alluxio.worker.block.reviewer

Class ProbabilisticBufferReviewer

java.lang.Object

alluxio.worker.block.reviewer.ProbabilisticBufferReviewer

All Implemented Interfaces:

Reviewer

public class ProbabilisticBufferReviewer
extends Object
implements Reviewer

Reviews a block allocation, and probably rejects a bad block allocation. The more full a StorageDir, the higher the chance that this reviewer decides NOT to use it for a new block. The intention is to leave a buffer to each StorageDir by early stopping putting new blocks into it. The existing blocks in the StorageDir will likely read more data in and expand in size. We want to leave some space for the expansion, to lower the chance of eviction.

Nested Class Summary

Nested classes/interfaces inherited from interface alluxio.worker.block.reviewer.Reviewer

Reviewer.Factory

Constructor Summary

Constructors

Constructor and Description
ProbabilisticBufferReviewer() Constructor the instance from configuration.

Method Summary

Modifier and Type	Method and Description
boolean	acceptAllocation(StorageDirView dirView) Reviews an allocation proposed by the Allocator.

Methods inherited from class java.lang.Object

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

Constructor Detail

ProbabilisticBufferReviewer

public ProbabilisticBufferReviewer()

Constructor the instance from configuration.

Method Detail

acceptAllocation

public boolean acceptAllocation(StorageDirView dirView)

Description copied from interface: Reviewer

Reviews an allocation proposed by the Allocator. Returning true means the allocation is accepted. Returning false meanes the allocation is rejected.

Specified by:

acceptAllocation in interface Reviewer

Parameters:

dirView - the storage dir that the block is allocated to

Returns:

whether the allocation is accepted