Hi

I have a 2 node akka cluster, which looses connection once every two days.
Often when the server i almost idle. We are still on akka 2.2.4, using
oracle java 1.8_25. Its a virtual servers running on vmware esx.
The application have been running fine for 3 years, but started with this a
few weeks ago.
Anyone have any ideas on were to start troubleshooting this?

My clusterconfig:
remote {
       log-sent-messages = on
       log-received-messages = on
       log-remote-lifecycle-events = off
       netty.tcp {
           port = 45000
     }
     watch-failure-detector.threshold = 15
   }

  cluster {
     log-info = on
        auto-down = on
        auto-join = on
        failure-detector {
                    threshold = 15
                    min-std-deviation = 500 ms
                    acceptable-heartbeat-pause = 20 s
                 }
        heartbeat-request {
            grace-period = 20 s
            expected-response-after = 10 s
            time-to-live = 60 s
        }
        use-dispatcher = cluster-dispatcher
    }
}

cluster-dispatcher {
     type = "Dispatcher"
     executor = "fork-join-executor"
        fork-join-executor {
        parallelism-min = 2
        parallelism-max = 4
     }
}


logoutput:
node1:
2015-01-24 03:30:02,242 [svarut-akka.actor.default-dispatcher-25] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(Timer(heartbeat-timer,HeartbeatTimer,true,0),Actor[akka://svarut/dea
dLetters],Actor[akka://svarut/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2Fsvarut%40193.161.171.182%3A53119-2#-1998086621])
2015-01-24 03:30:02,242 [svarut-akka.actor.default-dispatcher-25] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(Disassociated(Unknown),Actor[akka://svarut/deadLetters],Actor[akka:/
/svarut/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2Fsvarut%40193.161.171.182%3A53119-2#-1998086621])
2015-01-24 03:30:02,312 [svarut-akka.actor.default-dispatcher-24] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(DisassociateUnderlying(Unknown),Actor[akka://svarut/deadLetters],Act
or[akka://svarut/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2Fsvarut%40193.161.171.182%3A53119-2#-1998086621])
2015-01-24 03:30:02,312 [svarut-akka.actor.default-dispatcher-24] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(Timer(AckIdleTimer,AckIdleCheckTimer,true,0),Actor[akka://svarut/dea
dLetters],Actor[akka://svarut/system/endpointManager/endpointWriter-akka.tcp%3A%2F%2Fsvarut%40193.161.171.182%3A45000-1#1403595424])
2015-01-24 03:30:02,312 [svarut-akka.actor.default-dispatcher-24] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(Timer(AckIdleTimer,AckIdleCheckTimer,true,0),Actor[akka://svarut/dea
dLetters],Actor[akka://svarut/system/endpointManager/endpointWriter-akka.tcp%3A%2F%2Fsvarut%40193.161.171.182%3A45000-1#1403595424])
2015-01-24 03:30:02,312 [svarut-akka.actor.default-dispatcher-24] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(Timer(AckIdleTimer,AckIdleCheckTimer,true,0),Actor[akka://svarut/dea
dLetters],Actor[akka://svarut/system/endpointManager/endpointWriter-akka.tcp%3A%2F%2Fsvarut%40193.161.171.182%3A45000-1#1403595424])
2015-01-24 03:30:02,312 [svarut-akka.actor.default-dispatcher-24] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(TakeOver(akka.remote.transport.AkkaProtocolHandle@40711a86
),Actor[ak
ka://svarut/system/endpointManager#1220933312],Actor[akka://svarut/system/endpointManager/endpointWriter-akka.tcp%3A%2F%2Fsvarut%40193.161.171.182%3A45000-1#1403595424])
2015-01-24 03:30:27,666 [svarut-akka.actor.default-dispatcher-31] ERROR
a.c.ClusterCoreDaemon - Cluster Node [akka.tcp://
[email protected]:45000] - Marking node(s) as UNREACHABLE [Memb
er(address = akka.tcp://[email protected]:45000, status = Up)]
2015-01-24 03:30:28,504 [svarut-akka.actor.default-dispatcher-17] INFO
 Cluster(akka://svarut) - Cluster Node [akka.tcp://
[email protected]:45000] - Leader is marking unreachable node
[akka.tcp://[email protected]:45000] as [Down]
2015-01-24 03:30:28,506 [svarut-akka.actor.default-dispatcher-25] INFO
 Cluster(akka://svarut) - Cluster Node [akka.tcp://
[email protected]:45000] - Leader is removing unreachable node
 [akka.tcp://[email protected]:45000]

Node2:
2015-01-24 03:30:02,040 [svarut-akka.actor.default-dispatcher-12] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(DisassociateUnderlying(Unknown),Actor[akka://svarut/deadLetters],Act
or[akka://svarut/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2Fsvarut%40193.161.171.181%3A45000-3#72034903])
2015-01-24 03:30:02,042 [svarut-akka.actor.default-dispatcher-21] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(Disassociated(Unknown),Actor[akka://svarut/deadLetters],Actor[akka:/
/svarut/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2Fsvarut%40193.161.171.181%3A45000-3#72034903])
2015-01-24 03:30:28,636 [svarut-akka.actor.default-dispatcher-2] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(DisassociateUnderlying(Unknown),Actor[akka://svarut/deadLetters],Acto
r[akka://svarut/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2Fsvarut%40193.161.171.181%3A44793-4#-747477980])
2015-01-24 03:30:28,637 [svarut-akka.actor.default-dispatcher-18] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(Disassociated(Unknown),Actor[akka://svarut/deadLetters],Actor[akka:/
/svarut/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2Fsvarut%40193.161.171.181%3A44793-4#-747477980])
2015-01-24 03:30:41,457 [svarut-akka.actor.default-dispatcher-22] INFO
 Cluster(akka://svarut) - Cluster Node [akka.tcp://
[email protected]:45000] - Trigger extra expected heartbeat fr
om [akka.tcp://[email protected]:45000]
2015-01-24 03:31:06,471 [svarut-akka.actor.default-dispatcher-2] ERROR
a.c.ClusterCoreDaemon - Cluster Node [akka.tcp://
[email protected]:45000] - Marking node(s) as UNREACHABLE [Membe
r(address = akka.tcp://[email protected]:45000, status = Up)]
2015-01-24 03:31:07,445 [svarut-akka.actor.default-dispatcher-12] INFO
 Cluster(akka://svarut) - Cluster Node [akka.tcp://
[email protected]:45000] - Leader is marking unreachable node
[akka.tcp://[email protected]:45000] as [Down]
2015-01-24 03:31:07,446 [svarut-akka.actor.default-dispatcher-12] INFO
 Cluster(akka://svarut) - Cluster Node [akka.tcp://
[email protected]:45000] - Leader is removing unreachable node
 [akka.tcp://[email protected]:45000]
2015-01-24 03:31:07,446 [svarut-akka.actor.default-dispatcher-2] INFO
 Remoting - Address [akka.tcp://[email protected]:45000] is now
quarantined, all messages to this address will be
delivered to dead letters.
2015-01-24 03:31:07,516 [svarut-akka.actor.default-dispatcher-12] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(Disassociated(Unknown),Actor[akka://svarut/deadLetters],Actor[akka:/
/svarut/system/endpointManager/reliableEndpointWriter-akka.tcp%3A%2F%2Fsvarut%40193.161.171.181%3A45000-1/endpointWriter/endpointReader-akka.tcp%3A%2F%2Fsvarut%40193.161.171.181%3A45000-0#-
1902872711])
2015-01-24 03:31:07,517 [svarut-akka.actor.default-dispatcher-12] WARN
 n.k.e.DeadLetterLogger - Dead letter:
DeadLetter(Disassociated(Unknown),Actor[akka://svarut/deadLetters],Actor[akka:/
/svarut/system/transports/akkaprotocolmanager.tcp0/akkaProtocol-tcp%3A%2F%2Fsvarut%40193.161.171.181%3A45000-5#-2023131039])

-- 
Idar

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