org.apache.hadoop.fs.cosn

Class CosNInputStream

java.lang.Object

java.io.InputStream

org.apache.hadoop.fs.FSInputStream

org.apache.hadoop.fs.cosn.CosNInputStream

All Implemented Interfaces:

Closeable, AutoCloseable, org.apache.hadoop.fs.PositionedReadable, org.apache.hadoop.fs.Seekable

public class CosNInputStream
extends org.apache.hadoop.fs.FSInputStream

The input stream for the COS blob store. Optimized sequential read flow based on a forward read-ahead queue

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CosNInputStream.ReadBuffer This class is used by CosNInputStream and CosNFileReadTask to buffer data that read from COS blob store.

Constructor Summary

Constructors

Constructor and Description
CosNInputStream(org.apache.hadoop.conf.Configuration conf, org.apache.hadoop.fs.cosn.NativeFileSystemStore store, org.apache.hadoop.fs.FileSystem.Statistics statistics, String key, long fileSize, ExecutorService readAheadExecutorService)

Method Summary

Modifier and Type	Method and Description
int	available()
void	close()
long	getPos()
int	read()
int	read(byte[] b, int off, int len)
void	seek(long pos)
boolean	seekToNewSource(long targetPos)

Methods inherited from class org.apache.hadoop.fs.FSInputStream

read, readFully, readFully, toString, validatePositionedReadArgs

Methods inherited from class java.io.InputStream

mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

CosNInputStream

public CosNInputStream(org.apache.hadoop.conf.Configuration conf,
                       org.apache.hadoop.fs.cosn.NativeFileSystemStore store,
                       org.apache.hadoop.fs.FileSystem.Statistics statistics,
                       String key,
                       long fileSize,
                       ExecutorService readAheadExecutorService)

Method Detail

seek

public void seek(long pos)
          throws IOException

Specified by:

seek in interface org.apache.hadoop.fs.Seekable

Specified by:

seek in class org.apache.hadoop.fs.FSInputStream

Throws:

IOException

getPos

public long getPos()

Specified by:

getPos in interface org.apache.hadoop.fs.Seekable

Specified by:

getPos in class org.apache.hadoop.fs.FSInputStream

seekToNewSource

public boolean seekToNewSource(long targetPos)

Specified by:

seekToNewSource in interface org.apache.hadoop.fs.Seekable

Specified by:

seekToNewSource in class org.apache.hadoop.fs.FSInputStream

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

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

Overrides:

read in class InputStream

Throws:

IOException

available

public int available()
              throws IOException

Overrides:

available in class InputStream

Throws:

IOException

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class InputStream