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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,
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* See the License for the specific language governing permissions and
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package org.apache.pig.backend.hadoop.executionengine.tez.runtime;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.io.Writable;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.partitioners.DiscreteProbabilitySampleGenerator;
import org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.partitioners.WeightedRangePartitioner;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.InternalMap;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.builtin.FindQuantiles;
import org.apache.pig.impl.io.PigNullableWritable;
import org.apache.tez.runtime.library.common.ConfigUtils;
public class WeightedRangePartitionerTez extends WeightedRangePartitioner {
private static final Log LOG = LogFactory.getLog(WeightedRangePartitionerTez.class);
private Integer estimatedNumPartitions;
@Override
public int getPartition(PigNullableWritable key, Writable value,
int numPartitions){
if (estimatedNumPartitions!=null) {
numPartitions = estimatedNumPartitions;
}
return super.getPartition(key, value, numPartitions);
}
@Override
public void init() {
Map<String, Object> quantileMap = null;
if (PigProcessor.sampleMap != null) {
// We've collected sampleMap in PigProcessor
quantileMap = PigProcessor.sampleMap;
} else {
LOG.warn("Quantiles map is empty");
inited = true;
return;
}
long start = System.currentTimeMillis();
try {
DataBag quantilesList = (DataBag) quantileMap.get(FindQuantiles.QUANTILES_LIST);
InternalMap weightedPartsData = (InternalMap) quantileMap.get(FindQuantiles.WEIGHTED_PARTS);
estimatedNumPartitions = (Integer)quantileMap.get(PigProcessor.ESTIMATED_NUM_PARALLELISM);
convertToArray(quantilesList);
for (Entry<Object, Object> ent : weightedPartsData.entrySet()) {
Tuple key = (Tuple) ent.getKey(); // sample item which repeats
float[] probVec = getProbVec((Tuple) ent.getValue());
weightedParts.put(getPigNullableWritable(key),
new DiscreteProbabilitySampleGenerator(probVec));
}
} catch (Exception e) {
throw new RuntimeException(e);
}
comparator = ConfigUtils.getIntermediateInputKeyComparator(job);
LOG.info("Initialized WeightedRangePartitionerTez. Time taken: " + (System.currentTimeMillis() - start));
inited = true;
}
}