org.apache.flink.connector.pulsar.source.HashSplitSchedulingStrategy Maven / Gradle / Ivy
/*
* Licensed 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.connector.pulsar.source;
import org.apache.flink.connector.pulsar.source.split.PulsarPartitionSplit;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* SplitSchedulingStrategy for Hash mode.
*/
public class HashSplitSchedulingStrategy implements SplitSchedulingStrategy {
public static final HashSplitSchedulingStrategy INSTANCE = new HashSplitSchedulingStrategy();
private HashSplitSchedulingStrategy() {}
@Override
public int getIndexOfReader(int numReaders, PulsarPartitionSplit split) {
//must use positive hashcode.
return ((split.getTopic().hashCode() * 31) & 0x7FFFFFFF) % numReaders;
}
@Override
public void addSplitsBack(
Map> pendingPartitionSplitAssignment,
List splits,
int subtaskId,
int numReaders) {
for (PulsarPartitionSplit split : splits) {
pendingPartitionSplitAssignment.computeIfAbsent(
getIndexOfReader(numReaders, split), r -> new ArrayList<>()
).add(split);
}
}
}