数据按列排序

我不是女神ヾ 2022-08-20 10:26 151阅读 0赞

**对一些有指定分隔符的数据，按照对应列数进行自定义排序**  
  
  
原始数据：

hadoop@sh-hadoop:more sourText.txt 
    hadoop|234|2346|sdfasdgadfgdfg
    spark|534|65745|fhsdfghdfgh
    hive|65|6585|shsfghfgh
    hbase|98|456|jhgjdfghj
    tachyon|345|567|sfhrtyhert
    kafka|455|567|dghrtyh
    storm|86|345|dgsdfg
    redis|45|56|ergerg
    sqoop|45|765|fghd
    flume|34|67|sdfgrty
    oozie|23|45|adfgdfg
    pig|54|456|dfg
    zookeeper|23|543|dfgd
    solr|75|54|ertgergt

**1、用Mr进行排序，按照第2列进行降序排序：**

hadoop@sh-hadoop:/home/hadoop/blb$ hdfs dfs -text /user/hadoop/libin/input/sourText.txt | wc -l
    14
    hadoop@sh-hadoop:/home/hadoop/blb$ hdfs dfs -text /user/hadoop/libin/Domain800_level2/merge1/out1/* | wc -l
    14
    hadoop@sh-hadoop:/home/hadoop/blb$ hdfs dfs -text /user/hadoop/libin/Domain800_level2/merge1/out1/* | more
    spark|534|65745|fhsdfghdfgh
    kafka|455|567|dghrtyh
    tachyon|345|567|sfhrtyhert
    hadoop|234|2346|sdfasdgadfgdfg
    hbase|98|456|jhgjdfghj
    storm|86|345|dgsdfg
    solr|75|54|ertgergt
    hive|65|6585|shsfghfgh
    pig|54|456|dfg
    redis|45|56|ergerg
    sqoop|45|765|fghd
    flume|34|67|sdfgrty
    oozie|23|45|adfgdfg
    zookeeper|23|543|dfgd
    hadoop@sh-hadoop:/home/hadoop/blb$

**2、用shell命令进行统计：**  
\-r:sort默认的排序方式是升序，如果想改成降序，加个-r就搞定了。  
\-n:就要使用-n选项，来告诉sort，“要以数值来排序”！  
\-t:sort提供了-t选项，后面可以设定间隔符。  
\-k:指定了间隔符之后，就可以用-k来指定列数了。

2.1、按照第二列进行降序排序：

**sort -t "|" -nrk2 sourText.txt **

hadoop@sh-hadoop:/home/hadoop/blb$ sort -t "|" -nrk2 sourText.txt 
    spark|534|65745|fhsdfghdfgh
    kafka|455|567|dghrtyh
    tachyon|345|567|sfhrtyhert
    hadoop|234|2346|sdfasdgadfgdfg
    hbase|98|456|jhgjdfghj
    storm|86|345|dgsdfg
    solr|75|54|ertgergt
    hive|65|6585|shsfghfgh
    pig|54|456|dfg
    sqoop|45|765|fghd
    redis|45|56|ergerg
    flume|34|67|sdfgrty
    zookeeper|23|543|dfgd
    oozie|23|45|adfgdfg

2.2、按照第三列进行降序排序：

hadoop@sh-hadoop:/home/hadoop/blb$ sort -t "|" -nrk3 sourText.txt 
    spark|534|65745|fhsdfghdfgh
    hive|65|6585|shsfghfgh
    hadoop|234|2346|sdfasdgadfgdfg
    sqoop|45|765|fghd
    tachyon|345|567|sfhrtyhert
    kafka|455|567|dghrtyh
    zookeeper|23|543|dfgd
    pig|54|456|dfg
    hbase|98|456|jhgjdfghj
    storm|86|345|dgsdfg
    flume|34|67|sdfgrty
    redis|45|56|ergerg
    solr|75|54|ertgergt
    oozie|23|45|adfgdfg

排序后倒入新文件中：

** sort -t "|" -nrk2 part-r-00000 |more > merge.txt**

附录：

MapReduce实现代码：

import java.io.DataInput;
    import java.io.DataOutput;
    import java.io.IOException;
    
    import org.apache.hadoop.conf.Configuration;
    import org.apache.hadoop.fs.Path;
    import org.apache.hadoop.io.LongWritable;
    import org.apache.hadoop.io.NullWritable;
    import org.apache.hadoop.io.Text;
    import org.apache.hadoop.io.WritableComparable;
    import org.apache.hadoop.mapreduce.Job;
    import org.apache.hadoop.mapreduce.Mapper;
    import org.apache.hadoop.mapreduce.Reducer;
    import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
    import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
    import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
    import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
    import org.apache.hadoop.util.GenericOptionsParser;
    
    import mapreduce.SegmentUtil;
    
    public class Domain_merge {
    	public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
    		Configuration conf = new Configuration();
    		String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
    		if (otherArgs.length != 2) {
    			System.err.println("Usage Domain800_level2 <input> <输出结果>");
    			System.exit(2);
    		}
    
    		Job job4 = Job.getInstance(conf, Domain_merge.class.getSimpleName());
    		job4.setJarByClass(Domain_merge.class);
    		job4.setMapOutputKeyClass(Toptaobao500.class);
    		job4.setMapOutputValueClass(Text.class);
    		job4.setOutputKeyClass(Text.class);
    		job4.setOutputValueClass(NullWritable.class);
    		//job4.setPartitionerClass(MyPartitioner.class);
    		job4.setMapperClass(MyMapper2.class);
    		job4.setNumReduceTasks(1);
    		job4.setReducerClass(MyReducer2.class);
    		job4.setInputFormatClass(TextInputFormat.class);
    		job4.setOutputFormatClass(TextOutputFormat.class);
    		FileInputFormat.addInputPath(job4, new Path(otherArgs[0]));
    		FileOutputFormat.setOutputPath(job4, new Path(otherArgs[1]));
    		job4.waitForCompletion(true);
    	}
    	/**
    	 * 第二个Job排序
    	 */
    	public static class MyMapper2 extends Mapper<LongWritable, Text, Toptaobao500, Text>{
    		Toptaobao500 mw=new Toptaobao500();
    		@Override
    		protected void map(LongWritable key, Text value,
    				Mapper<LongWritable, Text, Toptaobao500, Text>.Context context)
    						throws IOException, InterruptedException {
    			String[] spl=value.toString().split("\\|");
    			String trait=spl[0].trim();
    			String uv=spl[1].trim();
    			String pv=spl[2].trim();
    			String fenlei=spl[3].trim();
    			
    			mw.setkind(trait+"|"+uv+"|"+pv+"|"+fenlei);
    			mw.setCount(Long.parseLong(uv.trim()));
    			context.write(mw, new Text(value));
    		}
    	}
    	public static class MyReducer2 extends Reducer<Toptaobao500, Text, Text, NullWritable>{
    		@Override
    		protected void reduce(Toptaobao500 k4, Iterable<Text> v4s, Reducer<Toptaobao500, Text, Text, NullWritable>.Context context)
    				throws IOException, InterruptedException {
    			for (Text v4 : v4s) {
    				context.write(v4, NullWritable.get());
    			}
    		}
    	}
    	public static class Toptaobao500 implements WritableComparable<Toptaobao500> {
    		String kind;
    		Long count;
    
    		public Toptaobao500() {
    		}
    
    		public Toptaobao500(String kind, Long count) {
    			this.kind = kind;
    			this.count = count;
    		}
    
    		public void setkind(String kind) {
    			this.kind = kind;
    		}
    
    		public void setCount(Long l) {
    			this.count = l;
    		}
    
    		public String getKind() {
    			return this.kind;
    		}
    
    		public Long getCount() {
    			return this.count;
    		}
    
    		@Override
    		public void write(DataOutput out) throws IOException {
    			out.writeUTF(kind);
    			out.writeLong(count);
    		}
    
    		@Override
    		public void readFields(DataInput in) throws IOException {
    			this.kind = in.readUTF();
    			this.count = in.readLong();
    		}
    
    		@Override
    		public int compareTo(Toptaobao500 o) {
    			long temp=this.count-o.count;  
    	        if(temp>0){  
    	            temp=-1;  
    	            return (int) temp;  
    	        }else if(temp<0){  
    	            temp=1;  
    	            return (int) temp;  
    	        }  
    	        return (int) (this.count-o.count); 
    		}
    	    @Override  
    	    public boolean equals(Object obj) {  
    	        return super.equals(obj);  
    	    }  
    	    @Override  
    	    public int hashCode() {  
    	        return super.hashCode();  
    	    } 
    		@Override
    		public String toString() {
    			return this.kind;
    		}
    	}
    }