>Have you monitored the heap usage? You might have a memory leak.
Yes. I have a node state listener that monitors CPU and Heap, and it's
doesn't indicate any problem with heap until the node becomes unreachable.
Then after 15-20 minutes after node becomes unreachable, the heap and cpu
use is increased, but I believe this is because of many exceptions fired. I
also setup Tomcat to create a heap dump and log garbage collector
activities. Nothing indicates there is OutOfMemory problem.
Is there anything else that could cause this unreachable node problem? I
though it could only be a network problem if node is still running. When
this happens, the application is still running on the slave node and I can
access it through the REST services it has.
Are you using auto-down?
In 2.3.0-RC2 you can configure auto-down-unreachable-after to a longer
period, or not configure it at all (default off) and use some
external/manual downing strategy.
Yes. I'm using it, but I'm not sure what could I get with it. I would like
to prevent jobs to be interrupted if possible or at least to make it not
happening that often. Here is my configuration:
> akka {
> actor {
> provider = "akka.cluster.ClusterActorRefProvider"
> }
> remote {
> log-remote-lifecycle-events = off
> netty.tcp {
> hostname = "xxx.xxx.xxx.66"
> port = 2552
> }
> }
> cluster {
> seed-nodes = [
> "akka.tcp://[email protected]:2551"
> ]
>
> min-nr-of-members = 2
> auto-down= on
> log-dead-letters = 10
> log-dead-letters-during-shutdown = on
> allowLocalRoutees=true
> userRole=null
>
> }
> }
On Monday, 3 February 2014 11:46:03 UTC-8, Zoran Jeremic wrote:
>
> Hi,
>
> I'm implementing Web sites crawler using Akka clustering. I have one node
> that plays the role of master node where cluster is initialized from the
> ClusterControllerActor in the following way:
>
> int totalInstances = 2;
>> int maxInstancesPerNode = 1;
>> boolean allowLocalRoutees = true;
>> String useRole = null;
>> AdaptiveLoadBalancingPool pool = new AdaptiveLoadBalancingPool(
>> MixMetricsSelector.getInstance(), 0);
>> ClusterRouterPoolSettings settings = new
>> ClusterRouterPoolSettings(
>> totalInstances, maxInstancesPerNode, allowLocalRoutees,
>> useRole);
>> crawlerManager = getContext().actorOf(
>> new ClusterRouterPool(pool, settings).props(Props.create(
>> CrawlerManagerActor.class, getSelf())),
>> "crawlerManager");
>
>
>
> Other nodes play the role of slaves, and each node in cluster has one
> CrawlerManagerActor created from master node in AdaptiveLoadBalancingPool.
> For each crawling job (Web site to be crawled) I create one job that is
> delegated to the one of the CrawlingManagers based on MixMetricsSelector,
> and one job is running only on one node. CrawlerManager creates a set of
> actors that works together on dedicated task. After the job was finished,
> these actors are stopped and killed. This works pretty fine, until the
> moment when slave node is disconnected from cluster. I don't know why the
> slave node is disconnected after 24-48 hours of successful work (I'm
> hosting it on 2 Microsoft Azure instances with Tomcat), but once this
> happen I have a plenty of errors, e.g.:
>
> akka.pattern.AskTimeoutException:
>> Recipient[Actor[akka://ClusterSystem/remote/akka.tcp/[email protected]:2551/user/clusterController/crawlerManager/c2/$c/statisticsService#-1293629832]]
>>
>> had already been terminated.
>
>
> statisticService that is referred here is actually running on the slave
> node and is referred from slave node on the address xxx.xxx.xxx.66:2552,
> but it's referred through the clusterController which is initialized on
> master node, so StatisticServiceActor running on node xxx.xxx.xxx.66:2552
> has the path:
>
>
>> akka://ClusterSystem/remote/akka.tcp/[email protected]:2551/user/clusterController/crawlerManager/c2/$a/statisticsService
>
>
> I would like to make these actors (CrawlerManager and all other nodes
> created for each individual job and running on one node instance) to be
> able to continue running and finishing job even if node is disconnected
> from cluster, so this is not what I'm expecting and what I want. I'm not
> sure if this is expected behaviour or I missed to do something, but I hope
> somebody will have an idea how I could resolve this.
>
> Thanks,
> Zoran
>
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