ConcurrentRebalanceAllocationDecider (server 6.8.17 API)

java.lang.Object
- org.elasticsearch.cluster.routing.allocation.decider.AllocationDecider
- - org.elasticsearch.cluster.routing.allocation.decider.ConcurrentRebalanceAllocationDecider

```
public class ConcurrentRebalanceAllocationDecider
extends AllocationDecider
```
Similar to the ClusterRebalanceAllocationDecider this AllocationDecider controls the number of currently in-progress re-balance (relocation) operations and restricts node allocations if the configured threshold is reached. The default number of concurrent rebalance operations is set to 2
Re-balance operations can be controlled in real-time via the cluster update API using cluster.routing.allocation.cluster_concurrent_rebalance. Iff this setting is set to -1 the number of concurrent re-balance operations are unlimited.

Field Summary

Fields
Modifier and Type Field Description

static Setting<java.lang.Integer> CLUSTER_ROUTING_ALLOCATION_CLUSTER_CONCURRENT_REBALANCE_SETTING

static java.lang.String NAME

Constructor Summary

Constructors
Constructor Description

ConcurrentRebalanceAllocationDecider(Settings settings, ClusterSettings clusterSettings)

Method Summary

Modifier and Type	Method	Description
`Decision`	`canRebalance(RoutingAllocation allocation)`	Returns a `Decision` whether the cluster can execute re-balanced operations at all.
`Decision`	`canRebalance(ShardRouting shardRouting, RoutingAllocation allocation)`	Returns a `Decision` whether the given shard routing can be re-balanced to the given allocation.

Methods inherited from class org.elasticsearch.cluster.routing.allocation.decider.AllocationDecider
canAllocate, canAllocate, canAllocate, canAllocate, canForceAllocatePrimary, canRemain

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - NAME
```
public static final java.lang.String NAME
```
    See Also:
    
    Constant Field Values
  - CLUSTER_ROUTING_ALLOCATION_CLUSTER_CONCURRENT_REBALANCE_SETTING
```
public static final Setting<java.lang.Integer> CLUSTER_ROUTING_ALLOCATION_CLUSTER_CONCURRENT_REBALANCE_SETTING
```
- Constructor Detail
  - ConcurrentRebalanceAllocationDecider
```
public ConcurrentRebalanceAllocationDecider(Settings settings,
                                            ClusterSettings clusterSettings)
```
- Method Detail
  - canRebalance
```
public Decision canRebalance(ShardRouting shardRouting,
                             RoutingAllocation allocation)
```
    Description copied from class: AllocationDecider
    
    Returns a Decision whether the given shard routing can be re-balanced to the given allocation. The default is Decision.ALWAYS.
    
    Overrides:
    
    canRebalance in class AllocationDecider
  - canRebalance
```
public Decision canRebalance(RoutingAllocation allocation)
```
    Description copied from class: AllocationDecider
    
    Returns a Decision whether the cluster can execute re-balanced operations at all. Decision.ALWAYS.
    
    Overrides:
    
    canRebalance in class AllocationDecider