org.apache.ignite.configuration

Enum CheckpointWriteOrder

java.lang.Object

java.lang.Enum<CheckpointWriteOrder>

org.apache.ignite.configuration.CheckpointWriteOrder

All Implemented Interfaces:

Serializable, Comparable<CheckpointWriteOrder>

public enum CheckpointWriteOrder
extends Enum<CheckpointWriteOrder>

This enum defines order of writing pages to disk storage during checkpoint.

Enum Constant Summary

Enum Constants

Enum Constant and Description
RANDOM Pages are written in order provided by checkpoint pages collection iterator (which is basically a hashtable).
SEQUENTIAL All checkpoint pages are collected into single list and sorted by page index.

Method Summary

Modifier and Type	Method and Description
static @Nullable CheckpointWriteOrder	fromOrdinal(int ord) Efficiently gets enumerated value from its ordinal.
static CheckpointWriteOrder	valueOf(String name) Returns the enum constant of this type with the specified name.
static CheckpointWriteOrder[]	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

RANDOM

public static final CheckpointWriteOrder RANDOM

Pages are written in order provided by checkpoint pages collection iterator (which is basically a hashtable).

SEQUENTIAL

public static final CheckpointWriteOrder SEQUENTIAL

All checkpoint pages are collected into single list and sorted by page index. Provides almost sequential disk writes, which can be much faster on some SSD models.

Method Detail

values

public static CheckpointWriteOrder[] 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 (CheckpointWriteOrder c : CheckpointWriteOrder.values())
    System.out.println(c);

Returns:

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

valueOf

public static CheckpointWriteOrder 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

fromOrdinal

@Nullable
public static @Nullable CheckpointWriteOrder fromOrdinal(int ord)

Efficiently gets enumerated value from its ordinal.

Parameters:

ord - Ordinal value.

Returns:

Enumerated value or null if ordinal out of range.