alluxio.client.block.stream

Class UfsFallbackLocalFileDataWriter

java.lang.Object

alluxio.client.block.stream.UfsFallbackLocalFileDataWriter

All Implemented Interfaces:

DataWriter, Cancelable, Closeable, AutoCloseable

@NotThreadSafe
public final class UfsFallbackLocalFileDataWriter
extends Object
implements DataWriter

A data writer that writes to local first and fallback to UFS block writes when the block storage on this local worker is full.

Nested Class Summary

Nested classes/interfaces inherited from interface alluxio.client.block.stream.DataWriter

DataWriter.Factory

Method Summary

Modifier and Type	Method and Description
void	cancel() Cancels an operation.
int	chunkSize()
void	close()
static UfsFallbackLocalFileDataWriter	create(FileSystemContext context, WorkerNetAddress address, long blockId, long blockSize, OutStreamOptions options)
void	flush() Flushes all the pending chunks.
Optional<String>	getUfsContentHash()
long	pos()
void	writeChunk(io.netty.buffer.ByteBuf chunk) Writes a chunk.

Methods inherited from class java.lang.Object

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

Method Detail

create

public static UfsFallbackLocalFileDataWriter create(FileSystemContext context,
                                                    WorkerNetAddress address,
                                                    long blockId,
                                                    long blockSize,
                                                    OutStreamOptions options)
                                             throws IOException

Parameters:

context - the file system context

address - the worker network address

blockId - the block ID

blockSize - the block size

options - the output stream options

Returns:

the UfsFallbackLocalFileDataWriter instance created

Throws:

IOException

getUfsContentHash

public Optional<String> getUfsContentHash()

Specified by:

getUfsContentHash in interface DataWriter

Returns:

the content hash of the file if it is written to the UFS. Will only return a non-empty value after the data writer has been closed.

writeChunk

public void writeChunk(io.netty.buffer.ByteBuf chunk)
                throws IOException

Description copied from interface: DataWriter

Writes a chunk. This method takes the ownership of this chunk even if it fails to write the chunk.

Specified by:

writeChunk in interface DataWriter

Parameters:

chunk - the chunk

Throws:

IOException

flush

public void flush()
           throws IOException

Description copied from interface: DataWriter

Flushes all the pending chunks.

Specified by:

flush in interface DataWriter

Throws:

IOException

chunkSize

public int chunkSize()

Specified by:

chunkSize in interface DataWriter

Returns:

the chunk size in bytes used

pos

public long pos()

Specified by:

pos in interface DataWriter

Returns:

the current pos which is the same as the totally number of bytes written so far

cancel

public void cancel()
            throws IOException

Description copied from interface: Cancelable

Cancels an operation.

Specified by:

cancel in interface Cancelable

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Throws:

IOException