Hi Reid,
I opened an issue on github regarding
this: https://github.com/akka/akka/issues/17087
The problem as I can see it is in the no Terminated messages sent by
PromiseActorRef, thus these actor get watched forever and not collected by
gc.
On Monday, March 30, 2015 at 12:53:35 AM UTC+3, Reid Spencer wrote:
>
> Yaroslav,
>
> The ask pattern doesn't execute synchronously but returns a Future[Any]
> immediately, which your program is ignoring. The future captures the
> response from the actor at some future time (when the message send/reply is
> complete). However, in your main program, that infinite loop is going to
> many of those Future[Any] responses very quickly which will eventually
> exhaust memory or overflow the message buffer. All those created future
> objects aren't leaks per se as much as they are being created so fast that
> the garbage collector has trouble keeping up with it.
>
> If you wanted to make those calls synchronous, you should use the
> Await.result idiom by changing the loop to:
>
> while (true) {
> val future = actor ? "Request"
> val result = Await.result(future, timeout.duration)
> assert(result == "Response")
> }
>
>
> Hope that helps.
>
> Reid.
>
> On Sunday, March 29, 2015 at 5:04:50 AM UTC-4, Yaroslav Klymko wrote:
>>
>> The minimal app to reproduce this:
>>
>> import akka.actor.{Actor, ActorSystem, Props}
>> import akka.pattern.ask
>> import akka.util.Timeout
>> import scala.concurrent.duration._
>>
>> object MemoryLeakApp extends App {
>> val system = ActorSystem()
>> val actor = system.actorOf(Props[MyActor])
>> implicit val timeout = Timeout(3.seconds)
>> while (true) {
>> actor ? "Request"
>> }
>> }
>>
>> class MyActor extends Actor {
>> def receive = {
>> case _ =>
>> val actor = sender()
>> context.watch(actor)
>> actor ! "Response"
>> }
>> }
>>
>>
>> On Sunday, March 29, 2015 at 12:03:43 PM UTC+3, Yaroslav Klymko wrote:
>>>
>>> Hi guys,
>>> Root cause of my issue has been found, in short it is caused by *context
>>> watch sender()*, where the sender is PrmiseActorRef.
>>>
>>>
>>> On Sunday, March 29, 2015 at 10:33:47 AM UTC+3, Yaroslav Klymko wrote:
>>>>
>>>> So PrmiseActorRef is leaking and keeps reference on Promise &
>>>> WriteEventsCompleted, still I'm not able to find a combination of
>>>> dispatchers/actors to reproduce on simple example.
>>>>
>>>> On Saturday, March 28, 2015 at 9:33:15 PM UTC+2, Yaroslav Klymko wrote:
>>>>>
>>>>> Hi guys,
>>>>> I have a very strange problem, it was originally spotted by
>>>>> @gfduszynski
>>>>> https://github.com/EventStore/EventStore.Akka.Persistence/issues/11
>>>>>
>>>>> Here is a problematic line of code
>>>>>
>>>>> https://github.com/EventStore/EventStore.Akka.Persistence/blob/v2.0.0/src/main/scala/akka/persistence/eventstore/journal/EventStoreJournal.scala#L28
>>>>>
>>>>> Basically it is a *actor ? WriteEvents* which returns
>>>>> *Future[WriteEventsCompleted]*, these *WriteEventsCompleted* messages
>>>>> are leaking, however *actor ! WriteEvents *is not leaking...
>>>>> Also I couldn't reproduce this using simple app without akka
>>>>> persistence.
>>>>>
>>>>> I will really appreciate any help, any ideas.
>>>>> Thanks!
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> <https://lh3.googleusercontent.com/-GswiQ2lLtTU/VRcAmBy7mDI/AAAAAAAAMHE/0fjbSplbpK4/s1600/Screenshot%2Bat%2BMar%2B28%2B21-26-50.png>
>>>>>
>>>>>
>>>>>
>>>>> <https://lh3.googleusercontent.com/-iBvp3mltxVs/VRcArTBLSpI/AAAAAAAAMHM/1E9raW_PKnI/s1600/Screenshot%2Bat%2BMar%2B28%2B21-26-35.png>
>>>>>
>>>>>
>>>>>
>>>>>
--
>>>>>>>>>> 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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