org.rocksdb

类 HashSkipListMemTableConfig

java.lang.Object

org.rocksdb.MemTableConfig

org.rocksdb.HashSkipListMemTableConfig

public class HashSkipListMemTableConfig
extends MemTableConfig

The config for hash skip-list mem-table representation. Such mem-table representation contains a fix-sized array of buckets, where each bucket points to a skiplist (or null if the bucket is empty).

Note that since this mem-table representation relies on the key prefix, it is required to invoke one of the usePrefixExtractor functions to specify how to extract key prefix given a key. If proper prefix-extractor is not set, then RocksDB will use the default memtable representation (SkipList) instead and post a warning in the LOG.

字段概要

字段

限定符和类型	字段和说明
static int	DEFAULT_BRANCHING_FACTOR
static int	DEFAULT_BUCKET_COUNT
static int	DEFAULT_HEIGHT

构造器概要

构造器

构造器和说明
HashSkipListMemTableConfig() HashSkipListMemTableConfig constructor

方法概要

限定符和类型	方法和说明
int	branchingFactor()
long	bucketCount()
int	height()
protected long	newMemTableFactoryHandle() This function should only be called by Options.setMemTableConfig(), which will create a c++ shared-pointer to the c++ MemTableRepFactory that associated with the Java MemTableConfig.
HashSkipListMemTableConfig	setBranchingFactor(int bf) Set the branching factor used in the hash skip-list memtable.
HashSkipListMemTableConfig	setBucketCount(long count) Set the number of hash buckets used in the hash skiplist memtable.
HashSkipListMemTableConfig	setHeight(int height) Set the height of the skip list.

从类继承的方法 java.lang.Object

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

字段详细资料

DEFAULT_BUCKET_COUNT

public static final int DEFAULT_BUCKET_COUNT

另请参阅:

常量字段值

DEFAULT_BRANCHING_FACTOR

public static final int DEFAULT_BRANCHING_FACTOR

另请参阅:

常量字段值

DEFAULT_HEIGHT

public static final int DEFAULT_HEIGHT

另请参阅:

常量字段值

构造器详细资料

HashSkipListMemTableConfig

public HashSkipListMemTableConfig()

HashSkipListMemTableConfig constructor

方法详细资料

setBucketCount

public HashSkipListMemTableConfig setBucketCount(long count)

Set the number of hash buckets used in the hash skiplist memtable. Default = 1000000.

参数:

count - the number of hash buckets used in the hash skiplist memtable.

返回:

the reference to the current HashSkipListMemTableConfig.

bucketCount

public long bucketCount()

返回:

the number of hash buckets

setHeight

public HashSkipListMemTableConfig setHeight(int height)

Set the height of the skip list. Default = 4.

参数:

height - height to set.

返回:

the reference to the current HashSkipListMemTableConfig.

height

public int height()

返回:

the height of the skip list.

setBranchingFactor

public HashSkipListMemTableConfig setBranchingFactor(int bf)

Set the branching factor used in the hash skip-list memtable. This factor controls the probabilistic size ratio between adjacent links in the skip list.

参数:

bf - the probabilistic size ratio between adjacent link lists in the skip list.

返回:

the reference to the current HashSkipListMemTableConfig.

branchingFactor

public int branchingFactor()

返回:

branching factor, the probabilistic size ratio between adjacent links in the skip list.

newMemTableFactoryHandle

protected long newMemTableFactoryHandle()

从类复制的说明: MemTableConfig

This function should only be called by Options.setMemTableConfig(), which will create a c++ shared-pointer to the c++ MemTableRepFactory that associated with the Java MemTableConfig.

指定者:

newMemTableFactoryHandle 在类中 MemTableConfig

返回:

native handle address to native memory table instance.

另请参阅:

Options.setMemTableConfig(MemTableConfig)