alluxio.client.file.cache

Enum ShadowCacheType

java.lang.Object

java.lang.Enum<ShadowCacheType>

alluxio.client.file.cache.ShadowCacheType

All Implemented Interfaces:

Serializable, Comparable<ShadowCacheType>

public enum ShadowCacheType
extends Enum<ShadowCacheType>

This represents the different shadow cache implementations that can be instantiated.

Enum Constant Summary

Enum Constants

Enum Constant and Description
CLOCK_CUCKOO_FILTER A shadow cache with clock cuckoo filter implementation.
MULTIPLE_BLOOM_FILTER A shadow cache with multiple bloom filter implementation.

Method Summary

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

Methods inherited from class java.lang.Enum

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

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

MULTIPLE_BLOOM_FILTER

public static final ShadowCacheType MULTIPLE_BLOOM_FILTER

A shadow cache with multiple bloom filter implementation. It creates a chain of bloom filters that support updating operation which updates one of them during each sub-window, and switch operation which switch to the least recently used BF and clear it on switching sub-window.

CLOCK_CUCKOO_FILTER

public static final ShadowCacheType CLOCK_CUCKOO_FILTER

A shadow cache with clock cuckoo filter implementation. It creates a cuckoo filter with extended field (clock, size, etc.). Thanks to the deletable feature of cuckoo filter, it can adapt to dynamic workload more smoothly. Clock cuckoo filter will `aging` all entries periodically. Specifically, it scans all stored entries, decreases their clock value, and deletes the stale ones whose clock value are reduced to zero. This process is similar to the well-known CLOCK algorithm, which is why we name it clock cuckoo filter.

Method Detail

values

public static ShadowCacheType[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

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

Returns:

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

valueOf

public static ShadowCacheType valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (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 type has no constant with the specified name

NullPointerException - if the argument is null