package com.educoder.bigData.sharedbicycle;
import java.io.IOException;
import java.math.BigDecimal;
import java.math.RoundingMode;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.Scanner;
import org.apache.commons.lang3.time.DateFormatUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.conf.Configured;
import org.apache.hadoop.hbase.CompareOperator;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.filter.BinaryComparator;
import org.apache.hadoop.hbase.filter.Filter;
import org.apache.hadoop.hbase.filter.FilterList;
import org.apache.hadoop.hbase.filter.SingleColumnValueFilter;
import org.apache.hadoop.hbase.filter.SubstringComparator;
import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
import org.apache.hadoop.hbase.mapreduce.TableMapReduceUtil;
import org.apache.hadoop.hbase.mapreduce.TableMapper;
import org.apache.hadoop.hbase.mapreduce.TableReducer;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.util.Tool;
import com.educoder.bigData.util.HbaseUtil;
public class AverageVehicleMapReduce extends Configured implements Tool {
public static final byte[] family = "info".getBytes();
public static class MyMapper extends TableMapper
protected void map(ImmutableBytesWritable rowKey, Result result, Context context)
throws IOException, InterruptedException {
String beginTime = Bytes.toString(result.getValue(family, "beginTime".getBytes()));
String format = DateFormatUtils.format(Long.parseLong(beginTime), "yyyy-MM-dd", Locale.CHINA);
BytesWritable bytesWritable = new BytesWritable(Bytes.toBytes(format));
context.write(new Text("河北省保定市雄县-韩庄村"), bytesWritable);
}
}
public static class MyTableReducer extends TableReducer
@Override
public void reduce(Text key, Iterable
throws IOException, InterruptedException {
double sum = 0;
int length = 0;
Map
for (BytesWritable price : values) {
byte[] copyBytes = price.copyBytes();
String string = Bytes.toString(copyBytes);
if (map.containsKey(string)) {
Integer integer = map.get(string) + 1;
map.put(string, integer);
} else {
map.put(string, new Integer(1));
}
}
Collection
for (Integer i : values2) {
length++;
sum += i;
}
BigDecimal decimal = new BigDecimal(sum / length);
BigDecimal setScale = decimal.setScale(2, RoundingMode. HALF_DOWN);
Put put = new Put(Bytes.toBytes(key.toString()));
put.addColumn(family, "avgNum".getBytes(), Bytes.toBytes(setScale.toString()));
context.write(null, put);
}
}
public int run(String[] args) throws Exception {
// 配置Job
Configuration conf = HbaseUtil.conf;
//Scanner sc = new Scanner(System.in);
//String arg1 = sc.next();
//String arg2 = sc.next();
String arg1 = "t_shared_bicycle";
String arg2 = "t_bicycle_avgnum";
try {
HbaseUtil.createTable(arg2, new String[] { "info" });
} catch (Exception e) {
// 创建表失败
e.printStackTrace();
}
Job job = configureJob(conf, new String[] { arg1, arg2 });
return job.waitForCompletion(true) ? 0 : 1;
}
private Job configureJob(Configuration conf, String[] args) throws IOException {
String tablename = args[0];
String targetTable = args[1];
Job job = new Job(conf, tablename);
Scan scan = new Scan();
scan.setCaching(300);
scan.setCacheBlocks(false);// 在mapreduce程序中千万不要设置允许缓存
//设置过滤
ArrayList
Filter destinationFilter =new SingleColumnValueFilter(Bytes.toBytes("info"), Bytes.toBytes("destination"),
CompareOperator.EQUAL, new SubstringComparator("韩庄村"));
Filter departure = new SingleColumnValueFilter(Bytes.toBytes("info"), Bytes.toBytes("departure"),
CompareOperator.EQUAL, Bytes.toBytes("河北省保定市雄县"));
listForFilters.add(departure);
listForFilters.add(destinationFilter);
scan.setCaching(300);
scan.setCacheBlocks(false);
Filter filters = new FilterList(listForFilters);
scan.setFilter(filters);
// 初始化Mapreduce程序
TableMapReduceUtil.initTableMapperJob(tablename, scan, MyMapper.class, Text.class, BytesWritable.class, job);
// 初始化Reduce
TableMapReduceUtil.initTableReducerJob(targetTable, // output table
MyTableReducer.class, // reducer class
job);
job.setNumReduceTasks(1);
return job;
}
}



