org.rocksdb

枚举 CompactionStyle

java.lang.Object

java.lang.Enum<CompactionStyle>

org.rocksdb.CompactionStyle

所有已实现的接口:

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

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

Enum CompactionStyle

RocksDB supports different styles of compaction. Available compaction styles can be chosen using this enumeration.

1. LEVEL - Level based Compaction style
2. UNIVERSAL - Universal Compaction Style is a compaction style, targeting the use cases requiring lower write amplification, trading off read amplification and space amplification.
3. FIFO - FIFO compaction style is the simplest compaction strategy. It is suited for keeping event log data with very low overhead (query log for example). It periodically deletes the old data, so it's basically a TTL compaction style.
4. NONE - Disable background compaction. Compaction jobs are submitted RocksDB.compactFiles(CompactionOptions, ColumnFamilyHandle, List, int, int, CompactionJobInfo) ()}.

另请参阅:

Universal Compaction, FIFO Compaction

枚举常量概要

枚举常量

枚举常量和说明
FIFO
LEVEL
NONE
UNIVERSAL

方法概要

限定符和类型	方法和说明
byte	getValue() Get the internal representation value.
static CompactionStyle	valueOf(java.lang.String name) 返回带有指定名称的该类型的枚举常量。
static CompactionStyle[]	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

LEVEL

public static final CompactionStyle LEVEL

UNIVERSAL

public static final CompactionStyle UNIVERSAL

FIFO

public static final CompactionStyle FIFO

NONE

public static final CompactionStyle NONE

方法详细资料

values

public static CompactionStyle[] 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 (CompactionStyle c : CompactionStyle.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 CompactionStyle 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

getValue

public byte getValue()

Get the internal representation value.

返回:

the internal representation value.