stevenzwu commented on code in PR #6382: URL: https://github.com/apache/iceberg/pull/6382#discussion_r1149722119
########## flink/v1.16/flink/src/main/java/org/apache/iceberg/flink/sink/shuffle/DataStatisticsOperator.java: ########## @@ -0,0 +1,134 @@ +/* + * 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.sink.shuffle; + +import org.apache.flink.api.common.state.ListState; +import org.apache.flink.api.common.state.ListStateDescriptor; +import org.apache.flink.api.common.typeinfo.TypeHint; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.java.functions.KeySelector; +import org.apache.flink.runtime.operators.coordination.OperatorEvent; +import org.apache.flink.runtime.operators.coordination.OperatorEventGateway; +import org.apache.flink.runtime.operators.coordination.OperatorEventHandler; +import org.apache.flink.runtime.state.StateInitializationContext; +import org.apache.flink.runtime.state.StateSnapshotContext; +import org.apache.flink.streaming.api.operators.AbstractStreamOperator; +import org.apache.flink.streaming.api.operators.OneInputStreamOperator; +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; +import org.apache.iceberg.flink.sink.shuffle.statistics.DataStatistics; +import org.apache.iceberg.flink.sink.shuffle.statistics.DataStatisticsFactory; +import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; + +/** + * DataStatisticsOperator collects traffic distribution statistics. A custom partitioner shall be + * attached to the DataStatisticsOperator output. The custom partitioner leverages the statistics to + * shuffle record to improve data clustering while maintaining relative balanced traffic + * distribution to downstream subtasks. + */ +class DataStatisticsOperator<T, K> extends AbstractStreamOperator<DataStatisticsOrRecord<T, K>> + implements OneInputStreamOperator<T, DataStatisticsOrRecord<T, K>>, OperatorEventHandler { + private static final long serialVersionUID = 1L; + + // keySelector will be used to generate key from data for collecting data statistics + private final KeySelector<T, K> keySelector; + private final OperatorEventGateway operatorEventGateway; + private final DataStatisticsFactory<K> statisticsFactory; + private transient volatile DataStatistics<K> localStatistics; + private transient volatile DataStatistics<K> globalStatistics; + private transient ListState<DataStatistics<K>> globalStatisticsState; + + DataStatisticsOperator( + KeySelector<T, K> keySelector, + OperatorEventGateway operatorEventGateway, + DataStatisticsFactory<K> statisticsFactory) { + this.keySelector = keySelector; + this.operatorEventGateway = operatorEventGateway; + this.statisticsFactory = statisticsFactory; + } + + @Override + public void initializeState(StateInitializationContext context) throws Exception { + localStatistics = statisticsFactory.createDataStatistics(); + globalStatisticsState = + context + .getOperatorStateStore() + .getUnionListState( + new ListStateDescriptor<>( + "globalStatisticsState", + TypeInformation.of(new TypeHint<DataStatistics<K>>() {}))); + + if (context.isRestored()) { + int subtaskIndex = getRuntimeContext().getIndexOfThisSubtask(); + if (globalStatisticsState.get() == null + || !globalStatisticsState.get().iterator().hasNext()) { + LOG.warn("Subtask {} doesn't have global statistics state to restore", subtaskIndex); + globalStatistics = statisticsFactory.createDataStatistics(); + } else { + LOG.info("Restoring global statistics state for subtask {}", subtaskIndex); + globalStatistics = globalStatisticsState.get().iterator().next(); + } + } else { + globalStatistics = statisticsFactory.createDataStatistics(); + } + } + + @Override + public void open() throws Exception { + if (!globalStatistics.isEmpty()) { + output.collect(new StreamRecord<>(DataStatisticsOrRecord.fromDataStatistics(globalStatistics))); + } + } + + @Override + public void handleOperatorEvent(OperatorEvent evt) { + // TODO: receive event with aggregated statistics from coordinator and update globalStatistics + } + + @Override + public void processElement(StreamRecord<T> streamRecord) throws Exception { + final K key = keySelector.getKey(streamRecord.getValue()); + localStatistics.add(key); + output.collect(new StreamRecord<>(DataStatisticsOrRecord.fromRecord(streamRecord.getValue()))); + } + + @Override + public void snapshotState(StateSnapshotContext context) throws Exception { + long checkpointId = context.getCheckpointId(); + LOG.info("Taking data statistics operator snapshot for checkpoint {}", checkpointId); + + // Only subtask 0 saves the state so that globalStatisticsState(UnionListState) stores + // an exact copy of globalStatistics + if (!globalStatistics.isEmpty() && getRuntimeContext().getIndexOfThisSubtask() == 0) { Review Comment: this doesn't seem correct. we don't need the `!globalStatistics.isEmpty` condition here. otherwise, it will never change after the first checkpoint/add. ########## flink/v1.16/flink/src/main/java/org/apache/iceberg/flink/sink/shuffle/DataStatisticsOperator.java: ########## @@ -0,0 +1,134 @@ +/* + * 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.sink.shuffle; + +import org.apache.flink.api.common.state.ListState; +import org.apache.flink.api.common.state.ListStateDescriptor; +import org.apache.flink.api.common.typeinfo.TypeHint; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.java.functions.KeySelector; +import org.apache.flink.runtime.operators.coordination.OperatorEvent; +import org.apache.flink.runtime.operators.coordination.OperatorEventGateway; +import org.apache.flink.runtime.operators.coordination.OperatorEventHandler; +import org.apache.flink.runtime.state.StateInitializationContext; +import org.apache.flink.runtime.state.StateSnapshotContext; +import org.apache.flink.streaming.api.operators.AbstractStreamOperator; +import org.apache.flink.streaming.api.operators.OneInputStreamOperator; +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; +import org.apache.iceberg.flink.sink.shuffle.statistics.DataStatistics; +import org.apache.iceberg.flink.sink.shuffle.statistics.DataStatisticsFactory; +import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; + +/** + * DataStatisticsOperator collects traffic distribution statistics. A custom partitioner shall be + * attached to the DataStatisticsOperator output. The custom partitioner leverages the statistics to + * shuffle record to improve data clustering while maintaining relative balanced traffic + * distribution to downstream subtasks. + */ +class DataStatisticsOperator<T, K> extends AbstractStreamOperator<DataStatisticsOrRecord<T, K>> + implements OneInputStreamOperator<T, DataStatisticsOrRecord<T, K>>, OperatorEventHandler { + private static final long serialVersionUID = 1L; + + // keySelector will be used to generate key from data for collecting data statistics + private final KeySelector<T, K> keySelector; + private final OperatorEventGateway operatorEventGateway; + private final DataStatisticsFactory<K> statisticsFactory; + private transient volatile DataStatistics<K> localStatistics; + private transient volatile DataStatistics<K> globalStatistics; + private transient ListState<DataStatistics<K>> globalStatisticsState; + + DataStatisticsOperator( + KeySelector<T, K> keySelector, + OperatorEventGateway operatorEventGateway, + DataStatisticsFactory<K> statisticsFactory) { + this.keySelector = keySelector; + this.operatorEventGateway = operatorEventGateway; + this.statisticsFactory = statisticsFactory; + } + + @Override + public void initializeState(StateInitializationContext context) throws Exception { + localStatistics = statisticsFactory.createDataStatistics(); + globalStatisticsState = + context + .getOperatorStateStore() + .getUnionListState( + new ListStateDescriptor<>( + "globalStatisticsState", + TypeInformation.of(new TypeHint<DataStatistics<K>>() {}))); + + if (context.isRestored()) { + int subtaskIndex = getRuntimeContext().getIndexOfThisSubtask(); + if (globalStatisticsState.get() == null + || !globalStatisticsState.get().iterator().hasNext()) { + LOG.warn("Subtask {} doesn't have global statistics state to restore", subtaskIndex); + globalStatistics = statisticsFactory.createDataStatistics(); + } else { + LOG.info("Restoring global statistics state for subtask {}", subtaskIndex); + globalStatistics = globalStatisticsState.get().iterator().next(); + } + } else { + globalStatistics = statisticsFactory.createDataStatistics(); + } + } + + @Override + public void open() throws Exception { + if (!globalStatistics.isEmpty()) { + output.collect(new StreamRecord<>(DataStatisticsOrRecord.fromDataStatistics(globalStatistics))); + } + } + + @Override + public void handleOperatorEvent(OperatorEvent evt) { + // TODO: receive event with aggregated statistics from coordinator and update globalStatistics + } + + @Override + public void processElement(StreamRecord<T> streamRecord) throws Exception { + final K key = keySelector.getKey(streamRecord.getValue()); + localStatistics.add(key); + output.collect(new StreamRecord<>(DataStatisticsOrRecord.fromRecord(streamRecord.getValue()))); Review Comment: nit: maybe cache the value at the beginning of this method. `T record = streamRecord.getValue()`. I saw more of this style in the Iceberg code. ########## flink/v1.16/flink/src/main/java/org/apache/iceberg/flink/sink/shuffle/DataStatisticsOperator.java: ########## @@ -0,0 +1,134 @@ +/* + * 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.sink.shuffle; + +import org.apache.flink.api.common.state.ListState; +import org.apache.flink.api.common.state.ListStateDescriptor; +import org.apache.flink.api.common.typeinfo.TypeHint; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.java.functions.KeySelector; +import org.apache.flink.runtime.operators.coordination.OperatorEvent; +import org.apache.flink.runtime.operators.coordination.OperatorEventGateway; +import org.apache.flink.runtime.operators.coordination.OperatorEventHandler; +import org.apache.flink.runtime.state.StateInitializationContext; +import org.apache.flink.runtime.state.StateSnapshotContext; +import org.apache.flink.streaming.api.operators.AbstractStreamOperator; +import org.apache.flink.streaming.api.operators.OneInputStreamOperator; +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; +import org.apache.iceberg.flink.sink.shuffle.statistics.DataStatistics; +import org.apache.iceberg.flink.sink.shuffle.statistics.DataStatisticsFactory; +import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; + +/** + * DataStatisticsOperator collects traffic distribution statistics. A custom partitioner shall be + * attached to the DataStatisticsOperator output. The custom partitioner leverages the statistics to + * shuffle record to improve data clustering while maintaining relative balanced traffic + * distribution to downstream subtasks. + */ +class DataStatisticsOperator<T, K> extends AbstractStreamOperator<DataStatisticsOrRecord<T, K>> + implements OneInputStreamOperator<T, DataStatisticsOrRecord<T, K>>, OperatorEventHandler { + private static final long serialVersionUID = 1L; + + // keySelector will be used to generate key from data for collecting data statistics + private final KeySelector<T, K> keySelector; + private final OperatorEventGateway operatorEventGateway; + private final DataStatisticsFactory<K> statisticsFactory; + private transient volatile DataStatistics<K> localStatistics; + private transient volatile DataStatistics<K> globalStatistics; + private transient ListState<DataStatistics<K>> globalStatisticsState; + + DataStatisticsOperator( + KeySelector<T, K> keySelector, + OperatorEventGateway operatorEventGateway, + DataStatisticsFactory<K> statisticsFactory) { + this.keySelector = keySelector; + this.operatorEventGateway = operatorEventGateway; + this.statisticsFactory = statisticsFactory; + } + + @Override + public void initializeState(StateInitializationContext context) throws Exception { + localStatistics = statisticsFactory.createDataStatistics(); + globalStatisticsState = + context + .getOperatorStateStore() + .getUnionListState( + new ListStateDescriptor<>( + "globalStatisticsState", + TypeInformation.of(new TypeHint<DataStatistics<K>>() {}))); + + if (context.isRestored()) { + int subtaskIndex = getRuntimeContext().getIndexOfThisSubtask(); + if (globalStatisticsState.get() == null + || !globalStatisticsState.get().iterator().hasNext()) { + LOG.warn("Subtask {} doesn't have global statistics state to restore", subtaskIndex); + globalStatistics = statisticsFactory.createDataStatistics(); + } else { + LOG.info("Restoring global statistics state for subtask {}", subtaskIndex); + globalStatistics = globalStatisticsState.get().iterator().next(); + } + } else { + globalStatistics = statisticsFactory.createDataStatistics(); + } + } + + @Override + public void open() throws Exception { + if (!globalStatistics.isEmpty()) { + output.collect(new StreamRecord<>(DataStatisticsOrRecord.fromDataStatistics(globalStatistics))); + } + } + + @Override + public void handleOperatorEvent(OperatorEvent evt) { + // TODO: receive event with aggregated statistics from coordinator and update globalStatistics + } + + @Override + public void processElement(StreamRecord<T> streamRecord) throws Exception { + final K key = keySelector.getKey(streamRecord.getValue()); + localStatistics.add(key); + output.collect(new StreamRecord<>(DataStatisticsOrRecord.fromRecord(streamRecord.getValue()))); + } + + @Override + public void snapshotState(StateSnapshotContext context) throws Exception { + long checkpointId = context.getCheckpointId(); + LOG.info("Taking data statistics operator snapshot for checkpoint {}", checkpointId); Review Comment: nit: add subtask index to the log. E.g. `Snapshotting data statistics operator for checkpoint {} in subtask {}` ########## flink/v1.16/flink/src/main/java/org/apache/iceberg/flink/sink/shuffle/DataStatisticsOperator.java: ########## @@ -0,0 +1,134 @@ +/* + * 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.sink.shuffle; + +import org.apache.flink.api.common.state.ListState; +import org.apache.flink.api.common.state.ListStateDescriptor; +import org.apache.flink.api.common.typeinfo.TypeHint; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.java.functions.KeySelector; +import org.apache.flink.runtime.operators.coordination.OperatorEvent; +import org.apache.flink.runtime.operators.coordination.OperatorEventGateway; +import org.apache.flink.runtime.operators.coordination.OperatorEventHandler; +import org.apache.flink.runtime.state.StateInitializationContext; +import org.apache.flink.runtime.state.StateSnapshotContext; +import org.apache.flink.streaming.api.operators.AbstractStreamOperator; +import org.apache.flink.streaming.api.operators.OneInputStreamOperator; +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; +import org.apache.iceberg.flink.sink.shuffle.statistics.DataStatistics; +import org.apache.iceberg.flink.sink.shuffle.statistics.DataStatisticsFactory; +import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; + +/** + * DataStatisticsOperator collects traffic distribution statistics. A custom partitioner shall be + * attached to the DataStatisticsOperator output. The custom partitioner leverages the statistics to + * shuffle record to improve data clustering while maintaining relative balanced traffic + * distribution to downstream subtasks. + */ +class DataStatisticsOperator<T, K> extends AbstractStreamOperator<DataStatisticsOrRecord<T, K>> + implements OneInputStreamOperator<T, DataStatisticsOrRecord<T, K>>, OperatorEventHandler { + private static final long serialVersionUID = 1L; + + // keySelector will be used to generate key from data for collecting data statistics + private final KeySelector<T, K> keySelector; + private final OperatorEventGateway operatorEventGateway; + private final DataStatisticsFactory<K> statisticsFactory; + private transient volatile DataStatistics<K> localStatistics; + private transient volatile DataStatistics<K> globalStatistics; + private transient ListState<DataStatistics<K>> globalStatisticsState; + + DataStatisticsOperator( + KeySelector<T, K> keySelector, + OperatorEventGateway operatorEventGateway, + DataStatisticsFactory<K> statisticsFactory) { + this.keySelector = keySelector; + this.operatorEventGateway = operatorEventGateway; + this.statisticsFactory = statisticsFactory; + } + + @Override + public void initializeState(StateInitializationContext context) throws Exception { + localStatistics = statisticsFactory.createDataStatistics(); + globalStatisticsState = + context + .getOperatorStateStore() + .getUnionListState( + new ListStateDescriptor<>( + "globalStatisticsState", + TypeInformation.of(new TypeHint<DataStatistics<K>>() {}))); + + if (context.isRestored()) { + int subtaskIndex = getRuntimeContext().getIndexOfThisSubtask(); + if (globalStatisticsState.get() == null + || !globalStatisticsState.get().iterator().hasNext()) { + LOG.warn("Subtask {} doesn't have global statistics state to restore", subtaskIndex); + globalStatistics = statisticsFactory.createDataStatistics(); + } else { + LOG.info("Restoring global statistics state for subtask {}", subtaskIndex); + globalStatistics = globalStatisticsState.get().iterator().next(); + } + } else { + globalStatistics = statisticsFactory.createDataStatistics(); + } + } + + @Override + public void open() throws Exception { + if (!globalStatistics.isEmpty()) { + output.collect(new StreamRecord<>(DataStatisticsOrRecord.fromDataStatistics(globalStatistics))); + } + } + + @Override + public void handleOperatorEvent(OperatorEvent evt) { + // TODO: receive event with aggregated statistics from coordinator and update globalStatistics + } + + @Override + public void processElement(StreamRecord<T> streamRecord) throws Exception { + final K key = keySelector.getKey(streamRecord.getValue()); + localStatistics.add(key); + output.collect(new StreamRecord<>(DataStatisticsOrRecord.fromRecord(streamRecord.getValue()))); + } + + @Override + public void snapshotState(StateSnapshotContext context) throws Exception { + long checkpointId = context.getCheckpointId(); + LOG.info("Taking data statistics operator snapshot for checkpoint {}", checkpointId); + + // Only subtask 0 saves the state so that globalStatisticsState(UnionListState) stores + // an exact copy of globalStatistics + if (!globalStatistics.isEmpty() && getRuntimeContext().getIndexOfThisSubtask() == 0) { + globalStatisticsState.clear(); + LOG.debug("Saving global statistics {} to state", globalStatistics); Review Comment: nit: I think this should actually be info level logging. maybe add subtask index to the log. ########## flink/v1.16/flink/src/main/java/org/apache/iceberg/flink/sink/shuffle/DataStatisticsOperator.java: ########## @@ -0,0 +1,134 @@ +/* + * 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.sink.shuffle; + +import org.apache.flink.api.common.state.ListState; +import org.apache.flink.api.common.state.ListStateDescriptor; +import org.apache.flink.api.common.typeinfo.TypeHint; +import org.apache.flink.api.common.typeinfo.TypeInformation; +import org.apache.flink.api.java.functions.KeySelector; +import org.apache.flink.runtime.operators.coordination.OperatorEvent; +import org.apache.flink.runtime.operators.coordination.OperatorEventGateway; +import org.apache.flink.runtime.operators.coordination.OperatorEventHandler; +import org.apache.flink.runtime.state.StateInitializationContext; +import org.apache.flink.runtime.state.StateSnapshotContext; +import org.apache.flink.streaming.api.operators.AbstractStreamOperator; +import org.apache.flink.streaming.api.operators.OneInputStreamOperator; +import org.apache.flink.streaming.runtime.streamrecord.StreamRecord; +import org.apache.iceberg.flink.sink.shuffle.statistics.DataStatistics; +import org.apache.iceberg.flink.sink.shuffle.statistics.DataStatisticsFactory; +import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting; + +/** + * DataStatisticsOperator collects traffic distribution statistics. A custom partitioner shall be + * attached to the DataStatisticsOperator output. The custom partitioner leverages the statistics to + * shuffle record to improve data clustering while maintaining relative balanced traffic + * distribution to downstream subtasks. + */ +class DataStatisticsOperator<T, K> extends AbstractStreamOperator<DataStatisticsOrRecord<T, K>> + implements OneInputStreamOperator<T, DataStatisticsOrRecord<T, K>>, OperatorEventHandler { + private static final long serialVersionUID = 1L; + + // keySelector will be used to generate key from data for collecting data statistics + private final KeySelector<T, K> keySelector; + private final OperatorEventGateway operatorEventGateway; + private final DataStatisticsFactory<K> statisticsFactory; + private transient volatile DataStatistics<K> localStatistics; + private transient volatile DataStatistics<K> globalStatistics; + private transient ListState<DataStatistics<K>> globalStatisticsState; + + DataStatisticsOperator( + KeySelector<T, K> keySelector, + OperatorEventGateway operatorEventGateway, + DataStatisticsFactory<K> statisticsFactory) { + this.keySelector = keySelector; + this.operatorEventGateway = operatorEventGateway; + this.statisticsFactory = statisticsFactory; + } + + @Override + public void initializeState(StateInitializationContext context) throws Exception { + localStatistics = statisticsFactory.createDataStatistics(); + globalStatisticsState = + context + .getOperatorStateStore() + .getUnionListState( + new ListStateDescriptor<>( + "globalStatisticsState", + TypeInformation.of(new TypeHint<DataStatistics<K>>() {}))); + + if (context.isRestored()) { + int subtaskIndex = getRuntimeContext().getIndexOfThisSubtask(); + if (globalStatisticsState.get() == null + || !globalStatisticsState.get().iterator().hasNext()) { + LOG.warn("Subtask {} doesn't have global statistics state to restore", subtaskIndex); + globalStatistics = statisticsFactory.createDataStatistics(); + } else { + LOG.info("Restoring global statistics state for subtask {}", subtaskIndex); + globalStatistics = globalStatisticsState.get().iterator().next(); + } + } else { + globalStatistics = statisticsFactory.createDataStatistics(); + } + } + + @Override + public void open() throws Exception { + if (!globalStatistics.isEmpty()) { + output.collect(new StreamRecord<>(DataStatisticsOrRecord.fromDataStatistics(globalStatistics))); + } + } + + @Override + public void handleOperatorEvent(OperatorEvent evt) { + // TODO: receive event with aggregated statistics from coordinator and update globalStatistics + } + + @Override + public void processElement(StreamRecord<T> streamRecord) throws Exception { + final K key = keySelector.getKey(streamRecord.getValue()); Review Comment: nit: Iceberg coding style doesn't use final for stack local variables. -- This is an automated message from the Apache Git Service. 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