Package org.apache.ignite.events
Class ClusterStateChangeStartedEvent
- java.lang.Object
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- org.apache.ignite.events.EventAdapter
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- org.apache.ignite.events.ClusterStateChangeStartedEvent
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- All Implemented Interfaces:
Serializable
,Comparable<Event>
,Event
public class ClusterStateChangeStartedEvent extends EventAdapter
Cluster state change started event.Grid events are used for notification about what happens within the grid. Note that by design Ignite keeps all events generated on the local node locally and it provides APIs for performing a distributed queries across multiple nodes:
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IgniteEvents.remoteQuery(IgnitePredicate, long, int...)
- asynchronously querying events occurred on the nodes specified, including remote nodes. -
IgniteEvents.localQuery(IgnitePredicate, int...)
- querying only local events stored on this local node. -
IgniteEvents.localListen(IgnitePredicate, int...)
- listening to local grid events (events from remote nodes not included).
IgniteEvents.waitForLocal(IgnitePredicate, int...)
.Events and Performance
Note that by default all events in Ignite are enabled and therefore generated and stored by whatever event storage SPI is configured. Ignite can and often does generate thousands events per seconds under the load and therefore it creates a significant additional load on the system. If these events are not needed by the application this load is unnecessary and leads to significant performance degradation.It is highly recommended to enable only those events that your application logic requires by using
IgniteConfiguration.getIncludeEventTypes()
method in Ignite configuration. Note that certain events are required for Ignite's internal operations and such events will still be generated but not stored by event storage SPI if they are disabled in Ignite configuration.
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Constructor Summary
Constructors Constructor Description ClusterStateChangeStartedEvent(ClusterState prevState, ClusterState state, ClusterNode node, String msg, UUID subjId)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description ClusterState
previousState()
ClusterState
state()
@Nullable UUID
subjectId()
Gets security subject ID initiated state change.
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Constructor Detail
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ClusterStateChangeStartedEvent
public ClusterStateChangeStartedEvent(ClusterState prevState, ClusterState state, ClusterNode node, String msg, UUID subjId)
- Parameters:
prevState
- Previous cluster state.state
- New cluster state.node
- Node.msg
- Optional event message.subjId
- Subject ID.
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Method Detail
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previousState
public ClusterState previousState()
- Returns:
- Previous cluster state.
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state
public ClusterState state()
- Returns:
- New cluster state.
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subjectId
@Nullable public @Nullable UUID subjectId()
Gets security subject ID initiated state change.- Returns:
- Subject ID if security is enabled, otherwise null.
- See Also:
IgniteSecurity.enabled()
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