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

    All Methods Static Methods Concrete Methods
    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.

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Ignite Database and Caching Platform | : ver. 2.12.0
Release Date | : January 10 2022