org.apache.flink.runtime.fs.hdfs

Class DistributedFileSystem

java.lang.Object

org.apache.flink.core.fs.FileSystem

org.apache.flink.runtime.fs.hdfs.DistributedFileSystem

public final class DistributedFileSystem
extends FileSystem

Concrete implementation of the FileSystem base class for the Hadoop Distribution File System. The class is essentially a wrapper class which encapsulated the original Hadoop HDFS API.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.core.fs.FileSystem

FileSystem.FSKey, FileSystem.WriteMode

Constructor Summary

Constructors

Constructor and Description
DistributedFileSystem() Creates a new DistributedFileSystem object to access HDFS

Method Summary

Modifier and Type	Method and Description
FSDataOutputStream	create(Path f, boolean overwrite)
FSDataOutputStream	create(Path f, boolean overwrite, int bufferSize, short replication, long blockSize)
boolean	delete(Path f, boolean recursive)
long	getDefaultBlockSize()
BlockLocation[]	getFileBlockLocations(FileStatus file, long start, long len)
FileStatus	getFileStatus(Path f)
static org.apache.hadoop.conf.Configuration	getHadoopConfiguration() Returns a new Hadoop Configuration object using the path to the hadoop conf configured in the main configuration (flink-conf.yaml).
URI	getUri()
Path	getWorkingDirectory()
void	initialize(URI path)
boolean	isDistributedFS()
FileStatus[]	listStatus(Path f)
boolean	mkdirs(Path f)
FSDataInputStream	open(Path f)
FSDataInputStream	open(Path f, int bufferSize)
boolean	rename(Path src, Path dst)

Methods inherited from class org.apache.flink.core.fs.FileSystem

exists, get, getLocalFileSystem, getNumberOfBlocks, initOutPathDistFS, initOutPathLocalFS

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DistributedFileSystem

public DistributedFileSystem()
                      throws IOException

Creates a new DistributedFileSystem object to access HDFS

Throws:

IOException - throw if the required HDFS classes cannot be instantiated

Method Detail

getHadoopConfiguration

public static org.apache.hadoop.conf.Configuration getHadoopConfiguration()

Returns a new Hadoop Configuration object using the path to the hadoop conf configured in the main configuration (flink-conf.yaml). This method is public because its being used in the HadoopDataSource.

getWorkingDirectory

public Path getWorkingDirectory()

Specified by:

getWorkingDirectory in class FileSystem

getUri

public URI getUri()

Specified by:

getUri in class FileSystem

initialize

public void initialize(URI path)
                throws IOException

Specified by:

initialize in class FileSystem

Throws:

IOException

getFileStatus

public FileStatus getFileStatus(Path f)
                         throws IOException

Specified by:

getFileStatus in class FileSystem

Throws:

IOException

getFileBlockLocations

public BlockLocation[] getFileBlockLocations(FileStatus file,
                                             long start,
                                             long len)
                                      throws IOException

Specified by:

getFileBlockLocations in class FileSystem

Throws:

IOException

open

public FSDataInputStream open(Path f,
                              int bufferSize)
                       throws IOException

Specified by:

open in class FileSystem

Throws:

IOException

open

public FSDataInputStream open(Path f)
                       throws IOException

Specified by:

open in class FileSystem

Throws:

IOException

create

public FSDataOutputStream create(Path f,
                                 boolean overwrite,
                                 int bufferSize,
                                 short replication,
                                 long blockSize)
                          throws IOException

Specified by:

create in class FileSystem

Throws:

IOException

create

public FSDataOutputStream create(Path f,
                                 boolean overwrite)
                          throws IOException

Specified by:

create in class FileSystem

Throws:

IOException

delete

public boolean delete(Path f,
                      boolean recursive)
               throws IOException

Specified by:

delete in class FileSystem

Throws:

IOException

listStatus

public FileStatus[] listStatus(Path f)
                        throws IOException

Specified by:

listStatus in class FileSystem

Throws:

IOException

mkdirs

public boolean mkdirs(Path f)
               throws IOException

Specified by:

mkdirs in class FileSystem

Throws:

IOException

rename

public boolean rename(Path src,
                      Path dst)
               throws IOException

Specified by:

rename in class FileSystem

Throws:

IOException

getDefaultBlockSize

public long getDefaultBlockSize()

Overrides:

getDefaultBlockSize in class FileSystem

isDistributedFS

public boolean isDistributedFS()

Specified by:

isDistributedFS in class FileSystem