HeadlessServiceDnsBootstrap

Looks up members of the same "service" in DNS and initiates HttpContactPointBootstrap's for each such node. If any of the contact-points returns a list of seed nodes it joins them immediately.

If contact points do not return any seed-nodes for a contactPointNoSeedsStableMargin amount of time, we decide that apparently there is no cluster formed yet in this deployment and someone as to become the first node to join itself (becoming the first node of the cluster, that all other nodes will join).

The decision of joining "self" is made by deterministically sorting the discovered service IPs and picking the *lowest* address.

If this node is the one with the lowest address in the deployment, it will join itself and other nodes will notice this via the contact-point probing mechanism and join this node. Please note while the cluster is "growing" more nodes become aware of the cluster and start returning the seed-nodes in their contact-points, thus the joining process becomes somewhat "epidemic". Other nodes may get to know about this cluster by contacting any other node that has joined it already, and they may join any seed-node that they retrieve using this method, as effectively this will mean it joins the "right" cluster.

CAVEATS: There is a slight timing issue, that may theoretically appear in this bootstrap process. FIXME explain the races

Linear Supertypes

Timers, ActorLogging, Actor, AnyRef, Any

Instance Constructors

new HeadlessServiceDnsBootstrap(discovery: SimpleServiceDiscovery, settings: ClusterBootstrapSettings)

Type Members

type Receive = PartialFunction[Any, Unit]

Definition Classes
Actor

Value Members

final def !=(arg0: Any): Boolean

Definition Classes
AnyRef → Any
final def ##(): Int

Definition Classes
AnyRef → Any
final def ==(arg0: Any): Boolean

Definition Classes
AnyRef → Any
def aroundPostRestart(reason: Throwable): Unit

Attributes
protected[akka]
Definition Classes
Actor
Annotations
@InternalApi()
def aroundPostStop(): Unit

Attributes
protected[akka]
Definition Classes
Timers → Actor
def aroundPreRestart(reason: Throwable, message: Option[Any]): Unit

Attributes
protected[akka]
Definition Classes
Timers → Actor
def aroundPreStart(): Unit

Attributes
protected[akka]
Definition Classes
Actor
Annotations
@InternalApi()
def aroundReceive(receive: actor.Actor.Receive, msg: Any): Unit

Attributes
protected[akka]
Definition Classes
Timers → Actor
final def asInstanceOf[T0]: T0

Definition Classes
Any
def bootstraping(serviceName: String, replyTo: ActorRef): Receive

In process of searching for seed-nodes
def clone(): AnyRef

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( ... )
implicit val context: ActorContext

Definition Classes
Actor
final def eq(arg0: AnyRef): Boolean

Definition Classes
AnyRef
def equals(arg0: Any): Boolean

Definition Classes
AnyRef → Any
def finalize(): Unit

Attributes
protected[java.lang]
Definition Classes
AnyRef
Annotations
@throws( classOf[java.lang.Throwable] )
final def getClass(): Class[_]

Definition Classes
AnyRef → Any
def hashCode(): Int

Definition Classes
AnyRef → Any
final def isInstanceOf[T0]: Boolean

Definition Classes
Any
def log: LoggingAdapter

Definition Classes
ActorLogging
final def ne(arg0: AnyRef): Boolean

Definition Classes
AnyRef
final def notify(): Unit

Definition Classes
AnyRef
final def notifyAll(): Unit

Definition Classes
AnyRef
def postRestart(reason: Throwable): Unit

Definition Classes
Actor
Annotations
@throws( classOf[java.lang.Exception] )
def postStop(): Unit

Definition Classes
Actor
Annotations
@throws( classOf[java.lang.Exception] )
def preRestart(reason: Throwable, message: Option[Any]): Unit

Definition Classes
Actor
Annotations
@throws( classOf[java.lang.Exception] )
def preStart(): Unit

Definition Classes
Actor
Annotations
@throws( classOf[java.lang.Exception] )
def receive: Receive

Awaiting initial signal to start the bootstrap process
Awaiting initial signal to start the bootstrap process

Definition Classes
HeadlessServiceDnsBootstrap → Actor
implicit final val self: ActorRef

Definition Classes
Actor
final def sender(): ActorRef

Definition Classes
Actor
def supervisorStrategy: SupervisorStrategy

Definition Classes
Actor
final def synchronized[T0](arg0: ⇒ T0): T0

Definition Classes
AnyRef
def timeNow(): Long

Attributes
protected
final def timers: TimerScheduler

Definition Classes
Timers
def toString(): String

Definition Classes
AnyRef → Any
def unhandled(message: Any): Unit

Definition Classes
Actor
final def wait(): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long, arg1: Int): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )
final def wait(arg0: Long): Unit

Definition Classes
AnyRef
Annotations
@throws( ... )

Related Doc: package dns

final class HeadlessServiceDnsBootstrap extends Actor with ActorLogging with Timers

Instance Constructors

new HeadlessServiceDnsBootstrap(discovery: SimpleServiceDiscovery, settings: ClusterBootstrapSettings)

Type Members

type Receive = PartialFunction[Any, Unit]

Value Members

final def !=(arg0: Any): Boolean

final def ##(): Int

final def ==(arg0: Any): Boolean

def aroundPostRestart(reason: Throwable): Unit

def aroundPostStop(): Unit

def aroundPreRestart(reason: Throwable, message: Option[Any]): Unit

def aroundPreStart(): Unit

def aroundReceive(receive: actor.Actor.Receive, msg: Any): Unit

final def asInstanceOf[T0]: T0

def bootstraping(serviceName: String, replyTo: ActorRef): Receive

def clone(): AnyRef

implicit val context: ActorContext

final def eq(arg0: AnyRef): Boolean

def equals(arg0: Any): Boolean

def finalize(): Unit

final def getClass(): Class[_]

def hashCode(): Int

final def isInstanceOf[T0]: Boolean

def log: LoggingAdapter

final def ne(arg0: AnyRef): Boolean

final def notify(): Unit

final def notifyAll(): Unit

def postRestart(reason: Throwable): Unit

def postStop(): Unit

def preRestart(reason: Throwable, message: Option[Any]): Unit

def preStart(): Unit

def receive: Receive

implicit final val self: ActorRef

final def sender(): ActorRef

def supervisorStrategy: SupervisorStrategy

final def synchronized[T0](arg0: ⇒ T0): T0

def timeNow(): Long

final def timers: TimerScheduler

def toString(): String

def unhandled(message: Any): Unit

final def wait(): Unit

final def wait(arg0: Long, arg1: Int): Unit

final def wait(arg0: Long): Unit

Inherited from Timers

Inherited from ActorLogging

Inherited from Actor

Inherited from AnyRef

Inherited from Any

Ungrouped