DelayedAllocationService (server 6.8.21 API)

java.lang.Object
- org.elasticsearch.common.component.AbstractLifecycleComponent
- - org.elasticsearch.cluster.routing.DelayedAllocationService

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable, ClusterStateListener, LifecycleComponent, Releasable
```
public class DelayedAllocationService
extends AbstractLifecycleComponent
implements ClusterStateListener
```
The DelayedAllocationService listens to cluster state changes and checks if there are unassigned shards with delayed allocation (unassigned shards that have the delay marker). These are shards that have become unassigned due to a node leaving and which were assigned the delay marker based on the index delay setting UnassignedInfo.INDEX_DELAYED_NODE_LEFT_TIMEOUT_SETTING (see AllocationService.disassociateDeadNodes(RoutingAllocation). This class is responsible for choosing the next (closest) delay expiration of a delayed shard to schedule a reroute to remove the delay marker. The actual removal of the delay marker happens in AllocationService.removeDelayMarkers(RoutingAllocation), triggering yet another cluster change event.

Field Summary
- Fields inherited from class org.elasticsearch.common.component.AbstractLifecycleComponent
  lifecycle

Constructor Summary

Constructors
Constructor	Description
`DelayedAllocationService(ThreadPool threadPool, ClusterService clusterService, AllocationService allocationService)`

Method Summary

Modifier and Type	Method	Description
`protected void`	`assertClusterOrMasterStateThread()`
`void`	`clusterChanged(ClusterChangedEvent event)`	Called when cluster state changes.
`protected long`	`currentNanoTime()`	override this to control time based decisions during delayed allocation
`protected void`	`doClose()`
`protected void`	`doStart()`
`protected void`	`doStop()`

Methods inherited from class org.elasticsearch.common.component.AbstractLifecycleComponent
addLifecycleListener, close, lifecycleState, removeLifecycleListener, start, stop

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

- Constructor Detail
  - DelayedAllocationService
```
@Inject
public DelayedAllocationService(ThreadPool threadPool,
                                ClusterService clusterService,
                                AllocationService allocationService)
```
- Method Detail
  - doStart
```
protected void doStart()
```
    Specified by:
    
    doStart in class AbstractLifecycleComponent
  - doStop
```
protected void doStop()
```
    Specified by:
    
    doStop in class AbstractLifecycleComponent
  - doClose
```
protected void doClose()
```
    Specified by:
    
    doClose in class AbstractLifecycleComponent
  - currentNanoTime
```
protected long currentNanoTime()
```
    override this to control time based decisions during delayed allocation
  - clusterChanged
```
public void clusterChanged(ClusterChangedEvent event)
```
    Description copied from interface: ClusterStateListener
    
    Called when cluster state changes.
    
    Specified by:
    
    clusterChanged in interface ClusterStateListener
  - assertClusterOrMasterStateThread
```
protected void assertClusterOrMasterStateThread()
```