alluxio.master.file

Enum MetadataSyncTraversalOrder

java.lang.Object

java.lang.Enum<MetadataSyncTraversalOrder>

alluxio.master.file.MetadataSyncTraversalOrder

All Implemented Interfaces:

Serializable, Comparable<MetadataSyncTraversalOrder>

public enum MetadataSyncTraversalOrder
extends Enum<MetadataSyncTraversalOrder>

The pending Path in the Inode SyncStream traversal order. For general-scale directory, BFS can archive better sync speed. For super-large-scale directory (> 100_000_000), BFS may cause a large amount of memory to be used for ufsStatusCache. DFS can ensure a smaller ufsStatusCache size to make the memory smaller and the gc time shorter. If the size of ufsStatusCache is still large, consider setting PropertyKey.MASTER_METADATA_SYNC_PREFETCH_CHILDREN_UFS_STATUS to false.

Enum Constant Summary

Enum Constants

Enum Constant and Description
BFS
DFS

Method Summary

Modifier and Type	Method and Description
static MetadataSyncTraversalOrder	valueOf(String name) Returns the enum constant of this type with the specified name.
static MetadataSyncTraversalOrder[]	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

BFS

public static final MetadataSyncTraversalOrder BFS

DFS

public static final MetadataSyncTraversalOrder DFS

Method Detail

values

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

Returns:

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

valueOf

public static MetadataSyncTraversalOrder 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