Package org.apache.flink.runtime.io.network.buffer

Class BufferCompressor

java.lang.Object

org.apache.flink.runtime.io.network.buffer.BufferCompressor

public class BufferCompressor
extends Object

Compressor for Buffer.

Constructor Summary

Constructors

Constructor	Description
BufferCompressor(int bufferSize, org.apache.flink.configuration.NettyShuffleEnvironmentOptions.CompressionCodec factoryName)

Method Summary

Modifier and Type	Method	Description
Buffer	compressToIntermediateBuffer(Buffer buffer)	Compresses the given Buffer using BlockCompressor.
Buffer	compressToOriginalBuffer(Buffer buffer)	The difference between this method and compressToIntermediateBuffer(Buffer) is that this method will copy the compressed data back to the input Buffer starting from offset 0.

Methods inherited from class java.lang.Object

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

Constructor Details

BufferCompressor

public BufferCompressor(int bufferSize,
 org.apache.flink.configuration.NettyShuffleEnvironmentOptions.CompressionCodec factoryName)

Method Details

compressToIntermediateBuffer

public Buffer compressToIntermediateBuffer(Buffer buffer)

Compresses the given Buffer using BlockCompressor. The compressed data will be stored in the intermediate buffer of this BufferCompressor and returned to the caller. The caller must guarantee that the returned Buffer has been freed when calling the method next time.

Notes that the compression will always start from offset 0 to the size of the input Buffer.

compressToOriginalBuffer

public Buffer compressToOriginalBuffer(Buffer buffer)

The difference between this method and compressToIntermediateBuffer(Buffer) is that this method will copy the compressed data back to the input Buffer starting from offset 0.

The caller must guarantee that the input Buffer is writable.