public abstract class DfsOutputStream extends OutputStream
| Constructor and Description |
|---|
DfsOutputStream() |
| Modifier and Type | Method and Description |
|---|---|
int |
blockSize()
Get the recommended alignment for writing.
|
abstract int |
read(long position,
ByteBuffer buf)
Read back a portion of already written data.
|
abstract void |
write(byte[] buf,
int off,
int len) |
void |
write(int b) |
close, flush, writepublic int blockSize()
Starting a write at multiples of the blockSize is more efficient than starting a write at any other position. If 0 or -1 the channel does not have any specific block size recommendation.
Channels should not recommend large block sizes. Sizes up to 1-4 MiB may be reasonable, but sizes above that may be horribly inefficient.
public void write(int b)
throws IOException
write in class OutputStreamIOExceptionpublic abstract void write(byte[] buf,
int off,
int len)
throws IOException
write in class OutputStreamIOExceptionpublic abstract int read(long position,
ByteBuffer buf)
throws IOException
The writing position of the output stream is not affected by a read.
position - offset to read from.buf - buffer to populate. Up to buf.remaining() bytes will
be read from position.IOException - reading is not supported, or the read cannot be performed due
to DFS errors.Copyright © 2014. All rights reserved.