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Cluster member age, and usage in singleton, see #3195

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* Assign internal upNumber when member is moved to Up
* Public API Member.isOlder
* Change cluster singleton to use oldest member instead of leader
* Update samples and docs
This commit is contained in:
Patrik Nordwall 2013-04-28 22:05:40 +02:00
parent 459e3e3720
commit b8b65c9153
17 changed files with 656 additions and 412 deletions
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33
akka-cluster/src/main/scala/akka/cluster/ClusterDaemon.scala
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@ -748,16 +748,29 @@ private[cluster] final class ClusterCoreDaemon(publisher: ActorRef) extends Acto
// transform the node member ring
val newMembers = localMembers collect {
// Move JOINING => UP (once all nodes have seen that this node is JOINING, i.e. we have a convergence)
// and minimum number of nodes have joined the cluster
case member if isJoiningToUp(member) ⇒ member copy (status = Up)
// Move LEAVING => EXITING (once we have a convergence on LEAVING
// *and* if we have a successful partition handoff)
case member if member.status == Leaving && hasPartionHandoffCompletedSuccessfully ⇒
member copy (status = Exiting)
// Everyone else that is not Exiting stays as they are
case member if member.status != Exiting && member.status != Down ⇒ member
// Move EXITING => REMOVED, DOWN => REMOVED - i.e. remove the nodes from the `members` set/node ring and seen table
var upNumber = 0
{
// Move JOINING => UP (once all nodes have seen that this node is JOINING, i.e. we have a convergence)
// and minimum number of nodes have joined the cluster
case member if isJoiningToUp(member) ⇒
if (upNumber == 0) {
// It is alright to use same upNumber as already used by a removed member, since the upNumber
// is only used for comparing age of current cluster members (Member.isOlderThan)
val youngest = localGossip.youngestMember
upNumber = 1 + (if (youngest.upNumber == Int.MaxValue) 0 else youngest.upNumber)
} else {
upNumber += 1
}
member.copyUp(upNumber)
// Move LEAVING => EXITING (once we have a convergence on LEAVING
// *and* if we have a successful partition handoff)
case member if member.status == Leaving && hasPartionHandoffCompletedSuccessfully ⇒
member copy (status = Exiting)
// Everyone else that is not Exiting stays as they are
case member if member.status != Exiting && member.status != Down ⇒ member
// Move EXITING => REMOVED, DOWN => REMOVED - i.e. remove the nodes from the `members` set/node ring and seen table
}
}
// ----------------------