alluxio.worker.block.allocator

Class RoundRobinAllocator

java.lang.Object

alluxio.worker.block.allocator.RoundRobinAllocator

All Implemented Interfaces:

Allocator

@NotThreadSafe
public final class RoundRobinAllocator
extends Object
implements Allocator

A round-robin allocator that allocates a block in the storage dir. It will allocate the block in the highest tier possible: It always starts from the highest tier in a RR manner and goes to the next tier when there is not enough space. The allocator only considers non-specific writes in its RR policy (the location is either AnyTier or AnyDirInTier).

Nested Class Summary

Nested classes/interfaces inherited from interface alluxio.worker.block.allocator.Allocator

Allocator.Factory

Constructor Summary

Constructors

Constructor and Description
RoundRobinAllocator(BlockMetadataView view) Creates a new instance of RoundRobinAllocator.

Method Summary

Modifier and Type	Method and Description
StorageDirView	allocateBlockWithView(long sessionId, long blockSize, BlockStoreLocation location, BlockMetadataView metadataView) Allocates a block from the given block store location under a given view.

Methods inherited from class java.lang.Object

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

Constructor Detail

RoundRobinAllocator

public RoundRobinAllocator(BlockMetadataView view)

Creates a new instance of RoundRobinAllocator.

Parameters:

view - BlockMetadataView to pass to the allocator

Method Detail

allocateBlockWithView

public StorageDirView allocateBlockWithView(long sessionId,
                                            long blockSize,
                                            BlockStoreLocation location,
                                            BlockMetadataView metadataView)

Description copied from interface: Allocator

Allocates a block from the given block store location under a given view. The location can be a specific location, or BlockStoreLocation.anyTier() or BlockStoreLocation.anyDirInTier(String).

Specified by:

allocateBlockWithView in interface Allocator

Parameters:

sessionId - the id of session to apply for the block allocation

blockSize - the size of block in bytes

location - the location in block store

metadataView - of the block metadata

Returns:

a StorageDirView in which to create the temp block meta if success, null otherwise