raboof/pekko
1
0
Fork 0
Code Issues Pull requests Projects Releases 6 Packages Wiki Activity Actions 10

Cluster node roles, see #3049

Browse source 
* Config of node roles cluster.role
* Cluster router configurable with use-role
* RoleLeaderChanged event
* Cluster singleton per role
* Cluster only starts once all required per-role node
  counts are reached,
  role.<role-name>.min-nr-of-members config
*  Update documentation and make use of the roles in the examples
This commit is contained in:
Patrik Nordwall 2013-03-14 20:32:43 +01:00
parent 6e8125a46e
commit 7eac88f372
49 changed files with 870 additions and 481 deletions
Download patch file Download diff file Expand all files Collapse all files

58
akka-cluster/src/main/scala/akka/cluster/ClusterEvent.scala
View file

@ -35,7 +35,8 @@ object ClusterEvent {
members: immutable.SortedSet[Member] = immutable.SortedSet.empty,
unreachable: Set[Member] = Set.empty,
seenBy: Set[Address] = Set.empty,
leader: Option[Address] = None) extends ClusterDomainEvent {
leader: Option[Address] = None,
roleLeaderMap: Map[String, Option[Address]] = Map.empty) extends ClusterDomainEvent {
/**
* Java API: get current member list.
@ -61,6 +62,28 @@ object ClusterEvent {
* Java API: get address of current leader, or null if none
*/
def getLeader: Address = leader orNull
/**
* All node roles in the cluster
*/
def allRoles: Set[String] = roleLeaderMap.keySet
/**
* Java API: All node roles in the cluster
*/
def getAllRoles: java.util.Set[String] =
scala.collection.JavaConverters.setAsJavaSetConverter(allRoles).asJava
/**
* get address of current leader, if any, within the role set
*/
def roleLeader(role: String): Option[Address] = roleLeaderMap.getOrElse(role, None)
/**
* Java API: get address of current leader within the role set,
* or null if no node with that role
*/
def getRoleLeader(role: String): Address = roleLeaderMap.get(role).flatten.orNull
}
/**
@ -107,6 +130,18 @@ object ClusterEvent {
def getLeader: Address = leader orNull
}
/**
* First member (leader) of the members within a role set changed.
* Published when the state change is first seen on a node.
*/
case class RoleLeaderChanged(role: String, leader: Option[Address]) extends ClusterDomainEvent {
/**
* Java API
* @return address of current leader, or null if none
*/
def getLeader: Address = leader orNull
}
/**
* A member is considered as unreachable by the failure detector.
*/
@ -184,9 +219,22 @@ object ClusterEvent {
/**
* INTERNAL API
*/
private[cluster] def diffLeader(oldGossip: Gossip, newGossip: Gossip): immutable.Seq[LeaderChanged] =
if (newGossip.leader != oldGossip.leader) List(LeaderChanged(newGossip.leader))
private[cluster] def diffLeader(oldGossip: Gossip, newGossip: Gossip): immutable.Seq[LeaderChanged] = {
val newLeader = newGossip.leader
if (newLeader != oldGossip.leader) List(LeaderChanged(newLeader))
else Nil
}
/**
* INTERNAL API
*/
private[cluster] def diffRolesLeader(oldGossip: Gossip, newGossip: Gossip): Set[RoleLeaderChanged] = {
for {
role ← (oldGossip.allRoles ++ newGossip.allRoles)
newLeader = newGossip.roleLeader(role)
if newLeader != oldGossip.roleLeader(role)
} yield RoleLeaderChanged(role, newLeader)
}
/**
* INTERNAL API
@ -242,7 +290,8 @@ private[cluster] final class ClusterDomainEventPublisher extends Actor with Acto
members = latestGossip.members,
unreachable = latestGossip.overview.unreachable,
seenBy = latestGossip.seenBy,
leader = latestGossip.leader)
leader = latestGossip.leader,
roleLeaderMap = latestGossip.allRoles.map(r ⇒ r -> latestGossip.roleLeader(r))(collection.breakOut))
receiver match {
case Some(ref) ⇒ ref ! state
case None ⇒ publish(state)
@ -275,6 +324,7 @@ private[cluster] final class ClusterDomainEventPublisher extends Actor with Acto
}
}
diffLeader(oldGossip, newGossip) foreach publish
diffRolesLeader(oldGossip, newGossip) foreach publish
// publish internal SeenState for testing purposes
diffSeen(oldGossip, newGossip) foreach publish
}