/*
* 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 org.apache.kylin.engine.mr.steps;
///*
// * Copyright 2013-2014 eBay Software Foundation
// *
// * 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.kylin.index.cube;
//
//import java.io.IOException;
//
//import org.apache.hadoop.io.LongWritable;
//import org.apache.hadoop.io.Text;
//import org.apache.hadoop.mapreduce.Mapper;
//
///**
// * @author xjiang
// *
// */
//public class KeyDistributionMapper extends KylinMapper<Text, Text, Text, LongWritable> {
//
// private int headerLength;
//
// private Text currentKey;
// private long outputLong;
// private Text outputKey;
// private LongWritable outputValue;
// private int columnPercentage;
// private int allRowCount;
//
// @Override
// protected void setup(Context context) throws IOException {
//super.publishConfiguration(context.getConfiguration());
// String percentStr = context.getConfiguration().get(KeyDistributionJob.KEY_COLUMN_PERCENTAGE);
// this.columnPercentage = Integer.valueOf(percentStr).intValue();
// if (this.columnPercentage <= 0 || this.columnPercentage >= 100) {
// this.columnPercentage = 20;
// }
// String headerLenStr = context.getConfiguration().get(KeyDistributionJob.KEY_HEADER_LENGTH);
// this.headerLength = Integer.valueOf(headerLenStr).intValue();
//
// currentKey = new Text();
// outputLong = 0;
// outputKey = new Text();
// outputValue = new LongWritable(1);
// allRowCount = 0;
// }
//
// @Override
// protected void cleanup(Context context) throws IOException, InterruptedException {
// emit(context); // emit the last holding record
//
// byte[] zerokey = new byte[] { 0 };
// outputKey.set(zerokey);
// outputValue.set(allRowCount);
// context.write(outputKey, outputValue);
// }
//
// @Override
// public void map(Text key, Text value, Context context) throws IOException, InterruptedException {
// byte[] bytes = key.getBytes();
// int columnLength = bytes.length - this.headerLength;
// int columnPrefixLen = columnLength * this.columnPercentage / 100;
// if (columnPrefixLen == 0 && columnLength > 0) {
// columnPrefixLen = 1;
// }
// if (columnPrefixLen > 0) {
// currentKey.set(bytes, 0, this.headerLength + columnPrefixLen);
// } else {
// currentKey.set(bytes);
// }
//
// allRowCount++;
//
// if (outputKey.getLength() == 0) { // first record
// outputKey.set(currentKey);
// outputLong = 1;
// } else if (outputKey.equals(currentKey)) { // same key, note input is sorted
// outputLong++;
// } else { // the next key
// emit(context);
// outputKey.set(currentKey);
// outputLong = 1;
// }
// }
//
// private void emit(Context context) throws IOException, InterruptedException {
// if (outputLong == 0)
// return;
//
// outputValue.set(outputLong);
// context.write(outputKey, outputValue);
// }
// }