com.opentable.kafka.partition.EvenlyDistributedInstanceToPartitionMapper 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 com.opentable.kafka.partition;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
/**
* This is the standard immplementation, which simply distributes the partitions evenly (but consistently)
* across the instances.
*/
public class EvenlyDistributedInstanceToPartitionMapper implements InstanceToPartitionMapper{
@Override
public Multimap instanceToPartitionMap(final int partitionCount, final int instanceCount) {
final Multimap map = HashMultimap.create();
for (int partition = 0; partition < partitionCount; partition++) {
int assignedInstance = partition % instanceCount;
map.put(assignedInstance, partition);
}
return map;
}
}