Hadoop综合项目——二手房统计分析（MapReduce篇）

Hadoop综合项目——二手房统计分析（MapReduce篇）

文章目录

• Hadoop综合项目——二手房统计分析（MapReduce篇）
• • 0、 写在前面
  • 1、MapReduce统计分析
  • • 1.1 统计四大一线城市房价的最值
    • 1.2 按照城市分区统计二手房数量
    • 1.3 根据二手房信息发布时间排序统计
    • 1.4 统计二手房四大一线城市总价Top5
    • 1.5 基于二手房总价实现自定义分区全排序
    • 1.6 基于建造年份和房子总价的二次排序
    • 1.7 自定义类统计二手房地理位置对应数量
    • 1.8 统计二手房标签的各类比例
  • 2、数据及源代码
  • 3、总结

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0、 写在前面

• Windows版本：Windows10
• Linux版本：Ubuntu Kylin 16.04
• JDK版本：Java8
• Hadoop版本：Hadoop-2.7.1
• Hive版本：Hive1.2.2
• IDE：IDEA 2020.2.3
• IDE：Pycharm 2021.1.3
• IDE：Eclipse3.8

1、MapReduce统计分析

通过MapReduce对最值、排序、TopN、自定义分区排序、二次排序、自定义类、占比等8个方面的统计分析

1.1 统计四大一线城市房价的最值

• 分析目的：

二手房房价的最值是体现一个城市经济的重要因素，也是顾客购买的衡量因素之一。

• 代码：

Driver端：

public class MaxMinTotalPriceByCityDriver {
    public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
        Configuration conf = new Configuration();
        Job job = Job.getInstance(conf, "MaxMinTotalPriceByCity");
        job.setJarByClass(MaxMinTotalPriceByCityDriver.class);
        job.setMapperClass(MaxMinTotalPriceByCityMapper.class);
        job.setReducerClass(MaxMinTotalPriceByCityReducer.class);
        job.setMapOutputKeyClass(Text.class);
        job.setMapOutputValueClass(IntWritable.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(Text.class);
        FileInputFormat.setInputPaths(job, new Path("datas/tb_house.txt"));
        FileOutputFormat.setOutputPath(job, new Path("MapReduce/out/MaxMinTotalPriceByCity"));
        job.waitForCompletion(true);
    }
}

• Mapper端：

public class MaxMinTotalPriceByCityMapper extends Mapper<Object, Text, Text, IntWritable> {
    private Text outk = new Text();
    private IntWritable outv = new IntWritable();
    @Override
    protected void map(Object key, Text value, Context out) throws IOException, InterruptedException {
        String line = value.toString();
        String[] data = line.split("\t");
        outk.set(data[1]);      // city
        outv.set(Integer.parseInt(data[6]));        // total
        out.write(outk, outv);
    }
}

Reducer端：

public class MaxMinTotalPriceByCityReducer extends Reducer<Text, IntWritable, Text, Text> {
    @Override
    protected void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
        List<Integer> totalList = new ArrayList<Integer>();
        Iterator<IntWritable> iterator = values.iterator();
        while (iterator.hasNext()) {
            totalList.add(iterator.next().get());
        }
        Collections.sort(totalList);
        int max = totalList.get(totalList.size() - 1);
        int min = totalList.get(0);
        Text outv = new Text();
        outv.set("房子总价最大、小值分别为：" + String.valueOf(max) + "万元," + String.valueOf(min) + "万元");
        context.write(key, outv);
    }
}

• 运行情况：

• 结果：

  

1.2 按照城市分区统计二手房数量

• 分析目的：

二手房的数量是了解房子基本情况的维度之一，数量的多少在一定程度上体现了房子的受欢迎度。

• 代码：

Driver端：

public class HouseCntByCityDriver {
    public static void main(String[] args) throws Exception {
        args = new String[] { "/input/datas/tb_house.txt", "/output/HouseCntByCity" };
        Configuration conf = new Configuration();
        conf.set("fs.defaultFS", "hdfs://node01:9000");
        Job job = Job.getInstance(conf, "HouseCntByCity");
        job.setJarByClass(HouseCntByCityDriver.class);
        job.setMapperClass(HouseCntByCityMapper.class);
        job.setReducerClass(HouseCntByCityReducer.class);
        job.setMapOutputKeyClass(Text.class);
        job.setMapOutputValueClass(IntWritable.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);
        job.setPartitionerClass(CityPartitioner.class);
        job.setNumReduceTasks(4);
        FileInputFormat.addInputPath(job, new Path(args[0]));
        FileOutputFormat.setOutputPath(job, new Path(args[1]));
        job.waitForCompletion(true);
    }
}

Mapper端：

public class HouseCntByCityMapper extends Mapper<Object, Text, Text, IntWritable> {
    private Text outk = new Text();
    private IntWritable outv = new IntWritable(1);
    @Override
    protected void map(Object key, Text value, Context context) throws IOException, InterruptedException {
        String line = value.toString();
        String[] data = line.split("\t");
        outk.set(new Text(data[1]));
        context.write(outk, outv);
    }
}

Reducer端：

public class HouseCntByCityReducer extends Reducer<Text, IntWritable, Text, IntWritable> {
    @Override
    protected void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
        int sum = 0;
        for (IntWritable val : values) sum += val.get();
        context.write(key, new IntWritable(sum));
    }
}

• 运行情况：

• 结果：

1.3 根据二手房信息发布时间排序统计

• 分析目的：

二手房的信息发布时间是了解房子基本情况的维度之一，在一定程度上，顾客倾向于最新的房源信息。

• 代码：

Driver端：

public class AcessHousePubTimeSortDriver {
    public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
        Configuration conf = new Configuration()
        Job job = Job.getInstance(conf, "AcessHousePubTimeSort");
        job.setJarByClass(AcessHousePubTimeSortDriver.class);
        job.setMapperClass(AcessHousePubTimeSortMapper.class);
        job.setReducerClass(AcessHousePubTimeSortReducer.class);
        job.setMapOutputKeyClass(Text.class);
        job.setMapOutputValueClass(IntWritable.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);
        FileInputFormat.setInputPaths(job, new Path("datas/tb_house.txt"));
        FileOutputFormat.setOutputPath(job, new Path("MapReduce/out/AcessHousePubTimeSort"));
        job.waitForCompletion(true);
    }
}

Mapper端：

public class AcessHousePubTimeSortMapper extends Mapper<Object, Text, Text, IntWritable> {
    private Text outk = new Text();
    private IntWritable outv = new IntWritable(1);
    @Override
    protected void map(Object key, Text value, Context context) throws IOException, InterruptedException {
        String lines = value.toString();
        String data[] = lines.split("\t");
        String crawler_time = data[9], followInfo = data[4];
        String ct = crawler_time.substring(0, 10);
        int idx1 = followInfo.indexOf("|"), idx2 = followInfo.indexOf("发");
        String timeStr = followInfo.substring(idx1 + 1, idx2);
        String pubDate = "";
        try {
            pubDate = getPubDate(ct, timeStr);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        outk.set(new Text(pubDate));
        context.write(outk, outv);
    }
    public String getPubDate(String ct, String timeStr) throws ParseException{
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        Date getTime = sdf.parse(ct);
        String getDate = sdf.format(getTime);
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(getTime);
        if (timeStr.equals("今天")) {
            calendar.add(Calendar.DAY_OF_WEEK,-0);
        } else if (timeStr.contains("天")) {
            int i = 0;
            while (Character.isDigit(timeStr.charAt(i))) i++;
            int size = Integer.parseInt(timeStr.substring(0, i));
            calendar.add(Calendar.DAY_OF_WEEK, -size);
        } else {
            int i = 0;
            while (Character.isDigit(timeStr.charAt(i))) i++; 
            int size = Integer.parseInt(timeStr.substring(0, i));
            calendar.add(Calendar.MONTH, -size);
        }
        Date pubTime = calendar.getTime();
        String pubDate = sdf.format(pubTime);
        return pubDate;
    }
}

Reducer端：

public class AcessHousePubTimeSortReducer extends Reducer<Text, IntWritable, Text, IntWritable> {
    @Override
    protected void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
        int sum = 0;
        for (IntWritable val : values) sum += val.get();
        context.write(key, new IntWritable(sum));
    }
}

• 运行情况：

• 结果：

1.4 统计二手房四大一线城市总价Top5

• 分析目的：

TopN是MapReduce分析最常见且必不可少的一个例子。

• 代码：

Driver端：

public class TotalPriceTop5ByCityDriver {
    public static void main(String[] args) throws Exception {
        args = new String[] {  "datas/tb_house.txt", "MapReduce/out/TotalPriceTop5ByCity" };
        Configuration conf = new Configuration();
        if (args.length != 2) {
            System.err.println("Usage: TotalPriceTop5ByCity <in> <out>");
            System.exit(2);
        }
        Job job = Job.getInstance(conf);
        job.setJarByClass(TotalPriceTop5ByCityDriver.class);
        job.setMapperClass(TotalPriceTop5ByCityMapper.class);
        job.setReducerClass(TotalPriceTop5ByCityReducer.class);
        job.setMapOutputKeyClass(Text.class);
        job.setMapOutputValueClass(IntWritable.class);
        job.setNumReduceTasks(1);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(Text.class);
        FileInputFormat.addInputPath(job, new Path(args[0]));
        FileOutputFormat.setOutputPath(job, new Path(args[1]));
        System.exit(job.waitForCompletion(true) ? 0 : 1);
    }
}

Mapper端：

public class TotalPriceTop5ByCityMapper extends Mapper<Object, Text, Text, IntWritable> {
    private int cnt = 1;
    private Text outk = new Text();
    private IntWritable outv = new IntWritable();
    @Override
    public void map(Object key, Text value, Context context) throws IOException, InterruptedException {
        String line = value.toString();
        String[] data = line.split("\t");
        String city = data[1], totalPrice = data[6];
        outk.set(data[1]);
        outv.set(Integer.parseInt(data[6]));
        context.write(outk, outv);
    }
}

Reducer端：

public class TotalPriceTop5ByCityReducer extends Reducer<Text, IntWritable, Text, Text> {
   private Text outv = new Text();
   private int len = 0;
    @Override
    protected void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
        List<Integer> totalPriceList = new ArrayList<Integer>();
        Iterator<IntWritable> iterator = values.iterator();
        while (iterator.hasNext()) {
            totalPriceList.add(iterator.next().get());
        }
        Collections.sort(totalPriceList);
        int size = totalPriceList.size();
        String top5Str = "二手房总价Top5：";
        for (int i = 1; i <= 5; i++) {
            if (i == 5) {
                top5Str += totalPriceList.get(size - i) + "万元";
            } else {
                top5Str += totalPriceList.get(size - i) + "万元, ";
            }
        }
        outv.set(String.valueOf(top5Str));
        context.write(key, outv);
    }
}

• 运行情况：

• 结果：

1.5 基于二手房总价实现自定义分区全排序

• 分析目的：

自定义分区全排序可以实现不同于以往的排序方式，展示效果与默认全排序可以体现出一定的差别。

• 代码：

public class TotalOrderingPartition extends Configured implements Tool {
    static class SimpleMapper extends Mapper<Object, Text, Text, IntWritable> {
        @Override
        protected void map(Object key, Text value, Context context) throws IOException, InterruptedException {
            IntWritable intWritable = new IntWritable(Integer.parseInt(key.toString()));
            context.write((Text) key, intWritable);
        }
    }
    static class SimpleReducer extends Reducer<Text, IntWritable, IntWritable, NullWritable> {
        @Override
        protected void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
            for (IntWritable value : values) {
                context.write(value, NullWritable.get());
            }
        }
    }
    @Override
    public int run(String[] args) throws Exception {
        Configuration conf = getConf();
        Job job = Job.getInstance(conf, "Total Order Sorting");
        job.setJarByClass(TotalOrderingPartition.class);
        job.setInputFormatClass(KeyValueTextInputFormat.class);
        FileInputFormat.addInputPath(job, new Path(args[0]));
        FileOutputFormat.setOutputPath(job, new Path(args[1]));
        job.setNumReduceTasks(3);
        job.setMapOutputKeyClass(Text.class);
        job.setMapOutputValueClass(IntWritable.class);
        job.setOutputKeyClass(IntWritable.class);
        job.setOutputValueClass(NullWritable.class);
        TotalOrderPartitioner.setPartitionFile(job.getConfiguration(), new Path(args[2]));
        InputSampler.Sampler<Text, Text> sampler = new InputSampler.SplitSampler<Text, Text>(5000, 10);
        InputSampler.writePartitionFile(job, sampler);
        job.setPartitionerClass(TotalOrderPartitioner.class);
        job.setMapperClass(SimpleMapper.class);
        job.setReducerClass(SimpleReducer.class);
        job.setJobName("TotalOrderingPartition");
        return job.waitForCompletion(true) ? 0 : 1;
    }
    public static void main(String[] args) throws Exception {
        args = new String[] { "datas/tb_house.txt", "MapReduce/out/TotalOrderingPartition/outPartition1", "MapReduce/out/TotalOrderingPartition/outPartition2" };
        int exitCode = ToolRunner.run(new TotalOrderingPartition(), args);
        System.exit(exitCode);
    }
}

• 运行情况：

• 结果：

…

…

…

1.6 基于建造年份和房子总价的二次排序

• 分析目的：

某些时候按照一个字段的排序方式并不能让我们满意，二次排则是解决这个问题的一个方法。

• 代码：

Driver端：

Mapper端：

Reducer端：

• 运行情况：

• 结果：

1.7 自定义类统计二手房地理位置对应数量

• 分析目的：

某些字段通过MapReduce不可以直接统计得到，这时采用自定义类的方式便可以做到。

• 代码：

自定义类：

public class HouseCntByPositionTopListBean implements Writable {
    private Text info;
    private IntWritable cnt;
    public Text getInfo() {
        return info;
    }
    public void setInfo(Text info) {
        this.info = info;
    }
    public IntWritable getCnt() {
        return cnt;
    }
    public void setCnt(IntWritable cnt) {
        this.cnt = cnt;
    }
    @Override
    public void readFields(DataInput in) throws IOException {
        this.cnt = new IntWritable(in.readInt());
    }
    @Override
    public void write(DataOutput out) throws IOException {
        out.writeInt(cnt.get());
    }
    @Override
    public String toString() {
        String infoStr = info.toString();
        int idx = infoStr.indexOf("-");
        String city = infoStr.substring(0, idx);
        String position = infoStr.substring(idx + 1);
        return city + "#" + "[" + position + "]" + "#" + cnt;
    }
}

Driver端：

Mapper端：

Reducer端：

• 运行情况：

• 结果：

1.8 统计二手房标签的各类比例

• 分析目的：

占比分析同样是MapReduce统计分析的一大常用方式。

• 代码：

Driver端：

public class TagRatioByCityDriver {
    public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
        args = new String[] {"datas/tb_house.txt", "MapReduce/out/TagRatioByCity" };
        Configuration conf = new Configuration();
        Job job = Job.getInstance(conf);
        job.setJarByClass(TagRatioByCityDriver.class);
        job.setMapOutputKeyClass(Text.class);
        job.setMapOutputValueClass(IntWritable.class);
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(Text.class);
        job.setMapperClass(TagRatioByCityMapper.class);
        job.setReducerClass(TagRatioByCityReducer.class);
        FileInputFormat.addInputPath(job, new Path(args[0]));
        FileOutputFormat.setOutputPath(job, new Path(args[1]));
        job.waitForCompletion(true);
    }
}

Mapper端：

public class TagRatioByCityMapper extends Mapper<Object, Text, Text, IntWritable> {
    private Text outk = new Text();
    private IntWritable outv = new IntWritable(1);
    @Override
    protected void map(Object key, Text value, Context context) throws IOException, InterruptedException {
        String line = value.toString();
        String[] data = line.split("\t");
        String city = data[1], tag = data[8];
        if ("".equals(tag))  tag = "未知标签";
        outk.set(city + "-" + tag);
        context.write(outk, outv);
    }
}

Reducer端：

public class TagRatioByCityReducer extends Reducer<Text, IntWritable, Text, Text> {
    private Text outv = new Text();
    private int sum = 0;
    @Override
    protected void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException {
        DecimalFormat df = new DecimalFormat("0.00");
        int cnt = 0;
        for (IntWritable value : values) {
            cnt += value.get();
        }
        String s = key.toString();
        String format = "";
        if (s.contains("上海")) {
            sum = 2995;
            format = df.format((double) cnt / sum * 100) + "%";
        } else if (s.contains("北京")) {
            sum = 2972;
            format = df.format((double) cnt / sum * 100) + "%";
        } else if (s.contains("广州")) {
            sum = 2699;
            format = df.format((double) cnt / sum * 100) + "%";
        } else {
            sum = 2982;
            format = df.format((double) cnt / sum * 100) + "%";
        }
        outv.set(format);
        context.write(key, outv);
    }
}

• 运行情况：

• 结果：

tp

2、数据及源代码

• Github

• Gitee

3、总结

MapReduce统计分析过程需要比较细心，「根据二手房信息发布时间排序统计」这个涉及到Java中日期类SimpleDateFormat和Date的使用，需要慢慢调试得出结果；统计最值和占比的难度并不高，主要在于统计要计算的类别的数量和总数量，最后二者相处即可；二次排序和自定义类难度较高，但一步一步来还是可以实现的。

结束！