alluxio.worker.block.evictor

Class PartialLRUEvictor

java.lang.Object

alluxio.worker.block.AbstractBlockStoreEventListener

alluxio.worker.block.evictor.AbstractEvictor

alluxio.worker.block.evictor.LRUEvictor

alluxio.worker.block.evictor.PartialLRUEvictor

All Implemented Interfaces:

BlockStoreEventListener, Evictor

@NotThreadSafe
public class PartialLRUEvictor
extends LRUEvictor

This class is used to evict old blocks in certain StorageDir by LRU. The main difference between PartialLRU and LRU is that LRU choose old blocks among several StorageDirs until one StorageDir satisfies the request space, but PartialLRU select one StorageDir with maximum free space first and evict old blocks in the selected StorageDir by LRU

Nested Class Summary

Nested classes/interfaces inherited from interface alluxio.worker.block.evictor.Evictor

Evictor.Factory, Evictor.Mode

Field Summary

Fields inherited from class alluxio.worker.block.evictor.LRUEvictor

mLRUCache

Fields inherited from class alluxio.worker.block.evictor.AbstractEvictor

mAllocator, mMetadataView

Constructor Summary

Constructors

Constructor and Description
PartialLRUEvictor(BlockMetadataEvictorView view, Allocator allocator) Creates a new instance of PartialLRUEvictor.

Method Summary

Modifier and Type	Method and Description
protected BlockStoreLocation	updateBlockStoreLocation(long bytesToBeAvailable, BlockStoreLocation location) Updates the block store location if the evictor wants to free space in a specific location.

Methods inherited from class alluxio.worker.block.evictor.LRUEvictor

getBlockIterator, onAccessBlock, onBlockLost, onCommitBlock, onRemoveBlockByClient, onRemoveBlockByWorker, onRemoveBlockFromIterator

Methods inherited from class alluxio.worker.block.evictor.AbstractEvictor

cascadingEvict, freeSpaceWithView, freeSpaceWithView

Methods inherited from class alluxio.worker.block.AbstractBlockStoreEventListener

onAbortBlock, onMoveBlockByClient, onMoveBlockByWorker, onStorageLost

Methods inherited from class java.lang.Object

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

Constructor Detail

PartialLRUEvictor

public PartialLRUEvictor(BlockMetadataEvictorView view,
                         Allocator allocator)

Creates a new instance of PartialLRUEvictor.

Parameters:

view - a view of block metadata information

allocator - an allocation policy

Method Detail

updateBlockStoreLocation

protected BlockStoreLocation updateBlockStoreLocation(long bytesToBeAvailable,
                                                      BlockStoreLocation location)

Description copied from class: AbstractEvictor

Updates the block store location if the evictor wants to free space in a specific location. For example, PartialLRUEvictor always evicts blocks from a dir with max free space.

Overrides:

updateBlockStoreLocation in class AbstractEvictor

Parameters:

bytesToBeAvailable - bytes to be available after eviction

location - the original block store location

Returns:

the updated block store location