LoggerInitializationException - Akka logger timing out in Play application

Suraj Mundada

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May 13, 2016, 5:11:41 AM5/13/16

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Hi,

I am using Play 2.4.6 on CentOS 6 server with Java 8 for deploying production application. I am using Akka actors for doing my async tasks and sending email is one the tasks.

From last 2 days, I am getting following exception:

akka.ConfigurationException: Could not start logger due to [akka.ConfigurationException: Logger specified in config can't be loaded [akka.event.Logging$DefaultLogger] due to [akka.event.Logging$LoggerInitializationException: Logger log1-Logging$DefaultLogger did not respond with LoggerInitialized, sent instead [TIMEOUT]]] 
at akka.event.LoggingBus$class.startDefaultLoggers(Logging.scala:144) 
at akka.event.EventStream.startDefaultLoggers(EventStream.scala:26) 
at akka.actor.LocalActorRefProvider.init(ActorRefProvider.scala:623) 
at akka.actor.ActorSystemImpl.liftedTree2$1(ActorSystem.scala:620) 
at akka.actor.ActorSystemImpl._start$lzycompute(ActorSystem.scala:617) 
at akka.actor.ActorSystemImpl._start(ActorSystem.scala:617) 
at akka.actor.ActorSystemImpl.start(ActorSystem.scala:634) 
at akka.actor.ActorSystem$.apply(ActorSystem.scala:142) 
at akka.actor.ActorSystem$.apply(ActorSystem.scala:109) 
at akka.actor.ActorSystem$.create(ActorSystem.scala:57) 
at akka.actor.ActorSystem.create(ActorSystem.scala) 
at manager.EmailManager.sendHtmlEmail(EmailManager.java:63) at

My application.conf has below entry:

akka {
        loggers = ["akka.event.slf4j.Slf4jLogger"]
        loglevel = "DEBUG"
        logging-filter = "akka.event.slf4j.Slf4jLoggingFilter"
        event-handlers = ["akka.event.slf4j.Slf4jEventHandler"]
        default-dispatcher {
                fork-join-executor {
                        parallelism-min = 8
                                }
                }
}

logback.xml has following entries apart from other appender and logger declarations:

   <logger name="play" level="INFO" />
   <logger name="application" level="DEBUG" />
   <logger name="akka" level="INFO" />

However, I do not use akka logger reference defined above anywhere in my code. Instead, I use default logger configuration where timeout is happening:


 Logger.debug("EmailActor - onReceive() : MultiPartEmail message to x...@abc.com");

Each time timeout happens, I have to restart my play application.

Is it hardware issue which is restricting threads available for creating new actor instances? or something else?

My production box is 1 Core 4 GB with CentOS 6 and play application runs within a docker on this box.

Regards,

Suraj

Patrik Nordwall

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May 13, 2016, 2:57:42 PM5/13/16

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You can try to increase the timeout. You find the property in reference.conf of akka-actor.

/Patrik

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Suraj Mundada

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May 30, 2016, 7:18:03 AM5/30/16

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I am still getting the timeout exception and every time I have to restart my prod server to fix the issue.

I also tried following:

akka {

loggers = ["akka.event.slf4j.Slf4jLogger"]

loglevel = "DEBUG"

logging-filter = "akka.event.slf4j.Slf4jLoggingFilter"

event-handlers = ["akka.event.slf4j.Slf4jEventHandler"]

default-dispatcher {

fork-join-executor {

parallelism-factor = 1.0

parallelism-max = 24

task-peeking-mode = LIFO

}

But no success.

Any pointers?

Viktor Klang

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May 30, 2016, 7:19:29 AM5/30/16

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You didn't change the timeout value.

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Suraj Mundada

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May 30, 2016, 8:27:16 AM5/30/16

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I am using Akka in Play 2.4.6 application and could not find reference.conf in my play application.

Also, there is no reference available in Play or Akka docs how I can add it in Play application.

Can you please share this info?

Thanks,

Suraj

Akka Team

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May 30, 2016, 8:41:35 AM5/30/16

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The reference.conf contains default configuration for Akka, it is nothing you need to add or change, it is shipped together with the classes in the akka-actor artifact. Your IDE should let you look at the contents of dependencies, it will be in the root directory of the akka-actor jar-file.

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Patrik Nordwall

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May 30, 2016, 9:40:52 AM5/30/16

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Take a look here: https://www.playframework.com/documentation/2.4.x/JavaAkka#Configuration

Patrik Nordwall
Akka Tech Lead
Lightbend - Reactive apps on the JVM
Twitter: @patriknw

Suraj Mundada

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May 31, 2016, 1:13:41 PM5/31/16

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I looked at https://www.playframework.com/documentation/2.4.x/JavaAkka#Configuration

It talks about only 2 parameters

akka.actor.default-dispatcher.fork-join-executor.pool-size-max = 64
akka.actor.debug.receive = on

I looked up these parameters on http://doc.akka.io/docs/akka/snapshot/general/configuration.html but could not find the parameters.

My current config is

akka {
	loggers = ["akka.event.slf4j.Slf4jLogger"]
	loglevel = "DEBUG"
	logging-filter = "akka.event.slf4j.Slf4jLoggingFilter"
	event-handlers = ["akka.event.slf4j.Slf4jEventHandler"]
	default-dispatcher {
		fork-join-executor {
			parallelism-factor = 1.0
			parallelism-max = 24
			task-peeking-mode = LIFO
		}
	}
}

I have only one processor in my server. So, I guess parallelism-factor = 1.0 is blocking creation of enough threads for actors. I will try parallelism-factor = 3.0 and watch it for some time if that helps.

Please let me know if I should try something else.

Regards,

Suraj

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