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DC reachability events #23245

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Martynas Mickevičius 2017-07-12 15:48:15 +03:00 • committed by Johan Andrén
parent 9c7e8d027a
commit 73d3c5db5d
6 changed files with 143 additions and 4 deletions
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53
akka-cluster/src/main/scala/akka/cluster/ClusterEvent.scala
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@ -244,6 +244,22 @@ object ClusterEvent {
*/
final case class ReachableMember(member: Member) extends ReachabilityEvent
/**
* Marker interface to facilitate subscription of
* both [[UnreachableDataCenter]] and [[ReachableDataCenter]].
*/
sealed trait DataCenterReachabilityEvent extends ClusterDomainEvent
/**
* A data center is considered as unreachable when any members from the data center are unreachable
*/
final case class UnreachableDataCenter(dataCenter: DataCenter) extends DataCenterReachabilityEvent
/**
* A data center is considered reachable when all members from the data center are reachable
*/
final case class ReachableDataCenter(dataCenter: DataCenter) extends DataCenterReachabilityEvent
/**
* INTERNAL API
* The nodes that have seen current version of the Gossip.
@ -289,6 +305,41 @@ object ClusterEvent {
}(collection.breakOut)
}
private def isReachable(state: MembershipState, oldUnreachableNodes: Set[UniqueAddress])(otherDc: DataCenter): Boolean = {
val unrelatedDcNodes = state.latestGossip.members.collect {
case m if m.dataCenter != otherDc && m.dataCenter != state.selfDc ⇒ m.uniqueAddress
}
val reachabilityForOtherDc = state.dcReachabilityWithoutObservationsWithin.remove(unrelatedDcNodes)
reachabilityForOtherDc.allUnreachable.filterNot(oldUnreachableNodes).isEmpty
}
/**
* INTERNAL API
*/
private[cluster] def diffUnreachableDataCenter(oldState: MembershipState, newState: MembershipState): immutable.Seq[UnreachableDataCenter] = {
if (newState eq oldState) Nil
else {
val otherDcs = (oldState.latestGossip.allDataCenters union newState.latestGossip.allDataCenters) - newState.selfDc
otherDcs.filterNot(isReachable(newState, oldState.dcReachability.allUnreachableOrTerminated)).map(UnreachableDataCenter)(collection.breakOut)
}
}
/**
* INTERNAL API
*/
private[cluster] def diffReachableDataCenter(oldState: MembershipState, newState: MembershipState): immutable.Seq[ReachableDataCenter] = {
if (newState eq oldState) Nil
else {
val otherDcs = (oldState.latestGossip.allDataCenters union newState.latestGossip.allDataCenters) - newState.selfDc
val oldUnreachableDcs = otherDcs.filterNot(isReachable(oldState, Set()))
val currentUnreachableDcs = otherDcs.filterNot(isReachable(newState, Set()))
(oldUnreachableDcs diff currentUnreachableDcs).map(ReachableDataCenter)(collection.breakOut)
}
}
/**
* INTERNAL API.
*/
@ -457,6 +508,8 @@ private[cluster] final class ClusterDomainEventPublisher extends Actor with Acto
diffMemberEvents(oldState, newState) foreach pub
diffUnreachable(oldState, newState) foreach pub
diffReachable(oldState, newState) foreach pub
diffUnreachableDataCenter(oldState, newState) foreach pub
diffReachableDataCenter(oldState, newState) foreach pub
diffLeader(oldState, newState) foreach pub
diffRolesLeader(oldState, newState) foreach pub
// publish internal SeenState for testing purposes