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 <inputpath> <outputpath>");
}
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<LongWritable, Text, Text, NullWritable>{
@Override
protected void map(LongWritable key, Text value, Mapper<LongWritable, Text, Text, NullWritable>.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<? extends FileStatus> 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