Package com.linkedin.davinci.client

Enum Class StorageClass

java.lang.Object

java.lang.Enum<StorageClass>

com.linkedin.davinci.client.StorageClass

All Implemented Interfaces:

Serializable, Comparable<StorageClass>, Constable

public enum StorageClass
extends Enum<StorageClass>

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
DISK	The mode has the following implications: 1.
MEMORY_BACKED_BY_DISK	The mode has the following implications: 1.

Method Summary

Modifier and Type	Method	Description
static StorageClass	valueOf(String name)	Returns the enum constant of this class with the specified name.
static StorageClass[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

DISK

public static final StorageClass DISK

The mode has the following implications: 1. Keep all the data on disk. 2. Use a block cache to keep the hottest entries and internally it is using LRU algorithm. Internally, Block Cache will try to cache index/bloom filters over data entries if there is a memory pressure. 3. Block cache size is configurable. 4. This mode is recommended for the large store use cases that the application doesn't have enough RAM to keep all the data in memory and the application is using SSD.

MEMORY_BACKED_BY_DISK

public static final StorageClass MEMORY_BACKED_BY_DISK

The mode has the following implications: 1. Keep a snapshot on disk. 2. Application can use SSD or Hard Drive. 3. Application needs to have enough RAM to keep DaVinci databases fully in RAM (ideally, it should have enough RAM to keep two versions since Venice/DaVinci database is versioned.) 4. At serving time, all the read request will be served out of memory and internally, RocksDB in DaVinci is using mmap to bring the on-disk data files into RAM.

Method Details

values

public static StorageClass[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static StorageClass valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum class has no constant with the specified name

NullPointerException - if the argument is null