Module org.elasticsearch.server

Package org.elasticsearch.cluster.routing

Class DelayedAllocationService

java.lang.Object

org.elasticsearch.common.component.AbstractLifecycleComponent

org.elasticsearch.cluster.routing.DelayedAllocationService

All Implemented Interfaces:

Closeable, 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.RerouteStrategy.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()	Close this component.
protected void	doStart()	Start this component.
protected void	doStop()	Stop this component.

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

addLifecycleListener, close, lifecycleState, start, stop

Methods inherited from class java.lang.Object

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

Constructor Details

DelayedAllocationService

@Inject
public DelayedAllocationService(ThreadPool threadPool,
 ClusterService clusterService,
 AllocationService allocationService)

Method Details

doStart

protected void doStart()

Description copied from class: AbstractLifecycleComponent

Start this component. Typically that means doing things like launching background processes and registering listeners on other components. Other components have been initialized by this point, but may not yet be started.

If this method throws an exception then the startup process will fail, but this component will not be stopped before it is closed.

This method is called while synchronized on AbstractLifecycleComponent.lifecycle. It is only called once in the lifetime of a component, although it may not be called at all if the startup process encountered some kind of fatal error, such as the failure of some other component to initialize or start.

Specified by:

doStart in class AbstractLifecycleComponent

doStop

protected void doStop()

Description copied from class: AbstractLifecycleComponent

Stop this component. Typically that means doing the reverse of whatever AbstractLifecycleComponent.doStart() does.

This method is called while synchronized on AbstractLifecycleComponent.lifecycle. It is only called once in the lifetime of a component, after calling AbstractLifecycleComponent.doStart(), although it will not be called at all if this component did not successfully start.

Specified by:

doStop in class AbstractLifecycleComponent

doClose

protected void doClose()

Description copied from class: AbstractLifecycleComponent

Close this component. Typically that means doing the reverse of whatever happened during initialization, such as releasing resources acquired there.

This method is called while synchronized on AbstractLifecycleComponent.lifecycle. It is called once in the lifetime of a component. If the component was started then it will be stopped before it is closed, and once it is closed it will not be started or stopped.

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.

Cluster states are applied one-by-one which means they can be a performance bottleneck. Implementations of this method should therefore be fast, so please consider forking work into the background rather than doing everything inline.

Specified by:

clusterChanged in interface ClusterStateListener

assertClusterOrMasterStateThread

protected void assertClusterOrMasterStateThread()