org.rocksdb

枚举 PrepopulateBlobCache

java.lang.Object

java.lang.Enum<PrepopulateBlobCache>

org.rocksdb.PrepopulateBlobCache

所有已实现的接口:

java.io.Serializable, java.lang.Comparable<PrepopulateBlobCache>

public enum PrepopulateBlobCache
extends java.lang.Enum<PrepopulateBlobCache>

Enum PrepopulateBlobCache

Prepopulate warm/hot blobs which are already in memory into blob cache at the time of flush. On a flush, the blob that is in memory (in memtables) get flushed to the device. If using Direct IO, additional IO is incurred to read this blob back into memory again, which is avoided by enabling this option. This further helps if the workload exhibits high temporal locality, where most of the reads go to recently written data. This also helps in case of the remote file system since it involves network traffic and higher latencies.

枚举常量概要

枚举常量

枚举常量和说明
PREPOPULATE_BLOB_DISABLE
PREPOPULATE_BLOB_FLUSH_ONLY

方法概要

限定符和类型	方法和说明
java.lang.String	getLibraryName() Returns the library name of the prepopulate blob cache mode identified by the enumeration value.
static PrepopulateBlobCache	getPrepopulateBlobCache(byte byteIdentifier) Get the PrepopulateBlobCache enumeration value by passing the byte identifier to this method.
static PrepopulateBlobCache	getPrepopulateBlobCache(java.lang.String libraryName) Get the PrepopulateBlobCache enumeration value by passing the library name to this method.
byte	getValue() Returns the byte value of the enumerations value.
static PrepopulateBlobCache	valueOf(java.lang.String name) 返回带有指定名称的该类型的枚举常量。
static PrepopulateBlobCache[]	values() 按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。

从类继承的方法 java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

从类继承的方法 java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

枚举常量详细资料

PREPOPULATE_BLOB_DISABLE

public static final PrepopulateBlobCache PREPOPULATE_BLOB_DISABLE

PREPOPULATE_BLOB_FLUSH_ONLY

public static final PrepopulateBlobCache PREPOPULATE_BLOB_FLUSH_ONLY

方法详细资料

values

public static PrepopulateBlobCache[] values()

按照声明该枚举类型的常量的顺序, 返回 包含这些常量的数组。该方法可用于迭代 常量, 如下所示:

for (PrepopulateBlobCache c : PrepopulateBlobCache.values())
    System.out.println(c);

返回:

按照声明该枚举类型的常量的顺序返回的包含这些常量的数组

valueOf

public static PrepopulateBlobCache valueOf(java.lang.String name)

返回带有指定名称的该类型的枚举常量。 字符串必须与用于声明该类型的枚举常量的 标识符完全匹配。(不允许有多余 的空格字符。)

参数:

name - 要返回的枚举常量的名称。

返回:

返回带有指定名称的枚举常量

抛出:

java.lang.IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量

java.lang.NullPointerException - 如果参数为空值

getPrepopulateBlobCache

public static PrepopulateBlobCache getPrepopulateBlobCache(java.lang.String libraryName)

Get the PrepopulateBlobCache enumeration value by passing the library name to this method.

If library cannot be found the enumeration value PREPOPULATE_BLOB_DISABLE will be returned.

参数:

libraryName - prepopulate blob cache library name.

返回:

PrepopulateBlobCache instance.

getPrepopulateBlobCache

public static PrepopulateBlobCache getPrepopulateBlobCache(byte byteIdentifier)

Get the PrepopulateBlobCache enumeration value by passing the byte identifier to this method.

参数:

byteIdentifier - of PrepopulateBlobCache.

返回:

PrepopulateBlobCache instance.

抛出:

java.lang.IllegalArgumentException - If PrepopulateBlobCache cannot be found for the provided byteIdentifier

getValue

public byte getValue()

Returns the byte value of the enumerations value.

返回:

byte representation

getLibraryName

public java.lang.String getLibraryName()

Returns the library name of the prepopulate blob cache mode identified by the enumeration value.

返回:

library name