/**
* 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 io.dstream.tez.io;
import org.apache.tez.runtime.library.partitioner.HashPartitioner;
import io.dstream.support.Classifier;
/**
*
*/
public class TezDelegatingPartitioner extends HashPartitioner {
private static Classifier delegatingClassifier;
public static void setDelegator(Classifier classifier){
delegatingClassifier = classifier;
}
/**
*
*/
@Override
public int getPartition(Object key, Object value, int numPartitions) {
return this.doGetPartition((KeyWritable)key, (ValueWritable<?>)value, numPartitions);
}
/**
*
*/
private int doGetPartition(KeyWritable key, ValueWritable<?> value, int numPartitions) {
int partitionId;
Object valueToUse = key;
if (key.getValue() == null){
valueToUse = value.getValue();
}
else {
valueToUse = key.getValue();
}
if (delegatingClassifier != null){
partitionId = delegatingClassifier.getClassificationId(valueToUse);
}
else {
partitionId = super.getPartition(valueToUse, null, numPartitions);
}
return partitionId;
}
}