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Cluster node roles, see #3049

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* 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
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50
akka-cluster/src/main/scala/akka/cluster/ClusterDaemon.scala
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@ -37,7 +37,7 @@ object ClusterUserAction {
* Command to join the cluster. Sent when a node (represented by 'address')
* wants to join another node (the receiver).
*/
case class Join(address: Address) extends ClusterMessage
case class Join(address: Address, roles: Set[String]) extends ClusterMessage
/**
* Command to leave the cluster.
@ -288,20 +288,20 @@ private[cluster] final class ClusterCoreDaemon(publisher: ActorRef) extends Acto
}
def initialized: Actor.Receive = {
case msg: GossipEnvelope ⇒ receiveGossip(msg)
case GossipTick ⇒ gossip()
case ReapUnreachableTick ⇒ reapUnreachableMembers()
case LeaderActionsTick ⇒ leaderActions()
case PublishStatsTick ⇒ publishInternalStats()
case InitJoin ⇒ initJoin()
case JoinTo(address) ⇒ join(address)
case ClusterUserAction.Join(address) ⇒ joining(address)
case ClusterUserAction.Down(address) ⇒ downing(address)
case ClusterUserAction.Leave(address) ⇒ leaving(address)
case Exit(address) ⇒ exiting(address)
case Remove(address) ⇒ removing(address)
case SendGossipTo(address) ⇒ gossipTo(address)
case msg: SubscriptionMessage ⇒ publisher forward msg
case msg: GossipEnvelope ⇒ receiveGossip(msg)
case GossipTick ⇒ gossip()
case ReapUnreachableTick ⇒ reapUnreachableMembers()
case LeaderActionsTick ⇒ leaderActions()
case PublishStatsTick ⇒ publishInternalStats()
case InitJoin ⇒ initJoin()
case JoinTo(address) ⇒ join(address)
case ClusterUserAction.Join(address, roles) ⇒ joining(address, roles)
case ClusterUserAction.Down(address) ⇒ downing(address)
case ClusterUserAction.Leave(address) ⇒ leaving(address)
case Exit(address) ⇒ exiting(address)
case Remove(address) ⇒ removing(address)
case SendGossipTo(address) ⇒ gossipTo(address)
case msg: SubscriptionMessage ⇒ publisher forward msg
}
@ -366,16 +366,16 @@ private[cluster] final class ClusterCoreDaemon(publisher: ActorRef) extends Acto
context.become(initialized)
if (address == selfAddress)
joining(address)
joining(address, cluster.selfRoles)
else
clusterCore(address) ! ClusterUserAction.Join(selfAddress)
clusterCore(address) ! ClusterUserAction.Join(selfAddress, cluster.selfRoles)
}
}
/**
* State transition to JOINING - new node joining.
*/
def joining(node: Address): Unit = {
def joining(node: Address, roles: Set[String]): Unit = {
if (node.protocol != selfAddress.protocol)
log.warning("Member with wrong protocol tried to join, but was ignored, expected [{}] but was [{}]",
selfAddress.protocol, node.protocol)
@ -396,7 +396,7 @@ private[cluster] final class ClusterCoreDaemon(publisher: ActorRef) extends Acto
// add joining node as Joining
// add self in case someone else joins before self has joined (Set discards duplicates)
val newMembers = localMembers + Member(node, Joining) + Member(selfAddress, Joining)
val newMembers = localMembers + Member(node, Joining, roles) + Member(selfAddress, Joining, cluster.selfRoles)
val newGossip = latestGossip copy (members = newMembers)
val versionedGossip = newGossip :+ vclockNode
@ -404,7 +404,7 @@ private[cluster] final class ClusterCoreDaemon(publisher: ActorRef) extends Acto
latestGossip = seenVersionedGossip
log.info("Cluster Node [{}] - Node [{}] is JOINING", selfAddress, node)
log.info("Cluster Node [{}] - Node [{}] is JOINING, roles [{}]", selfAddress, node, roles.mkString(", "))
if (node != selfAddress) {
gossipTo(node)
}
@ -419,7 +419,7 @@ private[cluster] final class ClusterCoreDaemon(publisher: ActorRef) extends Acto
*/
def leaving(address: Address): Unit = {
if (latestGossip.members.exists(_.address == address)) { // only try to update if the node is available (in the member ring)
val newMembers = latestGossip.members map { member ⇒ if (member.address == address) Member(address, Leaving) else member } // mark node as LEAVING
val newMembers = latestGossip.members map { m ⇒ if (m.address == address) m.copy(status = Leaving) else m } // mark node as LEAVING
val newGossip = latestGossip copy (members = newMembers)
val versionedGossip = newGossip :+ vclockNode
@ -636,8 +636,12 @@ private[cluster] final class ClusterCoreDaemon(publisher: ActorRef) extends Acto
if (localGossip.convergence) {
// we have convergence - so we can't have unreachable nodes
val numberOfMembers = localMembers.size
def isJoiningToUp(m: Member): Boolean = m.status == Joining && numberOfMembers >= MinNrOfMembers
def enoughMembers: Boolean = {
localMembers.size >= MinNrOfMembers && MinNrOfMembersOfRole.forall {
case (role, threshold) ⇒ localMembers.count(_.hasRole(role)) >= threshold
}
}
def isJoiningToUp(m: Member): Boolean = m.status == Joining && enoughMembers
// transform the node member ring
val newMembers = localMembers collect {