On Thu, Apr 24, 2014 at 9:37 AM, Lawrence Wagerfield < lawre...@dmz.wagerfield.com> wrote:
> Hi Patrik, > > Thanks for the info. I saw the Google Compute Engine post only last week - > possibly when I was searching for this answer! > > You mentioned the gossip interval and how the time would grow > logarithmically - are these the main two things to consider? > > Is there at least a *very rough* algorithm I can use to estimate this > time, highlighting the most significant variables? > Here is something you can play with: http://www.serfdom.io/docs/internals/simulator.html but it might not match what you will see in a real Akka cluster. /Patrik > > Greatly appreciate the feedback, > Lawrence > > On Wednesday, April 23, 2014 9:21:53 PM UTC+1, Patrik Nordwall wrote: >> >> >> >> >> On Wed, Apr 23, 2014 at 9:15 PM, Lawrence Wagerfield < >> lawr...@dmz.wagerfield.com> wrote: >> >>> How can I determine the maximum length of time cluster membership state >>> will be inconsistent for across an Akka Cluster, assuming no further >>> membership changes beyond the point we start measuring? >>> >> We have performed tests of this in a cluster with many nodes. The results >> are presented in these blog posts: >> http://typesafe.com/blog/running-a-2400-akka-nodes- >> cluster-on-google-compute-engine >> http://typesafe.com/blog/starting-up-a-1000-node-akka- >> cluster-in-4-minutes-on-google-compute-engine >> >>> I imagine this will depend on several variables: some configurable >>> within Akka, and some that are infrastructural. >>> >> Yes, that is right. For example the gossip interval. >> >>> Given these variables, is there a way of calculating the worse-case in >>> seconds? >>> >> The theoretical expected dissemination time would grow logarithmic with >> the size of the cluster, but we have implemented several optimizations >> compared to pure random gossip. You have to test and measure. >> >> Regards, >> Patrik >> >>> -- >>> >>>>>>>>>> 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 akka-user+...@googlegroups.com. >>> To post to this group, send email to akka...@googlegroups.com. >>> >>> Visit this group at http://groups.google.com/group/akka-user. >>> For more options, visit https://groups.google.com/d/optout. >>> >> >> >> >> -- >> >> Patrik Nordwall >> Typesafe <http://typesafe.com/> - Reactive apps on the JVM >> Twitter: @patriknw >> JOIN US. REGISTER TODAY! <http://www.scaladays.org/> >> Scala <http://www.scaladays.org/> >> Days <http://www.scaladays.org/> >> June 16th-18th, <http://www.scaladays.org/> >> Berlin <http://www.scaladays.org/> >> >> -- > >>>>>>>>>> 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 akka-user+unsubscr...@googlegroups.com. > To post to this group, send email to akka-user@googlegroups.com. > Visit this group at http://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. > -- Patrik Nordwall Typesafe <http://typesafe.com/> - Reactive apps on the JVM Twitter: @patriknw JOIN US. REGISTER TODAY! <http://www.scaladays.org/> Scala <http://www.scaladays.org/> Days <http://www.scaladays.org/> June 16th-18th, <http://www.scaladays.org/> Berlin <http://www.scaladays.org/> -- >>>>>>>>>> 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 akka-user+unsubscr...@googlegroups.com. To post to this group, send email to akka-user@googlegroups.com. Visit this group at http://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/d/optout.
