alluxio.client.file.cache.allocator

Class HashAllocator

java.lang.Object

alluxio.client.file.cache.allocator.HashAllocator

All Implemented Interfaces:

Allocator

Direct Known Subclasses:

AffinityHashAllocator

public class HashAllocator
extends java.lang.Object
implements Allocator

An implementation of Allocator base on the hash of the file id for local cache.

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.List<PageStoreDir>	mDirs

Constructor Summary

Constructors

Constructor and Description
HashAllocator(java.util.List<PageStoreDir> dirs)
HashAllocator(java.util.List<PageStoreDir> dirs, java.util.function.Function<java.lang.String,java.lang.Integer> hashFunction)

Method Summary

Modifier and Type	Method and Description
PageStoreDir	allocate(java.lang.String fileId, long fileLength)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

mDirs

protected final java.util.List<PageStoreDir> mDirs

Constructor Detail

HashAllocator

public HashAllocator(java.util.List<PageStoreDir> dirs)

Parameters:

dirs - page store directories

HashAllocator

public HashAllocator(java.util.List<PageStoreDir> dirs,
                     java.util.function.Function<java.lang.String,java.lang.Integer> hashFunction)

Parameters:

dirs - page store directories

hashFunction - hash function

Method Detail

allocate

public PageStoreDir allocate(java.lang.String fileId,
                             long fileLength)

Specified by:

allocate in interface Allocator

Returns:

the storage directory