResultTypeQueryable; +import org.apache.flink.core.io.SimpleVersionedSerializer; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; + +/** + * Implementation of the Source V2 API which uses an iterator to read the elements, and uses a + * single thread to do so. + * + * @param <T> The return type of the source + */ +public abstract class SingleThreadedIteratorSource<T> + implements Source< + T, + SingleThreadedIteratorSource.GlobalSplit<T>, + Collection<SingleThreadedIteratorSource.GlobalSplit<T>>>, + ResultTypeQueryable<T> { + private static final String PARALLELISM_ERROR = "Parallelism should be set to 1"; + + /** + * Creates the iterator to return the elements which then emitted by the source. + * + * @return iterator for the elements + */ + abstract Iterator<T> createIterator(); + + /** + * Serializes the iterator, which is used to save and restore the state of the source. + * + * @return serializer for the iterator + */ + abstract SimpleVersionedSerializer<Iterator<T>> getIteratorSerializer(); Review Comment: nit: Iceberg coding style typically don't use `get`. maybe just `iteratorSerializer`? ########## flink/v1.19/flink/src/main/java/org/apache/iceberg/flink/maintenance/operator/SingleThreadedIteratorSource.java: ########## @@ -0,0 +1,195 @@ +/* + * 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.maintenance.operator; + +import java.io.IOException; +import java.util.Collection; +import java.util.Iterator; +import org.apache.flink.api.connector.source.Source; +import org.apache.flink.api.connector.source.SourceReader; +import org.apache.flink.api.connector.source.SourceReaderContext; +import org.apache.flink.api.connector.source.SplitEnumerator; +import org.apache.flink.api.connector.source.SplitEnumeratorContext; +import org.apache.flink.api.connector.source.lib.util.IteratorSourceEnumerator; +import org.apache.flink.api.connector.source.lib.util.IteratorSourceReader; +import org.apache.flink.api.connector.source.lib.util.IteratorSourceSplit; +import org.apache.flink.api.java.typeutils.ResultTypeQueryable; +import org.apache.flink.core.io.SimpleVersionedSerializer; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; + +/** + * Implementation of the Source V2 API which uses an iterator to read the elements, and uses a + * single thread to do so. Review Comment: nit: we probably can also mention that this only works with a global singleton split. ########## flink/v1.19/flink/src/main/java/org/apache/iceberg/flink/maintenance/operator/SingleThreadedIteratorSource.java: ########## @@ -0,0 +1,195 @@ +/* + * 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.maintenance.operator; + +import java.io.IOException; +import java.util.Collection; +import java.util.Iterator; +import org.apache.flink.api.connector.source.Source; +import org.apache.flink.api.connector.source.SourceReader; +import org.apache.flink.api.connector.source.SourceReaderContext; +import org.apache.flink.api.connector.source.SplitEnumerator; +import org.apache.flink.api.connector.source.SplitEnumeratorContext; +import org.apache.flink.api.connector.source.lib.util.IteratorSourceEnumerator; +import org.apache.flink.api.connector.source.lib.util.IteratorSourceReader; +import org.apache.flink.api.connector.source.lib.util.IteratorSourceSplit; +import org.apache.flink.api.java.typeutils.ResultTypeQueryable; +import org.apache.flink.core.io.SimpleVersionedSerializer; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; +import org.apache.iceberg.relocated.com.google.common.collect.Lists; + +/** + * Implementation of the Source V2 API which uses an iterator to read the elements, and uses a + * single thread to do so. + * + * @param <T> The return type of the source + */ +public abstract class SingleThreadedIteratorSource<T> + implements Source< + T, + SingleThreadedIteratorSource.GlobalSplit<T>, + Collection<SingleThreadedIteratorSource.GlobalSplit<T>>>, + ResultTypeQueryable<T> { + private static final String PARALLELISM_ERROR = "Parallelism should be set to 1"; + + /** + * Creates the iterator to return the elements which then emitted by the source. + * + * @return iterator for the elements + */ + abstract Iterator<T> createIterator(); + + /** + * Serializes the iterator, which is used to save and restore the state of the source. + * + * @return serializer for the iterator + */ + abstract SimpleVersionedSerializer<Iterator<T>> getIteratorSerializer(); + + @Override + public SplitEnumerator<GlobalSplit<T>, Collection<GlobalSplit<T>>> createEnumerator( + SplitEnumeratorContext<GlobalSplit<T>> enumContext) { + Preconditions.checkArgument(enumContext.currentParallelism() == 1, PARALLELISM_ERROR); + return new IteratorSourceEnumerator<>( + enumContext, ImmutableList.of(new GlobalSplit<>(createIterator()))); + } + + @Override + public SplitEnumerator<GlobalSplit<T>, Collection<GlobalSplit<T>>> restoreEnumerator( + SplitEnumeratorContext<GlobalSplit<T>> enumContext, Collection<GlobalSplit<T>> checkpoint) { + Preconditions.checkArgument(enumContext.currentParallelism() == 1, PARALLELISM_ERROR); + return new IteratorSourceEnumerator<>(enumContext, checkpoint); + } + + @Override + public SimpleVersionedSerializer<GlobalSplit<T>> getSplitSerializer() { + return new SplitSerializer<>(getIteratorSerializer()); + } + + @Override + public SimpleVersionedSerializer<Collection<GlobalSplit<T>>> getEnumeratorCheckpointSerializer() { + return new CheckpointSerializer<>(getIteratorSerializer()); + } + + @Override + public SourceReader<T, GlobalSplit<T>> createReader(SourceReaderContext readerContext) + throws Exception { + Preconditions.checkArgument(readerContext.getIndexOfSubtask() == 0, PARALLELISM_ERROR); + return new IteratorSourceReader<>(readerContext); + } + + /** The single split of the {@link SingleThreadedIteratorSource}. */ + static class GlobalSplit<T> implements IteratorSourceSplit<T, Iterator<T>> { + private final Iterator<T> iterator; + + GlobalSplit(Iterator<T> iterator) { + this.iterator = iterator; + } + + @Override + public String splitId() { + return "1"; + } + + @Override + public Iterator<T> getIterator() { + return iterator; + } + + @Override + public IteratorSourceSplit<T, Iterator<T>> getUpdatedSplitForIterator( + final Iterator<T> newIterator) { + return new GlobalSplit<>(newIterator); + } + + @Override + public String toString() { + return String.format("GlobalSplit (%s)", iterator); + } + } + + private static final class SplitSerializer<T> + implements SimpleVersionedSerializer<GlobalSplit<T>> { + private final SimpleVersionedSerializer<Iterator<T>> serializer; + + SplitSerializer(SimpleVersionedSerializer<Iterator<T>> serializer) { + this.serializer = serializer; + } + + private static final int CURRENT_VERSION = 1; + + @Override + public int getVersion() { + return CURRENT_VERSION; + } + + @Override + public byte[] serialize(GlobalSplit<T> split) throws IOException { + return serializer.serialize(split.iterator); + } + + @Override + public GlobalSplit<T> deserialize(int version, byte[] serialized) throws IOException { + return new GlobalSplit<>(serializer.deserialize(version, serialized)); + } + } + + private static final class CheckpointSerializer<T> Review Comment: nit: `EnumeratorSerializer` seems more accurate -- This is an automated message from the Apache Git Service. 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