org.apache.flink.contrib.streaming.state

枚举 PredefinedOptions

java.lang.Object

java.lang.Enum<PredefinedOptions>

org.apache.flink.contrib.streaming.state.PredefinedOptions

所有已实现的接口:

Serializable, Comparable<PredefinedOptions>

public enum PredefinedOptions
extends Enum<PredefinedOptions>

The PredefinedOptions are configuration settings for the RocksDBStateBackend. The various pre-defined choices are configurations that have been empirically determined to be beneficial for performance under different settings.

Some of these settings are based on experiments by the Flink community, some follow guides from the RocksDB project.

枚举常量概要

枚举常量

枚举常量和说明
DEFAULT Default options for all settings, except that writes are not forced to the disk.
FLASH_SSD_OPTIMIZED Pre-defined options for Flash SSDs.
SPINNING_DISK_OPTIMIZED Pre-defined options for regular spinning hard disks.
SPINNING_DISK_OPTIMIZED_HIGH_MEM Pre-defined options for better performance on regular spinning hard disks, at the cost of a higher memory consumption.

方法概要

限定符和类型	方法和说明
abstract org.rocksdb.ColumnFamilyOptions	createColumnOptions() Creates the ColumnFamilyOptionsfor this pre-defined setting.
abstract org.rocksdb.DBOptions	createDBOptions() Creates the DBOptionsfor this pre-defined setting.
static PredefinedOptions	valueOf(String name) 返回带有指定名称的该类型的枚举常量。
static PredefinedOptions[]	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

DEFAULT

public static final PredefinedOptions DEFAULT

Default options for all settings, except that writes are not forced to the disk.

Note: Because Flink does not rely on RocksDB data on disk for recovery, there is no need to sync data to stable storage.

SPINNING_DISK_OPTIMIZED

public static final PredefinedOptions SPINNING_DISK_OPTIMIZED

Pre-defined options for regular spinning hard disks.

This constant configures RocksDB with some options that lead empirically to better performance when the machines executing the system use regular spinning hard disks.

The following options are set:

• setCompactionStyle(CompactionStyle.LEVEL)
• setLevelCompactionDynamicLevelBytes(true)
• setIncreaseParallelism(4)
• setUseFsync(false)
• setDisableDataSync(true)
• setMaxOpenFiles(-1)

Note: Because Flink does not rely on RocksDB data on disk for recovery, there is no need to sync data to stable storage.

SPINNING_DISK_OPTIMIZED_HIGH_MEM

public static final PredefinedOptions SPINNING_DISK_OPTIMIZED_HIGH_MEM

Pre-defined options for better performance on regular spinning hard disks, at the cost of a higher memory consumption.

NOTE: These settings will cause RocksDB to consume a lot of memory for block caching and compactions. If you experience out-of-memory problems related to, RocksDB, consider switching back to SPINNING_DISK_OPTIMIZED.

The following options are set:

• setLevelCompactionDynamicLevelBytes(true)
• setTargetFileSizeBase(256 MBytes)
• setMaxBytesForLevelBase(1 GByte)
• setWriteBufferSize(64 MBytes)
• setIncreaseParallelism(4)
• setMinWriteBufferNumberToMerge(3)
• setMaxWriteBufferNumber(4)
• setUseFsync(false)
• setMaxOpenFiles(-1)
• BlockBasedTableConfig.setBlockCacheSize(256 MBytes)
• BlockBasedTableConfigsetBlockSize(128 KBytes)

Note: Because Flink does not rely on RocksDB data on disk for recovery, there is no need to sync data to stable storage.

FLASH_SSD_OPTIMIZED

public static final PredefinedOptions FLASH_SSD_OPTIMIZED

Pre-defined options for Flash SSDs.

This constant configures RocksDB with some options that lead empirically to better performance when the machines executing the system use SSDs.

The following options are set:

• setIncreaseParallelism(4)
• setUseFsync(false)
• setDisableDataSync(true)
• setMaxOpenFiles(-1)

Note: Because Flink does not rely on RocksDB data on disk for recovery, there is no need to sync data to stable storage.

方法详细资料

values

public static PredefinedOptions[] 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 (PredefinedOptions c : PredefinedOptions.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 PredefinedOptions valueOf(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:

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

NullPointerException - 如果参数为空值

createDBOptions

public abstract org.rocksdb.DBOptions createDBOptions()

Creates the DBOptionsfor this pre-defined setting.

返回:

The pre-defined options object.

createColumnOptions

public abstract org.rocksdb.ColumnFamilyOptions createColumnOptions()

Creates the ColumnFamilyOptionsfor this pre-defined setting.

返回:

The pre-defined options object.