I've created the issue here: https://github.com/akka/akka/issues/21240

Chris

On Sun, Aug 21, 2016 at 3:28 AM, Endre Varga <endre.va...@lightbend.com>
wrote:

> Hi Chris,
>
> Thank you for all this, very valuable information! Can you please file a
> ticket on the repo for further discussions to not have this accidentally
> lost?
>
> -Endre
>
> On Sun, Aug 21, 2016 at 1:06 AM, Chris Van Vranken <
> cessationoft...@gmail.com> wrote:
>
>> Someone responded to me in the hyperic sigar issue. Apparently this is
>> implemented in the Boundary fork of sigar: https://github.com/boun
>> dary/sigar
>>
>> On Sat, Aug 20, 2016 at 4:29 PM, Chris Van Vranken <
>> cessationoft...@gmail.com> wrote:
>>
>>> In the Sigar repository there is a comment in file:
>>> src/os/win32/win32_sigar.c, for function sigar_loadavg_get which says
>>> "there is no api for this info. closest i've seen is enumerating the entire
>>> process table and calculating an average based on process times."
>>>
>>> Based on this comment it seems unlikely the issue will be resolved any
>>> time soon, if it gets fixed at all. So I think the verifiedSigarInstance
>>> function that ClusterMetrics calls should be changed so that the 
>>> getLoadAverage
>>> function is not called when running on Windows, otherwise Sigar will be
>>> unuseable there.
>>>
>>> On Sat, Aug 20, 2016 at 4:06 PM, Chris Van Vranken <
>>> cessationoft...@gmail.com> wrote:
>>>
>>>> I found an issue <https://github.com/hyperic/sigar/issues/72> for this
>>>> listed in the hyperic/sigar github repo.
>>>>
>>>> On Sat, Aug 20, 2016 at 3:12 PM, Chris Van Vranken <
>>>> cessationoft...@gmail.com> wrote:
>>>>
>>>>> I found the problem:
>>>>>
>>>>> In file:  akka-cluster-metrics/src/main/scala/akka/cluster/metrics/Pr
>>>>> ovision.scala
>>>>>
>>>>> def verifiedSigarInstance: SigarProxy = {
>>>>>> val sigar = new Sigar()
>>>>>> sigar.getPid
>>>>>> sigar.getLoadAverage
>>>>>> sigar.getCpuPerc
>>>>>> sigar
>>>>>> }
>>>>>
>>>>>
>>>>> def verifiedSigarInstance will always throws an exception when it
>>>>> attempts to run sigar.getLoadAvarage. This causes the ClusterMetrics
>>>>> extension to repeatedly attempt to provision sigar, but it never succeeds.
>>>>> Apparently getLoadAverage simply isn't implemented for this OS in 
>>>>> "sigar-loader"
>>>>> % "1.6.6-rev002" which is the most recent version available and the 
>>>>> version
>>>>> referenced in the cluster metrics documentation.
>>>>>
>>>>> Running a simple program with the following code will reproduce the
>>>>> error under Windows 10 (possibly under Windows 7 too, I had trouble there
>>>>> some months back)
>>>>>
>>>>> import java.io.File; import org.hyperic.sigar.Sigar; import
>>>>>> kamon.sigar.SigarProvisioner; object ExampleMain extends App {
>>>>>> SigarProvisioner.provision(); val sigar = new Sigar() val loadAverage =
>>>>>> sigar.getLoadAverage
>>>>>
>>>>> }
>>>>>>
>>>>>
>>>>> The exception is:
>>>>>
>>>>> Aug 20, 2016 2:52:59 PM kamon.sigar.SigarProvisioner discoverLocation
>>>>> INFO: Using location provided by hard coded value. Aug 20, 2016 2:52:59 PM
>>>>> kamon.sigar.SigarProvisioner provision INFO: Sigar library provisioned:
>>>>> C:\Users\cvanvranken\gits\Example\main\server-metrics\native\sigar-amd64-winnt.dll
>>>>> Exception in thread "main" org.hyperic.sigar.SigarNotImplementedException:
>>>>> This method has not been implemented on this platform at
>>>>> org.hyperic.sigar.SigarNotImplementedException.<clinit>(Siga
>>>>> rNotImplementedException.java:28) at 
>>>>> org.hyperic.sigar.Sigar.getLoadAverage(Native
>>>>> Method)
>>>>>
>>>>> On Sat, Aug 20, 2016 at 1:12 PM, Chris Van Vranken <
>>>>> cessationoft...@gmail.com> wrote:
>>>>>
>>>>>> I bet akka.cluster.metrics.native-library-extract-folder isn't
>>>>>> configured properly.
>>>>>>
>>>>>> On Sat, Aug 20, 2016 at 1:00 PM, Chris Van Vranken <
>>>>>> cessationoft...@gmail.com> wrote:
>>>>>>
>>>>>>> One thing that I've noticed is it seems to startup as JMX. But then
>>>>>>> it subsequently provisions Sigar. Though the provision is logged as an
>>>>>>> error message.
>>>>>>>
>>>>>>> The log output looks like this:
>>>>>>>
>>>>>>> > runMain sample.cluster.factorial.FactorialApp
>>>>>>> [warn] Scala version was updated by one of library dependencies:
>>>>>>> [warn]  * org.scala-lang:scala-library:2.11.7 -> 2.11.8
>>>>>>> [warn] To force scalaVersion, add the following:
>>>>>>> [warn]  ivyScala := ivyScala.value map { _.copy(overrideScalaVersion
>>>>>>> = true) }
>>>>>>> [warn] Run 'evicted' to see detailed eviction warnings
>>>>>>> [info] Running sample.cluster.factorial.FactorialApp
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.497] [main]
>>>>>>> [akka.remote.Remoting] Starting remoting
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.684] [main]
>>>>>>> [akka.remote.Remoting] Remoting started; listening on addresses
>>>>>>> :[akka.tcp://ClusterSystem@127.0.0.1:2551]
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.700] [main]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] - Starting up...
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.778] [main]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] - Registered cluster JMX
>>>>>>> MBean [akka:type=Cluster]
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.778] [main]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] - Started up successfully
>>>>>>> [error] Aug 20, 2016 12:45:17 PM kamon.sigar.SigarProvisioner
>>>>>>> provision
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.825] [main]
>>>>>>> [akka.remote.Remoting] Starting remoting
>>>>>>> [error] WARNING: Sigar library is already provisioned.
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.825]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-2]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] - Metrics collection has
>>>>>>> started successfully
>>>>>>> [error] Aug 20, 2016 12:45:17 PM kamon.sigar.SigarProvisioner
>>>>>>> provision
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.825] [main]
>>>>>>> [akka.remote.Remoting] Remoting started; listening on addresses
>>>>>>> :[akka.tcp://ClusterSystem@127.0.0.1:2552]
>>>>>>> [error] WARNING: Sigar library is already provisioned.
>>>>>>> [error] Aug 20, 2016 12:45:17 PM kamon.sigar.SigarProvisioner
>>>>>>> provision
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.825] [main]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2552] - Starting up...
>>>>>>> [error] WARNING: Sigar library is already provisioned.
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.841] [main]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2552] - Started up successfully
>>>>>>> [error] Aug 20, 2016 12:45:17 PM kamon.sigar.SigarProvisioner
>>>>>>> provision
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.841]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-4]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2552] - Metrics collection has
>>>>>>> started successfully
>>>>>>> [error] WARNING: Sigar library is already provisioned.
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.856] [main]
>>>>>>> [akka.remote.Remoting] Starting remoting
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.856] [main]
>>>>>>> [akka.remote.Remoting] Remoting started; listening on addresses
>>>>>>> :[akka.tcp://ClusterSystem@127.0.0.1:50317]
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.856] [main]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:50317] - Starting up...
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.856] [main]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:50317] - Started up successfully
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.872]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-4]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:50317] - Metrics collection has
>>>>>>> started successfully
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.888] [main]
>>>>>>> [akka.remote.Remoting] Starting remoting
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.903] [main]
>>>>>>> [akka.remote.Remoting] Remoting started; listening on addresses
>>>>>>> :[akka.tcp://ClusterSystem@127.0.0.1:50332]
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.903] [main]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:50332] - Starting up...
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.903] [main]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:50332] - Started up successfully
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.903] [main]
>>>>>>> [akka.actor.ActorSystemImpl(ClusterSystem)] Factorials will start
>>>>>>> when 2 backend members in the cluster.
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.903]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-6]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:50332] - Metrics collection has
>>>>>>> started successfully
>>>>>>> [info] [INFO] [08/20/2016 12:45:17.950]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-16]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] - Node [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2551] is JOINING, roles [backend]
>>>>>>> [info] [INFO] [08/20/2016 12:45:20.856]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-14] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2551/user/metricsListener] Used heap:
>>>>>>> 24.170730590820312 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:20.872]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-17] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2552/user/metricsListener] Used heap:
>>>>>>> 24.502845764160156 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:20.888]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-22] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:50317/user/metricsListener] Used heap:
>>>>>>> 24.502845764160156 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:22.998]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-18]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] - Node [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:50317] is JOINING, roles [backend]
>>>>>>> [info] [INFO] [08/20/2016 12:45:22.998]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-18]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] - Node [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:50332] is JOINING, roles [frontend]
>>>>>>> [info] [INFO] [08/20/2016 12:45:22.998]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-18]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] - Node [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2552] is JOINING, roles [backend]
>>>>>>> [info] [INFO] [08/20/2016 12:45:23.092]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-16]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:50332] - Welcome from
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551]
>>>>>>> [info] [INFO] [08/20/2016 12:45:23.092]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-23]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:50317] - Welcome from
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551]
>>>>>>> [info] [INFO] [08/20/2016 12:45:23.092]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-17]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2552] - Welcome from
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551]
>>>>>>> [info] [INFO] [08/20/2016 12:45:23.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-2]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] - Leader is moving node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] to [Up]
>>>>>>> [info] [INFO] [08/20/2016 12:45:23.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-2]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] - Leader is moving node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2552] to [Up]
>>>>>>> [info] [INFO] [08/20/2016 12:45:23.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-2]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] - Leader is moving node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:50317] to [Up]
>>>>>>> [info] [INFO] [08/20/2016 12:45:23.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-2]
>>>>>>> [akka.cluster.Cluster(akka://ClusterSystem)] Cluster Node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:2551] - Leader is moving node
>>>>>>> [akka.tcp://ClusterSystem@127.0.0.1:50332] to [Up]
>>>>>>> [info] [INFO] [08/20/2016 12:45:23.842]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-18] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2551/user/metricsListener] Used heap:
>>>>>>> 25.406883239746094 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:23.842]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-2] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2552/user/metricsListener] Used heap:
>>>>>>> 25.679889678955078 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:23.889]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-5] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:50317/user/metricsListener] Used heap:
>>>>>>> 26.044485092163086 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:24.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-6]
>>>>>>> [akka://ClusterSystem/deadLetters] Message [java.lang.Integer] from
>>>>>>> Actor[akka://ClusterSystem/user/factorialFrontend#289680043] to
>>>>>>> Actor[akka://ClusterSystem/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] [INFO] [08/20/2016 12:45:24.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-6]
>>>>>>> [akka://ClusterSystem/deadLetters] Message [java.lang.Integer] from
>>>>>>> Actor[akka://ClusterSystem/user/factorialFrontend#289680043] to
>>>>>>> Actor[akka://ClusterSystem/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] [INFO] [08/20/2016 12:45:24.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-6]
>>>>>>> [akka://ClusterSystem/deadLetters] Message [java.lang.Integer] from
>>>>>>> Actor[akka://ClusterSystem/user/factorialFrontend#289680043] to
>>>>>>> Actor[akka://ClusterSystem/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] [INFO] [08/20/2016 12:45:24.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-6]
>>>>>>> [akka://ClusterSystem/deadLetters] Message [java.lang.Integer] from
>>>>>>> Actor[akka://ClusterSystem/user/factorialFrontend#289680043] to
>>>>>>> Actor[akka://ClusterSystem/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] [INFO] [08/20/2016 12:45:24.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-6]
>>>>>>> [akka://ClusterSystem/deadLetters] Message [java.lang.Integer] from
>>>>>>> Actor[akka://ClusterSystem/user/factorialFrontend#289680043] to
>>>>>>> Actor[akka://ClusterSystem/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] [INFO] [08/20/2016 12:45:24.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-6]
>>>>>>> [akka://ClusterSystem/deadLetters] Message [java.lang.Integer] from
>>>>>>> Actor[akka://ClusterSystem/user/factorialFrontend#289680043] to
>>>>>>> Actor[akka://ClusterSystem/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] [INFO] [08/20/2016 12:45:24.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-6]
>>>>>>> [akka://ClusterSystem/deadLetters] Message [java.lang.Integer] from
>>>>>>> Actor[akka://ClusterSystem/user/factorialFrontend#289680043] to
>>>>>>> Actor[akka://ClusterSystem/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] [INFO] [08/20/2016 12:45:24.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-6]
>>>>>>> [akka://ClusterSystem/deadLetters] Message [java.lang.Integer] from
>>>>>>> Actor[akka://ClusterSystem/user/factorialFrontend#289680043] to
>>>>>>> Actor[akka://ClusterSystem/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] [INFO] [08/20/2016 12:45:24.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-6]
>>>>>>> [akka://ClusterSystem/deadLetters] Message [java.lang.Integer] from
>>>>>>> Actor[akka://ClusterSystem/user/factorialFrontend#289680043] to
>>>>>>> Actor[akka://ClusterSystem/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] [INFO] [08/20/2016 12:45:24.827]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-6]
>>>>>>> [akka://ClusterSystem/deadLetters] Message [java.lang.Integer] from
>>>>>>> Actor[akka://ClusterSystem/user/factorialFrontend#289680043] to
>>>>>>> Actor[akka://ClusterSystem/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] [INFO] [08/20/2016 12:45:26.845]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-16] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2551/user/metricsListener] Used heap:
>>>>>>> 27.490310668945312 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:26.861]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-20] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2552/user/metricsListener] Used heap:
>>>>>>> 27.72617530822754 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:26.892]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-25] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:50317/user/metricsListener] Used heap:
>>>>>>> 28.058615684509277 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:29.845]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-3] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2551/user/metricsListener] Used heap:
>>>>>>> 29.725139617919922 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:29.861]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-16] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2552/user/metricsListener] Used heap:
>>>>>>> 31.370417594909668 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:29.877]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-6] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:50317/user/metricsListener] Used heap:
>>>>>>> 31.119688034057617 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:32.845]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-2] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2551/user/metricsListener] Used heap:
>>>>>>> 34.224236488342285 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:32.861]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-19] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2552/user/metricsListener] Used heap:
>>>>>>> 35.63067626953125 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:32.892]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-19] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:50317/user/metricsListener] Used heap:
>>>>>>> 34.61888408660889 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:34.861]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-3] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:50332/user/factorialFrontend] Timeout
>>>>>>> [info] [WARN] [08/20/2016 12:45:34.892]
>>>>>>> [ClusterSystem-akka.remote.default-remote-dispatcher-6]
>>>>>>> [akka.serialization.Serialization(akka://ClusterSystem)] Using the
>>>>>>> default Java serializer for class [scala.Tuple2] which is not 
>>>>>>> recommended
>>>>>>> because of performance implications. Use another serializer or disable 
>>>>>>> this
>>>>>>> warning using the setting 'akka.actor.warn-about-java-se
>>>>>>> rializer-usage'
>>>>>>> [info] [WARN] [08/20/2016 12:45:34.892]
>>>>>>> [ClusterSystem-akka.remote.default-remote-dispatcher-7]
>>>>>>> [akka.serialization.Serialization(akka://ClusterSystem)] Using the
>>>>>>> default Java serializer for class [scala.Tuple2] which is not 
>>>>>>> recommended
>>>>>>> because of performance implications. Use another serializer or disable 
>>>>>>> this
>>>>>>> warning using the setting 'akka.actor.warn-about-java-se
>>>>>>> rializer-usage'
>>>>>>> [info] [WARN] [08/20/2016 12:45:34.892]
>>>>>>> [ClusterSystem-akka.remote.default-remote-dispatcher-6]
>>>>>>> [akka.serialization.Serialization(akka://ClusterSystem)] Using the
>>>>>>> default Java serializer for class [scala.Tuple2] which is not 
>>>>>>> recommended
>>>>>>> because of performance implications. Use another serializer or disable 
>>>>>>> this
>>>>>>> warning using the setting 'akka.actor.warn-about-java-se
>>>>>>> rializer-usage'
>>>>>>> [info] [INFO] [08/20/2016 12:45:35.845]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-2] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2551/user/metricsListener] Used heap:
>>>>>>> 51.5294075012207 MB
>>>>>>> [info] [INFO] [08/20/2016 12:45:35.861]
>>>>>>> [ClusterSystem-akka.actor.default-dispatcher-39] [akka.tcp://
>>>>>>> ClusterSystem@127.0.0.1:2552/user/metricsListener] Used heap:
>>>>>>> 57.282443046569824 MB
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>> --
>> >>>>>>>>>> Read the docs: http://akka.io/docs/
>> >>>>>>>>>> Check the FAQ: http://doc.akka.io/docs/akka/c
>> urrent/additional/faq.html
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>
> --
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-- 
>>>>>>>>>>      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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