org.elasticsearch.cluster.routing.allocation.allocator

Class ShardsAllocators

java.lang.Object

org.elasticsearch.common.component.AbstractComponent

org.elasticsearch.cluster.routing.allocation.allocator.ShardsAllocators

All Implemented Interfaces:

ShardsAllocator

public class ShardsAllocators
extends AbstractComponent
implements ShardsAllocator

The ShardsAllocator class offers methods for allocating shard within a cluster. These methods include moving shards and re-balancing the cluster. It also allows management of shards by their state.

Field Summary

Fields inherited from class org.elasticsearch.common.component.AbstractComponent

componentSettings, logger, settings

Constructor Summary

Constructors

Constructor and Description
ShardsAllocators()
ShardsAllocators(Settings settings)
ShardsAllocators(Settings settings, GatewayAllocator gatewayAllocator, ShardsAllocator allocator)

Method Summary

Modifier and Type	Method and Description
boolean	allocateUnassigned(RoutingAllocation allocation) Assign all unassigned shards to nodes
void	applyFailedShards(FailedRerouteAllocation allocation) Applies changes on failed nodes based on the implemented algorithm.
void	applyStartedShards(StartedRerouteAllocation allocation) Applies changes on started nodes based on the implemented algorithm.
boolean	move(MutableShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) Moves a shard from the given node to other node.
boolean	rebalance(RoutingAllocation allocation) Rebalancing number of shards on all nodes

Methods inherited from class org.elasticsearch.common.component.AbstractComponent

nodeName

Methods inherited from class java.lang.Object

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

Constructor Detail

ShardsAllocators

public ShardsAllocators()

ShardsAllocators

public ShardsAllocators(Settings settings)

ShardsAllocators

@Inject
public ShardsAllocators(Settings settings,
                                GatewayAllocator gatewayAllocator,
                                ShardsAllocator allocator)

Method Detail

applyStartedShards

public void applyStartedShards(StartedRerouteAllocation allocation)

Description copied from interface: ShardsAllocator

Applies changes on started nodes based on the implemented algorithm. For example if a shard has changed to ShardRoutingState.STARTED from ShardRoutingState.RELOCATING this allocator might apply some cleanups on the node that used to hold the shard.

Specified by:

applyStartedShards in interface ShardsAllocator

Parameters:

allocation - all started shards

applyFailedShards

public void applyFailedShards(FailedRerouteAllocation allocation)

Description copied from interface: ShardsAllocator

Applies changes on failed nodes based on the implemented algorithm.

Specified by:

applyFailedShards in interface ShardsAllocator

Parameters:

allocation - all failed shards

allocateUnassigned

public boolean allocateUnassigned(RoutingAllocation allocation)

Description copied from interface: ShardsAllocator

Assign all unassigned shards to nodes

Specified by:

allocateUnassigned in interface ShardsAllocator

Parameters:

allocation - current node allocation

Returns:

true if the allocation has changed, otherwise false

rebalance

public boolean rebalance(RoutingAllocation allocation)

Description copied from interface: ShardsAllocator

Rebalancing number of shards on all nodes

Specified by:

rebalance in interface ShardsAllocator

Parameters:

allocation - current node allocation

Returns:

true if the allocation has changed, otherwise false

move

public boolean move(MutableShardRouting shardRouting,
                    RoutingNode node,
                    RoutingAllocation allocation)

Description copied from interface: ShardsAllocator

Moves a shard from the given node to other node.

Specified by:

move in interface ShardsAllocator

Parameters:

shardRouting - the shard to move

node - A node containing the shard

allocation - current node allocation

Returns:

true if the allocation has changed, otherwise false