That sounds perfect! graceful handoff of Cluster Sharding is most important for my project.
As I understand the ClusterSingleton is always using the leader as the host of the actor. Is there a way to elect/appoint a new leader if the leader is the one going down? Best regards, Anders On 7 May 2015 at 14:14, Patrik Nordwall <[email protected]> wrote: > For cluster sharding I have implemented that, but need to get in some other > things before I can submit that pull request. > https://github.com/akka/akka/issues/16050 > Perhaps next week (no promises). > > /Patrik > > On Thu, May 7, 2015 at 10:55 AM, Anders Båtstrand <[email protected]> > wrote: >> >> I am struggling with the same issue. >> >> I am using Cluster Sharding and Cluster Singleton. If I have to >> programmatically move the actors away from the node that is leaving the >> cluster, how can I do it? >> >> If I kill the actor, it would take time to get up, and it might even get >> up on the same node. >> >> I can see from my logs that when a node calls cluster.leave, the other >> node is sending HandOverToMe-messages (1). However, I don't know how to wait >> for the process to finish. cluster.leave does not wait (afaik), and shuts >> down the cluster-system before the migration is complete. >> >> Is this process documented somewhere? Can I send "HandOverToMe" myself? >> >> I don't mind the GUI hanging a few seconds if a node goes down unexpected, >> but I am trying to avoid it during upgrades, maintenance etc. >> >> Best regards, >> >> Anders >> >> 1) From my log: Retry[X], sending HandOverToMe to [None] >> >> >> onsdag 23. oktober 2013 17.39.38 UTC+2 skrev Akka Team følgende: >>> >>> Hi Fedor, >>> >>> Akka has currently no specific support for handling the handoff—which is >>> an application-specific concern anyway. In your case the node should do >>> whatever is necessary to hand off its data and only then initiate the >>> LEAVING state to finally exit. >>> >>> Regards, >>> >>> Roland >>> >>> On Wednesday, October 23, 2013, Fedor Tokarev wrote: >>>> >>>> Hi Viktor, >>>> >>>> Yeah, when a node is died unexpectedly, data migration is not possible. >>>> But what if a node is about to be gracefully stopped? What are the ways to >>>> perform a data migration in this case? >>>> >>>> A possible scenario: we have a cluster of N nodes. We shut down one node >>>> at a time, update its software, then bring it back to the cluster. Data >>>> should be migrated from a node before the maintenance, and then should be >>>> returned to the node after the maintenance. >>>> >>>> среда, 23 октября 2013 г., 18:41:44 UTC+4 пользователь √ написал: >>>>> >>>>> If you get Exited it's already too late. >>>>> >>>>> Compare this to a nomber of people out in the forest, communicating >>>>> over walkie-talkies. >>>>> If someone goes silent, after a while the others must assume he/she is >>>>> dead and move on, >>>>> at that point it's too late for that lost individual to start migrating >>>>> data (who would he migrate data to?) >>>>> >>>>> cheers, >>>>> √ >>>>> >>>>> >>>>> On Wed, Oct 23, 2013 at 4:29 PM, Fedor Tokarev <[email protected]> >>>>> wrote: >>>>>> >>>>>> Hi guys, >>>>>> >>>>>> What is the right way to migrate data from a leaving node? The docs >>>>>> say that ClusterEvent.MemberExited may be received when a node is already >>>>>> down. Does it mean that a leaving node must initiate data migration >>>>>> itself? >>>>>> How a node can detect that it is about to leave? How to make sure that >>>>>> the >>>>>> leader won't shutdown a leaving node in the middle of the data migration >>>>>> process? >>>>>> >>>>>> -- >>>>>> >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>> >>>>>>>>>> Check the FAQ: http://akka.io/faq/ >>>>>> >>>>>>>>>> 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. >>>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>>> an email to [email protected]. >>>>>> To post to this group, send email to [email protected]. >>>>>> Visit this group at http://groups.google.com/group/akka-user. >>>>>> For more options, visit https://groups.google.com/groups/opt_out. >>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> Cheers, >>>>> √ >>>>> >>>>> Viktor Klang >>>>> Director of Engineering >>>>> Typesafe >>>>> >>>>> Twitter: @viktorklang >>>> >>>> -- >>>> >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>> >>>>>>>>>> Check the FAQ: http://akka.io/faq/ >>>> >>>>>>>>>> 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. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> To post to this group, send email to [email protected]. >>>> Visit this group at http://groups.google.com/group/akka-user. >>>> For more options, visit https://groups.google.com/groups/opt_out. >>> >>> >>> >>> -- >>> Akka Team >>> Typesafe - The software stack for applications that scale >>> Blog: letitcrash.com >>> Twitter: @akkateam >>> >> -- >> >>>>>>>>>> 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. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To post to this group, send email to [email protected]. >> Visit this group at http://groups.google.com/group/akka-user. >> For more options, visit https://groups.google.com/d/optout. > > > > > -- > > Patrik Nordwall > Typesafe - Reactive apps on the JVM > Twitter: @patriknw > > -- >>>>>>>>>>> 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 a topic in the > Google Groups "Akka User List" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/akka-user/pCZDusmt2_Q/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. -- >>>>>>>>>> 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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