org.rocksdb

Class CompressionOptions

java.lang.Object

org.rocksdb.AbstractNativeReference

org.rocksdb.AbstractImmutableNativeReference

org.rocksdb.RocksObject

org.rocksdb.CompressionOptions

All Implemented Interfaces:

java.lang.AutoCloseable

public class CompressionOptions
extends RocksObject

Options for Compression

Field Summary

Fields inherited from class org.rocksdb.RocksObject

nativeHandle_

Constructor Summary

Constructors

Constructor and Description
CompressionOptions()

Method Summary

Methods

Modifier and Type	Method and Description
protected void	disposeInternal(long handle)
int	level()
int	maxDictBytes() Maximum size of dictionary used to prime the compression library.
CompressionOptions	setLevel(int level)
CompressionOptions	setMaxDictBytes(int maxDictBytes) Maximum size of dictionary used to prime the compression library.
CompressionOptions	setStrategy(int strategy)
CompressionOptions	setWindowBits(int windowBits)
int	strategy()
int	windowBits()

Methods inherited from class org.rocksdb.RocksObject

disposeInternal

Methods inherited from class org.rocksdb.AbstractImmutableNativeReference

close, disOwnNativeHandle, isOwningHandle

Methods inherited from class org.rocksdb.AbstractNativeReference

dispose, finalize

Methods inherited from class java.lang.Object

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

Constructor Detail

CompressionOptions

public CompressionOptions()

Method Detail

setWindowBits

public CompressionOptions setWindowBits(int windowBits)

windowBits

public int windowBits()

setLevel

public CompressionOptions setLevel(int level)

level

public int level()

setStrategy

public CompressionOptions setStrategy(int strategy)

strategy

public int strategy()

setMaxDictBytes

public CompressionOptions setMaxDictBytes(int maxDictBytes)

Maximum size of dictionary used to prime the compression library. Currently this dictionary will be constructed by sampling the first output file in a subcompaction when the target level is bottommost. This dictionary will be loaded into the compression library before compressing/uncompressing each data block of subsequent files in the subcompaction. Effectively, this improves compression ratios when there are repetitions across data blocks. A value of 0 indicates the feature is disabled. Default: 0.

Parameters:

maxDictBytes - Maximum bytes to use for the dictionary

Returns:

the reference to the current options

maxDictBytes

public int maxDictBytes()

Maximum size of dictionary used to prime the compression library.

Returns:

The maximum bytes to use for the dictionary

disposeInternal

protected final void disposeInternal(long handle)

Specified by:

disposeInternal in class RocksObject