Discovery (server 6.8.17 API)

All Superinterfaces:

java.lang.AutoCloseable, java.io.Closeable, LifecycleComponent, Releasable

All Known Implementing Classes:

SingleNodeDiscovery, ZenDiscovery
```
public interface Discovery
extends LifecycleComponent
```
A pluggable module allowing to implement discovery of other nodes, publishing of the cluster state to all nodes, electing a master of the cluster that raises cluster state change events.

Nested Class Summary

Nested Classes
Modifier and Type Interface Description

static interface Discovery.AckListener

static class Discovery.FailedToCommitClusterStateException

Method Summary

Modifier and Type	Method	Description
`void`	`publish(ClusterChangedEvent clusterChangedEvent, Discovery.AckListener ackListener)`	Publish all the changes to the cluster from the master (can be called just by the master).
`void`	`startInitialJoin()`	Triggers the first join cycle
`DiscoveryStats`	`stats()`

Methods inherited from interface org.elasticsearch.common.component.LifecycleComponent
addLifecycleListener, lifecycleState, removeLifecycleListener, start, stop

Methods inherited from interface org.elasticsearch.common.lease.Releasable
close

- Method Detail
  - publish
```
void publish(ClusterChangedEvent clusterChangedEvent,
             Discovery.AckListener ackListener)
```
    Publish all the changes to the cluster from the master (can be called just by the master). The publish process should apply this state to the master as well! The Discovery.AckListener allows to keep track of the ack received from nodes, and verify whether they updated their own cluster state or not. The method is guaranteed to throw a Discovery.FailedToCommitClusterStateException if the change is not committed and should be rejected. Any other exception signals the something wrong happened but the change is committed.
  - stats
```
DiscoveryStats stats()
```
    Returns:
    
    stats about the discovery
  - startInitialJoin
```
void startInitialJoin()
```
    Triggers the first join cycle