Package org.apache.ignite.configuration

Enum WALMode

    • Enum Constant Detail

      • FSYNC

        public static final WALMode FSYNC
        FSYNC mode: full-sync disk writes. These writes survive power loss scenarios. When a control is returned from the transaction commit operation, the changes are guaranteed to be persisted to disk according to the transaction write synchronization mode.

      • LOG_ONLY

        public static final WALMode LOG_ONLY
        Log only mode: flushes application buffers. These writes survive process crash. When a control is returned from the transaction commit operation, the changes are guaranteed to be forced to the OS buffer cache. It's up to the OS to decide when to flush its caches to disk.

      • BACKGROUND

        public static final WALMode BACKGROUND
        Background mode. Does not force application's buffer flush. Last updates may be lost in case of a process crash.

      • NONE

        public static final WALMode NONE
        WAL is disabled. Data is guaranteed to be persisted on disk only in case of graceful cluster shutdown using IgniteCluster.state(ClusterState) method. If an Ignite node is terminated in NONE mode abruptly, it is likely that the data stored on disk is corrupted and work directory will need to be cleared for a node restart.

      • DEFAULT

        @Deprecated
public static final WALMode DEFAULT
        Deprecated.
        This mode is no longer default and left here only for API compatibility. It is equivalent to the FSYNC mode.
        Default mode: full-sync disk writes. These writes survive power loss scenarios. When a control is returned from the transaction commit operation, the changes are guaranteed to be persisted to disk according to the transaction write synchronization mode.

    • Method Detail

      • values

        public static WALMode[] 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 (WALMode c : WALMode.values())
    System.out.println(c);
        Returns:
        an array containing the constants of this enum type, in the order they are declared

      • valueOf

        public static WALMode 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 WALMode fromOrdinal​(int ord)
        Efficiently gets enumerated value from its ordinal.
        Parameters:
        ord - Ordinal value.
        Returns:
        Enumerated value or null if ordinal out of range.