Hadoop的FileStatus简单使用

Hadoop的FileStatus简单使用

FileStatus类继承关系：



FileStatus类的属性和方法：




输入文件信息：

blb@hadoop1:/home/blb/blb$ hdfs dfs -text /user/blb/libin/input/inputpath1.txt
hadoop  a
spark   a
hive    a
hbase   a
tachyon a
storm   a
redis   a
blb@hadoop1:/home/blb/blb$ 

代码：

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
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;


public class GetStatusMapReduce {
	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 databaseV1  ");
		}
		conf.set("path", otherArgs[0]);
		
		Job job = Job.getInstance(conf, GetStatusMapReduce.class.getSimpleName() + "1");
		job.setJarByClass(GetStatusMapReduce.class);
		job.setMapOutputKeyClass(Text.class);
		job.setMapOutputValueClass(Text.class);
		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(NullWritable.class);
		job.setMapperClass(MyMapper1.class);
		job.setNumReduceTasks(0);
		job.setInputFormatClass(TextInputFormat.class);
		job.setOutputFormatClass(TextOutputFormat.class);
		FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
		FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
		job.waitForCompletion(true);
	}
	public static class MyMapper1 extends Mapper{
		@Override
		protected void map(LongWritable key, Text value, Mapper.Context context)
				throws IOException, InterruptedException {
			FileSystem fileSystem=FileSystem.get(context.getConfiguration());
			FileStatus[] fileStatus=fileSystem.listStatus(new Path(context.getConfiguration().get("path")));
			int length = fileStatus.length;
			context.write(new Text("==================== 一次map函数 =============================="), NullWritable.get());
			context.write(new Text("length--"+length), NullWritable.get());
			for (FileStatus fs : fileStatus) {
				long accessTime = fs.getAccessTime(); 
				long blockSize = fs.getBlockSize();
				Class class1 = fs.getClass();
				String group = fs.getGroup();
				long len = fs.getLen();
				long modificationTime = fs.getModificationTime();
				String owner = fs.getOwner();
				Path path = fs.getPath();
				FsPermission permission = fs.getPermission();
				short replication = fs.getReplication();
				//Path symlink = fs.getSymlink();
				String string = fs.toString();
				boolean directory = fs.isDirectory();
				boolean encrypted = fs.isEncrypted();
				boolean file = fs.isFile();
				
				context.write(new Text("===================================================================================="), NullWritable.get());
				context.write(new Text("accessTime--"+accessTime), NullWritable.get());
				context.write(new Text("blockSize--"+blockSize), NullWritable.get());
				context.write(new Text("class1--"+class1), NullWritable.get());
				context.write(new Text("group--"+group), NullWritable.get());
				context.write(new Text("len--"+len), NullWritable.get());
				context.write(new Text("modificationTime--"+modificationTime), NullWritable.get());
				context.write(new Text("owner--"+owner), NullWritable.get());
				context.write(new Text("path--"+path), NullWritable.get());
				context.write(new Text("permission--"+permission), NullWritable.get());
				context.write(new Text("replication--"+replication), NullWritable.get());
				//context.write(new Text("symlink--"+symlink), NullWritable.get());
				context.write(new Text("string--"+string), NullWritable.get());
				context.write(new Text("directory--"+directory), NullWritable.get());
				context.write(new Text("encrypted--"+encrypted), NullWritable.get());
				context.write(new Text("file--"+file), NullWritable.get());
			}
		}
	}
}

输出：

==================== 一次map函数 ==============================
length--1
====================================================================================
accessTime--1459406433657
blockSize--268435456
class1--class org.apache.hadoop.fs.FileStatus
group--hadoop
len--58
modificationTime--1456301571884
owner--blb
path--hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt
permission--rw-r--r--
replication--2
string--FileStatus{path=hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt; isDirectory=false; length=58; replication=2; blocksize=268435456; modification_time=1456301571884; access_time=1459406433657; owner=blb; group=hadoop; permission=rw-r--r--; isSymlink=false}
directory--false
encrypted--false
file--true
==================== 一次map函数 ==============================
length--1
====================================================================================
accessTime--1459406433657
blockSize--268435456
class1--class org.apache.hadoop.fs.FileStatus
group--hadoop
len--58
modificationTime--1456301571884
owner--blb
path--hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt
permission--rw-r--r--
replication--2
string--FileStatus{path=hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt; isDirectory=false; length=58; replication=2; blocksize=268435456; modification_time=1456301571884; access_time=1459406433657; owner=blb; group=hadoop; permission=rw-r--r--; isSymlink=false}
directory--false
encrypted--false
file--true
==================== 一次map函数 ==============================
length--1
====================================================================================
accessTime--1459406433657
blockSize--268435456
class1--class org.apache.hadoop.fs.FileStatus
group--hadoop
len--58
modificationTime--1456301571884
owner--blb
path--hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt
permission--rw-r--r--
replication--2
string--FileStatus{path=hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt; isDirectory=false; length=58; replication=2; blocksize=268435456; modification_time=1456301571884; access_time=1459406433657; owner=blb; group=hadoop; permission=rw-r--r--; isSymlink=false}
directory--false
encrypted--false
file--true
==================== 一次map函数 ==============================
length--1
====================================================================================
accessTime--1459406433657
blockSize--268435456
class1--class org.apache.hadoop.fs.FileStatus
group--hadoop
len--58
modificationTime--1456301571884
owner--blb
path--hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt
permission--rw-r--r--
replication--2
string--FileStatus{path=hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt; isDirectory=false; length=58; replication=2; blocksize=268435456; modification_time=1456301571884; access_time=1459406433657; owner=blb; group=hadoop; permission=rw-r--r--; isSymlink=false}
directory--false
encrypted--false
file--true
==================== 一次map函数 ==============================
length--1
====================================================================================
accessTime--1459406433657
blockSize--268435456
class1--class org.apache.hadoop.fs.FileStatus
group--hadoop
len--58
modificationTime--1456301571884
owner--blb
path--hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt
permission--rw-r--r--
replication--2
string--FileStatus{path=hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt; isDirectory=false; length=58; replication=2; blocksize=268435456; modification_time=1456301571884; access_time=1459406433657; owner=blb; group=hadoop; permission=rw-r--r--; isSymlink=false}
directory--false
encrypted--false
file--true
==================== 一次map函数 ==============================
length--1
====================================================================================
accessTime--1459406433657
blockSize--268435456
class1--class org.apache.hadoop.fs.FileStatus
group--hadoop
len--58
modificationTime--1456301571884
owner--blb
path--hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt
permission--rw-r--r--
replication--2
string--FileStatus{path=hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt; isDirectory=false; length=58; replication=2; blocksize=268435456; modification_time=1456301571884; access_time=1459406433657; owner=blb; group=hadoop; permission=rw-r--r--; isSymlink=false}
directory--false
encrypted--false
file--true
==================== 一次map函数 ==============================
length--1
====================================================================================
accessTime--1459406433657
blockSize--268435456
class1--class org.apache.hadoop.fs.FileStatus
group--hadoop
len--58
modificationTime--1456301571884
owner--blb
path--hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt
permission--rw-r--r--
replication--2
string--FileStatus{path=hdfs://hadoop1:9000/user/blb/libin/input/inputpath1.txt; isDirectory=false; length=58; replication=2; blocksize=268435456; modification_time=1456301571884; access_time=1459406433657; owner=blb; group=hadoop; permission=rw-r--r--; isSymlink=false}
directory--false
encrypted--false
file--true