org.elasticsearch.cluster.routing.allocation.decider

Class SameShardAllocationDecider

java.lang.Object

org.elasticsearch.common.component.AbstractComponent

org.elasticsearch.cluster.routing.allocation.decider.AllocationDecider

org.elasticsearch.cluster.routing.allocation.decider.SameShardAllocationDecider

public class SameShardAllocationDecider
extends AllocationDecider

An allocation decider that prevents multiple instances of the same shard to be allocated on the same node. The "cluster.routing.allocation.same_shard.host" setting allows to perform a check to prevent allocation of multiple instances of the same shard on a single host, based on host name and host address. Defaults to `false`, meaning that no check is performed by default.

Note: this setting only applies if multiple nodes are started on the same host. Allocations of multiple copies of the same shard on the same node are not allowed independently of this setting.

Field Summary

Fields

Modifier and Type	Field and Description
static String	NAME
static String	SAME_HOST_SETTING

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

deprecationLogger, logger, settings

Constructor Summary

Constructors

Constructor and Description
SameShardAllocationDecider(Settings settings)

Method Summary

Methods

Modifier and Type	Method and Description
Decision	canAllocate(ShardRouting shardRouting, RoutingNode node, RoutingAllocation allocation) Returns a Decision whether the given shard routing can be allocated on the given node.

Methods inherited from class org.elasticsearch.cluster.routing.allocation.decider.AllocationDecider

canAllocate, canAllocate, canAllocate, canRebalance, canRebalance, canRemain

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

logDeprecatedSetting, logRemovedSetting, nodeName

Methods inherited from class java.lang.Object

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

Field Detail

NAME

public static final String NAME

See Also:

Constant Field Values

SAME_HOST_SETTING

public static final String SAME_HOST_SETTING

See Also:

Constant Field Values

Constructor Detail

SameShardAllocationDecider

@Inject
public SameShardAllocationDecider(Settings settings)

Method Detail

canAllocate

public Decision canAllocate(ShardRouting shardRouting,
                   RoutingNode node,
                   RoutingAllocation allocation)

Description copied from class: AllocationDecider

Returns a Decision whether the given shard routing can be allocated on the given node. The default is Decision.ALWAYS.

Overrides:

canAllocate in class AllocationDecider