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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://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.flink.runtime.checkpoint;
import org.apache.flink.api.java.tuple.Tuple2;
import org.apache.flink.runtime.state.OperatorStateHandle;
import org.apache.flink.runtime.state.OperatorStreamStateHandle;
import org.apache.flink.runtime.state.StreamStateHandle;
import org.apache.flink.util.Preconditions;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.EnumMap;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Current default implementation of {@link OperatorStateRepartitioner} that redistributes state in round robin fashion.
*/
public class RoundRobinOperatorStateRepartitioner implements OperatorStateRepartitioner {
public static final OperatorStateRepartitioner INSTANCE = new RoundRobinOperatorStateRepartitioner();
private static final boolean OPTIMIZE_MEMORY_USE = false;
@Override
public List> repartitionState(
List previousParallelSubtaskStates,
int newParallelism) {
Preconditions.checkNotNull(previousParallelSubtaskStates);
Preconditions.checkArgument(newParallelism > 0);
// Reorganize: group by (State Name -> StreamStateHandle + Offsets)
GroupByStateNameResults nameToStateByMode = groupByStateName(previousParallelSubtaskStates);
if (OPTIMIZE_MEMORY_USE) {
previousParallelSubtaskStates.clear(); // free for GC at to cost that old handles are no longer available
}
// Assemble result from all merge maps
List> result = new ArrayList<>(newParallelism);
// Do the actual repartitioning for all named states
List