Module org.elasticsearch.server

Package org.elasticsearch.cluster.routing.allocation.decider

Class IndexBalanceAllocationDecider

java.lang.Object

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

org.elasticsearch.cluster.routing.allocation.decider.IndexBalanceAllocationDecider

public class IndexBalanceAllocationDecider
extends AllocationDecider

For an index of n shards hosted by a cluster of m nodes, a node should not host significantly more than n / m shards. This allocation decider enforces this principle. This allocation decider excludes any nodes flagged for shutdown from consideration when computing optimal shard distributions.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	NAME

Constructor Summary

Constructors

Constructor	Description
IndexBalanceAllocationDecider(Settings settings, ClusterSettings clusterSettings)

Method Summary

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

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

canAllocate, canAllocate, canAllocateReplicaWhenThereIsRetentionLease, canForceAllocateDuringReplace, canForceAllocatePrimary, canRebalance, canRebalance, getForcedInitialShardAllocationToNodes, shouldAutoExpandToNode

Methods inherited from class java.lang.Object

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

Field Details

NAME

public static final String NAME

See Also:

• Constant Field Values

Constructor Details

IndexBalanceAllocationDecider

public IndexBalanceAllocationDecider(Settings settings,
 ClusterSettings clusterSettings)

Method Details

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

canRemain

public Decision canRemain(IndexMetadata indexMetadata,
 ShardRouting shardRouting,
 RoutingNode node,
 RoutingAllocation allocation)

Description copied from class: AllocationDecider

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

Overrides:

canRemain in class AllocationDecider