org.gridgain.grid.ggfs

Enum GridGgfsMode

java.lang.Object

java.lang.Enum<GridGgfsMode>

org.gridgain.grid.ggfs.GridGgfsMode

All Implemented Interfaces:

Serializable, Comparable<GridGgfsMode>

public enum GridGgfsMode
extends Enum<GridGgfsMode>

GGFS mode defining interactions with underlying secondary Hadoop file system. Secondary Hadoop file system is provided for pass-through, write-through, and read-through purposes.

This mode is configured via GridGgfsConfiguration.getDefaultMode() configuration property.

Enum Constant Summary

Enum Constants

Enum Constant and Description
DUAL_ASYNC In this mode GGFS will cache files locally and also asynchronously write them through to secondary Hadoop file system.
DUAL_SYNC In this mode GGFS will cache files locally and also synchronously write them through to secondary Hadoop file system.
PRIMARY In this mode GGFS will not delegate to secondary Hadoop file system and will cache all the files in memory only.
PROXY In this mode GGFS will not cache any files in memory and will only pass them through to secondary Hadoop file system.

Method Summary

Methods

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

PRIMARY

public static final GridGgfsMode PRIMARY

In this mode GGFS will not delegate to secondary Hadoop file system and will cache all the files in memory only.

PROXY

public static final GridGgfsMode PROXY

In this mode GGFS will not cache any files in memory and will only pass them through to secondary Hadoop file system. If this mode is enabled, then secondary Hadoop file system must be configured.

See Also:

GridGgfsConfiguration.getSecondaryHadoopFileSystemUri()

DUAL_SYNC

public static final GridGgfsMode DUAL_SYNC

In this mode GGFS will cache files locally and also synchronously write them through to secondary Hadoop file system.

If secondary Hadoop file system is not configured, then this mode behaves like PRIMARY mode.

See Also:

GridGgfsConfiguration.getSecondaryHadoopFileSystemUri()

DUAL_ASYNC

public static final GridGgfsMode DUAL_ASYNC

In this mode GGFS will cache files locally and also asynchronously write them through to secondary Hadoop file system.

If secondary Hadoop file system is not configured, then this mode behaves like PRIMARY mode.

See Also:

GridGgfsConfiguration.getSecondaryHadoopFileSystemUri()

Method Detail

values

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

Returns:

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

valueOf

public static GridGgfsMode 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 GridGgfsMode fromOrdinal(int ord)

Efficiently gets enumerated value from its ordinal.

Parameters:

ord - Ordinal value.

Returns:

Enumerated value or null if ordinal out of range.