Module org.elasticsearch.server

Package org.elasticsearch.cluster.coordination

Class JoinValidationService

java.lang.Object

org.elasticsearch.cluster.coordination.JoinValidationService

public class JoinValidationService
extends Object

Coordinates the join validation process.

When a node requests to join an existing cluster, the master first sends it a copy of a recent cluster state to ensure that the new node can make sense of it (e.g. it has all the plugins it needs to even deserialize the state). Cluster states can be expensive to serialize: they are large, so we compress them, but the compression takes extra CPU. Also there may be many nodes all joining at once (e.g. after a full cluster restart or the healing of a large network partition). This component caches the serialized and compressed state that was sent to one joining node and reuses it to validate other join requests that arrive within the cache timeout, avoiding the need to allocate memory for each request and repeat all that serialization and compression work each time.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	JOIN_VALIDATE_ACTION_NAME
static final Setting<TimeValue>	JOIN_VALIDATION_CACHE_TIMEOUT_SETTING

Constructor Summary

Constructors

Constructor	Description
JoinValidationService(Settings settings, TransportService transportService, Supplier<ClusterState> clusterStateSupplier, Collection<BiConsumer<DiscoveryNode,ClusterState>> joinValidators)

Method Summary

Modifier and Type	Method	Description
void	stop()
void	validateJoin(DiscoveryNode discoveryNode, ActionListener<TransportResponse.Empty> listener)

Methods inherited from class java.lang.Object

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

Field Details

JOIN_VALIDATE_ACTION_NAME

public static final String JOIN_VALIDATE_ACTION_NAME

See Also:

• Constant Field Values

JOIN_VALIDATION_CACHE_TIMEOUT_SETTING

public static final Setting<TimeValue> JOIN_VALIDATION_CACHE_TIMEOUT_SETTING

Constructor Details

JoinValidationService

public JoinValidationService(Settings settings,
 TransportService transportService,
 Supplier<ClusterState> clusterStateSupplier,
 Collection<BiConsumer<DiscoveryNode,ClusterState>> joinValidators)

Method Details

validateJoin

public void validateJoin(DiscoveryNode discoveryNode,
 ActionListener<TransportResponse.Empty> listener)

stop

public void stop()