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TeraDistribution.java
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TeraDistribution.java
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/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (https://stratosphere.eu)
*
* 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
*
* https://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 eu.stratosphere.example.record.sort.terasort;
import java.io.DataInput;
import java.io.DataOutput;
import eu.stratosphere.api.common.distributions.DataDistribution;
import eu.stratosphere.types.Key;
/**
* This class implements the uniform data distribution of the TeraSort benchmark.
*/
public class TeraDistribution implements DataDistribution {
private static final long serialVersionUID = 1L;
private static final int ALPHABETH_SIZE = 95;
@Override
public Key[] getBucketBoundary(int bucketNum, int totalNumBuckets) {
final byte[] buf = new byte[TeraKey.KEY_SIZE];
double threshold = (double) ALPHABETH_SIZE / (double) (totalNumBuckets + 1) * (double) (bucketNum + 1);
for (int i = 0; i < buf.length; ++i) {
final int ch = (int) Math.floor(threshold) % ALPHABETH_SIZE;
buf[i] = (byte) (' ' + ch);
threshold = threshold - (double) ch;
threshold = threshold * ALPHABETH_SIZE;
}
return new TeraKey[] { new TeraKey(buf, 0) };
}
@Override
public int getNumberOfFields() {
return 1;
}
@Override
public void write(DataOutput out) {}
@Override
public void read(DataInput in) {}
}