Re: [akka-user] Re: Clarification on unreachable nodes in cluster

[Guido Medina]

I have a supervisor actor per node which is already subscribed to cluster 
events,
I avoided using ask when the actor system is going down anyway and it is 
driven by the JVM shutdown hook,
so instead I came up with this hack, maybe a bit ugly but it works:

For supervisor actor which once it receives MemberRemoved for itself it 
terminates the actor system:
  if (message instanceof MemberRemoved) {
final Member member = ((MemberRemoved) message).member();
final ActorSystem system = context().system();
if (Cluster.get(system).selfAddress().equals(member.address())) {
  // It was me that left so, terminate actor system.
  system.terminate();
} else {
  // Invalidates that other supervisor cache that left.
  removeSupervisor(member);
}
  }

For main class which once the system is shutdown it also shutdowns the 
logger manager:
  public static void registerShutdownHook(ActorSystem system) {
final CountDownLatch latch = new CountDownLatch(1);
system.registerOnTermination(() -> {
  try {
Configurator.shutdown((LoggerContext) LogManager.getContext());
  } finally {
latch.countDown();
  }
});
Runtime.getRuntime().addShutdownHook(new Thread() {
  @Override
  public void run() {
final Cluster cluster = Cluster.get(system);
cluster.leave(cluster.selfAddress());
try {
  latch.await();
} catch (InterruptedException ignored) {
}
  }
});
  }

Regards,

Guido.

-- 
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Re: [akka-user] Re: Clarification on unreachable nodes in cluster

[Guido Medina]

You could if system.terminate() could do that for you as part of the 
cluster extension then I could simply Await for Future to be 
ready.

On Monday, March 21, 2016 at 9:36:43 AM UTC, Akka Team wrote:
>
> But then you cannot expect a graceful removal from the cluster. 
>
> -Endre
>
> On Fri, Mar 18, 2016 at 6:47 PM, Guido Medina  > wrote:
>
>> Won't happen, the micro-services are being sent Linux SIGTERM, which is 
>> why I'm hooking on the JVM shutdown.
>>
>> On Friday, March 18, 2016 at 5:26:01 PM UTC, Konrad Malawski wrote:
>>>
>>> I precisely explained for what event you need to wait :-)
>>>
>>> Proper graceful shutdown means you need to wait for *_your own_ address* 
>>> to come back as *MemberRemoved* event,
>>> and THEN you can shut down the actor system and JVM.
>>>
>>>
>>> -- 
>>> Cheers,
>>> Konrad 'ktoso’ Malawski
>>> Akka  @ Lightbend 
>>>
>> -- 
>> >> Read the docs: http://akka.io/docs/
>> >> Check the FAQ: 
>> http://doc.akka.io/docs/akka/current/additional/faq.html
>> >> Search the archives: https://groups.google.com/group/akka-user
>> --- 
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>>
>
>
>
> -- 
> Akka Team
> Typesafe - Reactive apps on the JVM
> Blog: letitcrash.com
> Twitter: @akkateam
>

-- 
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Re: [akka-user] Re: Clarification on unreachable nodes in cluster

[Akka Team]

But then you cannot expect a graceful removal from the cluster.

-Endre

On Fri, Mar 18, 2016 at 6:47 PM, Guido Medina  wrote:

> Won't happen, the micro-services are being sent Linux SIGTERM, which is
> why I'm hooking on the JVM shutdown.
>
> On Friday, March 18, 2016 at 5:26:01 PM UTC, Konrad Malawski wrote:
>>
>> I precisely explained for what event you need to wait :-)
>>
>> Proper graceful shutdown means you need to wait for *_your own_ address*
>> to come back as *MemberRemoved* event,
>> and THEN you can shut down the actor system and JVM.
>>
>>
>> --
>> Cheers,
>> Konrad 'ktoso’ Malawski
>> Akka  @ Lightbend 
>>
> --
> >> Read the docs: http://akka.io/docs/
> >> Check the FAQ:
> http://doc.akka.io/docs/akka/current/additional/faq.html
> >> Search the archives: https://groups.google.com/group/akka-user
> ---
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>



-- 
Akka Team
Typesafe - Reactive apps on the JVM
Blog: letitcrash.com
Twitter: @akkateam

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Re: [akka-user] Re: Clarification on unreachable nodes in cluster

[Guido Medina]

How long is enough time? I tried sleep 1 sec between leave and terminate 
calls and it didn't work.

On Friday, March 18, 2016 at 5:13:50 PM UTC, Konrad Malawski wrote:
>
> Also, please don't do that:
>cluster.leave(cluster.selfAddress());
> system.terminate();
> It is wrong.
>
> You need to give the cluster gossip enough time to complete the leaving 
> "nicely".
>
> Proper graceful shutdown means you need to wait for _your own_ address to 
> come back as MemberRemoved event,
> and THEN you can shut down the actor system and JVM.
>
> Related: 
> this mistake is exactly something I warn against in my recent talk "Zen of 
> Akka", you may enjoy it :-)
> https://youtu.be/tC-joPMPJLs
>
>
>
> On Fri, Mar 18, 2016 at 5:58 PM, Patrik Nordwall  > wrote:
>
> Hi Ben
>
> There are some subtle exceptions to the convergence rule. Unreachable 
> members with status Down or Exiting are not counted.
>
> /Patrik
>
> On Thu, Mar 17, 2016 at 11:25 PM, Guido Medina  > wrote:
>
> In fact in the other nodes you get the following:
>
> INFO  22:10:20,383 ster) - Cluster Node [akka.tcp://
> DevCluster@127.0.0.1:2552] - Leader is moving node [akka.tcp://
> DevCluster@127.0.0.1:38845] to [Exiting]
> INFO  22:10:20,384 orRef - Message [akka.cluster.GossipEnvelope] from 
> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to 
> Actor[akka://DevCluster/deadLetters] was not delivered. [1] dead letters 
> encountered. This logging can be turned off or adjusted with configuration 
> settings 'akka.log-dead-letters' and 
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:20,403 orRef - Message [akka.cluster.
> ClusterHeartbeatSender$Heartbeat] from 
> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
>  
> to Actor[akka://DevCluster/deadLetters] was not delivered. [2] dead letters 
> encountered. This logging can be turned off or adjusted with configuration 
> settings 'akka.log-dead-letters' and 
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:21,383 orRef - Message [akka.cluster.GossipEnvelope] from 
> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to 
> Actor[akka://DevCluster/deadLetters] was not delivered. [3] dead letters 
> encountered. This logging can be turned off or adjusted with configuration 
> settings 'akka.log-dead-letters' and 
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:21,403 orRef - Message [akka.cluster.
> ClusterHeartbeatSender$Heartbeat] from 
> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
>  
> to Actor[akka://DevCluster/deadLetters] was not delivered. [4] dead letters 
> encountered. This logging can be turned off or adjusted with configuration 
> settings 'akka.log-dead-letters' and 
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:22,383 orRef - Message [akka.cluster.GossipEnvelope] from 
> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to 
> Actor[akka://DevCluster/deadLetters] was not delivered. [5] dead letters 
> encountered. This logging can be turned off or adjusted with configuration 
> settings 'akka.log-dead-letters' and 
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:22,403 orRef - Message [akka.cluster.
> ClusterHeartbeatSender$Heartbeat] from 
> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
>  
> to Actor[akka://DevCluster/deadLetters] was not delivered. [6] dead letters 
> encountered. This logging can be turned off or adjusted with configuration 
> settings 'akka.log-dead-letters' and 
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:23,383 orRef - Message [akka.cluster.GossipEnvelope] from 
> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to 
> Actor[akka://DevCluster/deadLetters] was not delivered. [7] dead letters 
> encountered. This logging can be turned off or adjusted with configuration 
> settings 'akka.log-dead-letters' and 
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:23,403 orRef - Message [akka.cluster.
> ClusterHeartbeatSender$Heartbeat] from 
> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
>  
> to Actor[akka://DevCluster/deadLetters] was not delivered. [8] dead letters 
> encountered. This logging can be turned off or adjusted with configuration 
> settings 'akka.log-dead-letters' and 
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:24,382 orRef - Message [akka.cluster.GossipEnvelope] from 
> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to 
> Actor[akka://DevCluster/deadLetters] was not delivered. [9] dead letters 
> encountered. This logging can be turned off or adjusted with configuration 
> settings 'akka.log-dead-letters' and 
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:24,384 ster) - Cluster Node [akka.tcp://
> DevCluster@127.0.0.1:2552] - Marking exiting node(s) as UNREACHABLE 
> [Member(address = 

Re: [akka-user] Re: Clarification on unreachable nodes in cluster

[Konrad Malawski]

Also, please don't do that:
   cluster.leave(cluster.selfAddress());
system.terminate();
It is wrong.

You need to give the cluster gossip enough time to complete the leaving
"nicely".

Proper graceful shutdown means you need to wait for _your own_ address to
come back as MemberRemoved event,
and THEN you can shut down the actor system and JVM.

Related:
this mistake is exactly something I warn against in my recent talk "Zen of
Akka", you may enjoy it :-)
https://youtu.be/tC-joPMPJLs



On Fri, Mar 18, 2016 at 5:58 PM, Patrik Nordwall 
wrote:

> Hi Ben
>
> There are some subtle exceptions to the convergence rule. Unreachable
> members with status Down or Exiting are not counted.
>
> /Patrik
>
> On Thu, Mar 17, 2016 at 11:25 PM, Guido Medina  wrote:
>
>> In fact in the other nodes you get the following:
>>
>> INFO  22:10:20,383 ster) - Cluster Node [akka.tcp://
>> DevCluster@127.0.0.1:2552] - Leader is moving node [akka.tcp://
>> DevCluster@127.0.0.1:38845] to [Exiting]
>> INFO  22:10:20,384 orRef - Message [akka.cluster.GossipEnvelope] from
>> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to
>> Actor[akka://DevCluster/deadLetters] was not delivered. [1] dead letters
>> encountered. This logging can be turned off or adjusted with configuration
>> settings 'akka.log-dead-letters' and
>> 'akka.log-dead-letters-during-shutdown'.
>> INFO  22:10:20,403 orRef - Message [akka.cluster.
>> ClusterHeartbeatSender$Heartbeat] from 
>> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
>> to Actor[akka://DevCluster/deadLetters] was not delivered. [2] dead letters
>> encountered. This logging can be turned off or adjusted with configuration
>> settings 'akka.log-dead-letters' and
>> 'akka.log-dead-letters-during-shutdown'.
>> INFO  22:10:21,383 orRef - Message [akka.cluster.GossipEnvelope] from
>> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to
>> Actor[akka://DevCluster/deadLetters] was not delivered. [3] dead letters
>> encountered. This logging can be turned off or adjusted with configuration
>> settings 'akka.log-dead-letters' and
>> 'akka.log-dead-letters-during-shutdown'.
>> INFO  22:10:21,403 orRef - Message [akka.cluster.
>> ClusterHeartbeatSender$Heartbeat] from 
>> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
>> to Actor[akka://DevCluster/deadLetters] was not delivered. [4] dead letters
>> encountered. This logging can be turned off or adjusted with configuration
>> settings 'akka.log-dead-letters' and
>> 'akka.log-dead-letters-during-shutdown'.
>> INFO  22:10:22,383 orRef - Message [akka.cluster.GossipEnvelope] from
>> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to
>> Actor[akka://DevCluster/deadLetters] was not delivered. [5] dead letters
>> encountered. This logging can be turned off or adjusted with configuration
>> settings 'akka.log-dead-letters' and
>> 'akka.log-dead-letters-during-shutdown'.
>> INFO  22:10:22,403 orRef - Message [akka.cluster.
>> ClusterHeartbeatSender$Heartbeat] from 
>> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
>> to Actor[akka://DevCluster/deadLetters] was not delivered. [6] dead letters
>> encountered. This logging can be turned off or adjusted with configuration
>> settings 'akka.log-dead-letters' and
>> 'akka.log-dead-letters-during-shutdown'.
>> INFO  22:10:23,383 orRef - Message [akka.cluster.GossipEnvelope] from
>> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to
>> Actor[akka://DevCluster/deadLetters] was not delivered. [7] dead letters
>> encountered. This logging can be turned off or adjusted with configuration
>> settings 'akka.log-dead-letters' and
>> 'akka.log-dead-letters-during-shutdown'.
>> INFO  22:10:23,403 orRef - Message [akka.cluster.
>> ClusterHeartbeatSender$Heartbeat] from 
>> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
>> to Actor[akka://DevCluster/deadLetters] was not delivered. [8] dead letters
>> encountered. This logging can be turned off or adjusted with configuration
>> settings 'akka.log-dead-letters' and
>> 'akka.log-dead-letters-during-shutdown'.
>> INFO  22:10:24,382 orRef - Message [akka.cluster.GossipEnvelope] from
>> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to
>> Actor[akka://DevCluster/deadLetters] was not delivered. [9] dead letters
>> encountered. This logging can be turned off or adjusted with configuration
>> settings 'akka.log-dead-letters' and
>> 'akka.log-dead-letters-during-shutdown'.
>> INFO  22:10:24,384 ster) - Cluster Node [akka.tcp://
>> DevCluster@127.0.0.1:2552] - Marking exiting node(s) as UNREACHABLE
>> [Member(address = akka.tcp://DevCluster@127.0.0.1:38845, status =
>> Exiting)]. This is expected and they will be removed.
>> INFO  22:10:24,403 orRef - Message [akka.cluster.
>> ClusterHeartbeatSender$Heartbeat] from 
>> 

Re: [akka-user] Re: Clarification on unreachable nodes in cluster

[Patrik Nordwall]

Hi Ben

There are some subtle exceptions to the convergence rule. Unreachable
members with status Down or Exiting are not counted.

/Patrik

On Thu, Mar 17, 2016 at 11:25 PM, Guido Medina  wrote:

> In fact in the other nodes you get the following:
>
> INFO  22:10:20,383 ster) - Cluster Node [akka.tcp://
> DevCluster@127.0.0.1:2552] - Leader is moving node [akka.tcp://
> DevCluster@127.0.0.1:38845] to [Exiting]
> INFO  22:10:20,384 orRef - Message [akka.cluster.GossipEnvelope] from
> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to
> Actor[akka://DevCluster/deadLetters] was not delivered. [1] dead letters
> encountered. This logging can be turned off or adjusted with configuration
> settings 'akka.log-dead-letters' and
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:20,403 orRef - Message [akka.cluster.
> ClusterHeartbeatSender$Heartbeat] from 
> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
> to Actor[akka://DevCluster/deadLetters] was not delivered. [2] dead letters
> encountered. This logging can be turned off or adjusted with configuration
> settings 'akka.log-dead-letters' and
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:21,383 orRef - Message [akka.cluster.GossipEnvelope] from
> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to
> Actor[akka://DevCluster/deadLetters] was not delivered. [3] dead letters
> encountered. This logging can be turned off or adjusted with configuration
> settings 'akka.log-dead-letters' and
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:21,403 orRef - Message [akka.cluster.
> ClusterHeartbeatSender$Heartbeat] from 
> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
> to Actor[akka://DevCluster/deadLetters] was not delivered. [4] dead letters
> encountered. This logging can be turned off or adjusted with configuration
> settings 'akka.log-dead-letters' and
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:22,383 orRef - Message [akka.cluster.GossipEnvelope] from
> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to
> Actor[akka://DevCluster/deadLetters] was not delivered. [5] dead letters
> encountered. This logging can be turned off or adjusted with configuration
> settings 'akka.log-dead-letters' and
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:22,403 orRef - Message [akka.cluster.
> ClusterHeartbeatSender$Heartbeat] from 
> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
> to Actor[akka://DevCluster/deadLetters] was not delivered. [6] dead letters
> encountered. This logging can be turned off or adjusted with configuration
> settings 'akka.log-dead-letters' and
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:23,383 orRef - Message [akka.cluster.GossipEnvelope] from
> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to
> Actor[akka://DevCluster/deadLetters] was not delivered. [7] dead letters
> encountered. This logging can be turned off or adjusted with configuration
> settings 'akka.log-dead-letters' and
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:23,403 orRef - Message [akka.cluster.
> ClusterHeartbeatSender$Heartbeat] from 
> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
> to Actor[akka://DevCluster/deadLetters] was not delivered. [8] dead letters
> encountered. This logging can be turned off or adjusted with configuration
> settings 'akka.log-dead-letters' and
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:24,382 orRef - Message [akka.cluster.GossipEnvelope] from
> Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to
> Actor[akka://DevCluster/deadLetters] was not delivered. [9] dead letters
> encountered. This logging can be turned off or adjusted with configuration
> settings 'akka.log-dead-letters' and
> 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:24,384 ster) - Cluster Node [akka.tcp://
> DevCluster@127.0.0.1:2552] - Marking exiting node(s) as UNREACHABLE
> [Member(address = akka.tcp://DevCluster@127.0.0.1:38845, status =
> Exiting)]. This is expected and they will be removed.
> INFO  22:10:24,403 orRef - Message [akka.cluster.
> ClusterHeartbeatSender$Heartbeat] from 
> Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769]
> to Actor[akka://DevCluster/deadLetters] was not delivered. [10] dead
> letters encountered, no more dead letters will be logged. This logging can
> be turned off or adjusted with configuration settings
> 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
> INFO  22:10:25,387 ster) - Cluster Node [akka.tcp://
> DevCluster@127.0.0.1:2552] - Leader is removing exiting node [akka.tcp://
> DevCluster@127.0.0.1:38845]
>
> Notice the 1st status is [Exiting], then you see from [Exiting] to
> [Unreachable] and then you get [MemberRemoved] which isn't logged by Akka
> but I can assure you it happens, and 

Re: [akka-user] Re: Clarification on unreachable nodes in cluster

[Guido Medina]

Won't happen, the micro-services are being sent Linux SIGTERM, which is why 
I'm hooking on the JVM shutdown.

On Friday, March 18, 2016 at 5:26:01 PM UTC, Konrad Malawski wrote:
>
> I precisely explained for what event you need to wait :-)
>
> Proper graceful shutdown means you need to wait for *_your own_ address* 
> to come back as *MemberRemoved* event,
> and THEN you can shut down the actor system and JVM.
>
>
> -- 
> Cheers,
> Konrad 'ktoso’ Malawski
> Akka  @ Lightbend 
>

-- 
>>  Read the docs: http://akka.io/docs/
>>  Check the FAQ: 
>> http://doc.akka.io/docs/akka/current/additional/faq.html
>>  Search the archives: https://groups.google.com/group/akka-user
--- 
You received this message because you are subscribed to the Google Groups "Akka 
User List" group.
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For more options, visit https://groups.google.com/d/optout.

Re: [akka-user] Re: Clarification on unreachable nodes in cluster

[Konrad Malawski]

I precisely explained for what event you need to wait :-)

Proper graceful shutdown means you need to wait for _your own_ address to come 
back as MemberRemoved event,
and THEN you can shut down the actor system and JVM.

-- 
Cheers,
Konrad 'ktoso’ Malawski
Akka @ Lightbend

On 18 March 2016 at 18:24:58, Guido Medina (oxyg...@gmail.com) wrote:

How long is enough time? I tried sleep 1 sec between leave and terminate calls 
and it didn't work.

On Friday, March 18, 2016 at 5:13:50 PM UTC, Konrad Malawski wrote:
Also, please don't do that:
       cluster.leave(cluster.selfAddress());
        system.terminate();
It is wrong.

You need to give the cluster gossip enough time to complete the leaving 
"nicely".

Proper graceful shutdown means you need to wait for _your own_ address to come 
back as MemberRemoved event,
and THEN you can shut down the actor system and JVM.

Related: 
this mistake is exactly something I warn against in my recent talk "Zen of 
Akka", you may enjoy it :-)
https://youtu.be/tC-joPMPJLs



On Fri, Mar 18, 2016 at 5:58 PM, Patrik Nordwall  wrote:
Hi Ben

There are some subtle exceptions to the convergence rule. Unreachable members 
with status Down or Exiting are not counted.

/Patrik

On Thu, Mar 17, 2016 at 11:25 PM, Guido Medina  wrote:
In fact in the other nodes you get the following:

INFO  22:10:20,383 ster) - Cluster Node [akka.tcp://DevCluster@127.0.0.1:2552] 
- Leader is moving node [akka.tcp://DevCluster@127.0.0.1:38845] to [Exiting]
INFO  22:10:20,384 orRef - Message [akka.cluster.GossipEnvelope] from 
Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to 
Actor[akka://DevCluster/deadLetters] was not delivered. [1] dead letters 
encountered. This logging can be turned off or adjusted with configuration 
settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
INFO  22:10:20,403 orRef - Message 
[akka.cluster.ClusterHeartbeatSender$Heartbeat] from 
Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769] 
to Actor[akka://DevCluster/deadLetters] was not delivered. [2] dead letters 
encountered. This logging can be turned off or adjusted with configuration 
settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
INFO  22:10:21,383 orRef - Message [akka.cluster.GossipEnvelope] from 
Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to 
Actor[akka://DevCluster/deadLetters] was not delivered. [3] dead letters 
encountered. This logging can be turned off or adjusted with configuration 
settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
INFO  22:10:21,403 orRef - Message 
[akka.cluster.ClusterHeartbeatSender$Heartbeat] from 
Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769] 
to Actor[akka://DevCluster/deadLetters] was not delivered. [4] dead letters 
encountered. This logging can be turned off or adjusted with configuration 
settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
INFO  22:10:22,383 orRef - Message [akka.cluster.GossipEnvelope] from 
Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to 
Actor[akka://DevCluster/deadLetters] was not delivered. [5] dead letters 
encountered. This logging can be turned off or adjusted with configuration 
settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
INFO  22:10:22,403 orRef - Message 
[akka.cluster.ClusterHeartbeatSender$Heartbeat] from 
Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769] 
to Actor[akka://DevCluster/deadLetters] was not delivered. [6] dead letters 
encountered. This logging can be turned off or adjusted with configuration 
settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
INFO  22:10:23,383 orRef - Message [akka.cluster.GossipEnvelope] from 
Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to 
Actor[akka://DevCluster/deadLetters] was not delivered. [7] dead letters 
encountered. This logging can be turned off or adjusted with configuration 
settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
INFO  22:10:23,403 orRef - Message 
[akka.cluster.ClusterHeartbeatSender$Heartbeat] from 
Actor[akka://DevCluster/system/cluster/core/daemon/heartbeatSender#1423910769] 
to Actor[akka://DevCluster/deadLetters] was not delivered. [8] dead letters 
encountered. This logging can be turned off or adjusted with configuration 
settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
INFO  22:10:24,382 orRef - Message [akka.cluster.GossipEnvelope] from 
Actor[akka://DevCluster/system/cluster/core/daemon#1435915897] to 
Actor[akka://DevCluster/deadLetters] was not delivered. [9] dead letters 
encountered. This logging can be turned off or adjusted with configuration 
settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
INFO  22:10:24,384 ster) - Cluster