alluxio.underfs.hdfs

Class HdfsUnderFileOutputStream

java.lang.Object

java.io.OutputStream

alluxio.underfs.hdfs.HdfsUnderFileOutputStream

All Implemented Interfaces:

ContentHashable, Closeable, Flushable, AutoCloseable

@NotThreadSafe
public class HdfsUnderFileOutputStream
extends OutputStream
implements ContentHashable

Output stream implementation for HdfsUnderFileSystem. This class is just a wrapper on top of an underlying FSDataOutputStream, except all calls to flush() will be converted to FSDataOutputStream#sync(). This is currently safe because all invocations of flush intend the functionality to be sync.

Constructor Summary

Constructors

Constructor and Description
HdfsUnderFileOutputStream(org.apache.hadoop.fs.FileSystem fs, String path, org.apache.hadoop.fs.FSDataOutputStream out) Basic constructor.

Method Summary

Modifier and Type	Method and Description
void	close()
void	flush()
Optional<String>	getContentHash()
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)

Methods inherited from class java.lang.Object

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

Constructor Detail

HdfsUnderFileOutputStream

public HdfsUnderFileOutputStream(org.apache.hadoop.fs.FileSystem fs,
                                 String path,
                                 org.apache.hadoop.fs.FSDataOutputStream out)

Basic constructor.

Parameters:

fs - the hdfs file system object

path - the path being written

out - underlying stream to wrap

Method Detail

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class OutputStream

Throws:

IOException

flush

public void flush()
           throws IOException

Specified by:

flush in interface Flushable

Overrides:

flush in class OutputStream

Throws:

IOException

write

public void write(int b)
           throws IOException

Specified by:

write in class OutputStream

Throws:

IOException

write

public void write(byte[] b)
           throws IOException

Overrides:

write in class OutputStream

Throws:

IOException

write

public void write(byte[] b,
                  int off,
                  int len)
           throws IOException

Overrides:

write in class OutputStream

Throws:

IOException

getContentHash

public Optional<String> getContentHash()
                                throws IOException

Specified by:

getContentHash in interface ContentHashable

Returns:

the content hash of the file written to the UFS if available after the stream has been closed

Throws:

IOException