alluxio.client.block.policy

Class LocalFirstAvoidEvictionPolicy

java.lang.Object

alluxio.client.block.policy.LocalFirstAvoidEvictionPolicy

All Implemented Interfaces:

BlockLocationPolicy

@ThreadSafe
public final class LocalFirstAvoidEvictionPolicy
extends Object
implements BlockLocationPolicy

A policy that returns local host first, and if the local worker doesn't have enough availability, it randomly picks a worker from the active workers list for each block write. If no worker meets the demands, return local host. USER_FILE_WRITE_AVOID_EVICTION_POLICY_RESERVED_BYTES is used to reserve some space of the worker to store the block, for the values mCapacityBytes minus mUsedBytes is not the available bytes.

Nested Class Summary

Nested classes/interfaces inherited from interface alluxio.client.block.policy.BlockLocationPolicy

BlockLocationPolicy.Factory

Constructor Summary

Constructors

Constructor and Description
LocalFirstAvoidEvictionPolicy(AlluxioConfiguration conf) Constructs a new LocalFirstAvoidEvictionPolicy.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
WorkerNetAddress	getWorker(GetWorkerOptions options) Gets the worker's network address for serving operations requested for the block.
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

LocalFirstAvoidEvictionPolicy

public LocalFirstAvoidEvictionPolicy(AlluxioConfiguration conf)

Constructs a new LocalFirstAvoidEvictionPolicy.

Parameters:

conf - Alluxio configuration

Method Detail

getWorker

public WorkerNetAddress getWorker(GetWorkerOptions options)

Description copied from interface: BlockLocationPolicy

Gets the worker's network address for serving operations requested for the block.

Specified by:

getWorker in interface BlockLocationPolicy

Parameters:

options - the options to get a block worker network address for a block

Returns:

the address of the worker to write to, null if no worker can be selected

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object