Wow. Thanks for the quick response!! I didn’t see the `forServers()` before. That is great.
And I like the idea of sharing the state directly in a “flags” cache. Great idea. In my case, I also want to continually monitor the “expected number of Servers”, so that I can send Alerts as Nodes inevitably come and go in AWS. But I can use this same idea and provide another Listener that sends an Alert (or logs an ERROR, etc.) Good stuff! Thank you again, — Chris > On Jul 10, 2017, at 2:55 AM, dkarachentsev [via Apache Ignite Users] > <ml+s70518n14550...@n6.nabble.com> wrote: > > Hi Chris, > > You understand correctly that you need to subscribe for node joined event. > Here is possible example of how to write it: > > private static class Listener implements IgnitePredicate<Event> { > > @IgniteInstanceResource > private Ignite ignite; > > @Override public boolean apply(Event evt) { > int size = ignite.cluster().forServers().nodes().size(); // check > cluster size for servers only > > if (size == 10) { > // Generate ready event only once > if (ignite.cache("flags").putIfAbsent("gridReady", true)) > System.out.println("Got expected size"); > > // Unsubscribe > return false; > } > > return true; > } > } > > And configuration: > > Map<IgnitePredicate<? extends Event>, int[]> listeners = new > HashMap<>(); > > listeners.put(new Listener(), new int[]{EventType.EVT_NODE_JOINED}); > > cfg.setLocalEventListeners(listeners); > > cfg.setCacheConfiguration(new CacheConfiguration("flags")); > > Thanks! > -Dmitry > > If you reply to this email, your message will be added to the discussion > below: > http://apache-ignite-users.70518.x6.nabble.com/Determine-current-number-of-Server-Nodes-tp14542p14550.html > > <http://apache-ignite-users.70518.x6.nabble.com/Determine-current-number-of-Server-Nodes-tp14542p14550.html> > To unsubscribe from Determine current number of Server Nodes, click here > <http://apache-ignite-users.70518.x6.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=14542&code=Y2hyaXN3YmVycnlAZ21haWwuY29tfDE0NTQyfC0xMzY1MjUwNjAz>. > NAML > <http://apache-ignite-users.70518.x6.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> -- View this message in context: http://apache-ignite-users.70518.x6.nabble.com/Determine-current-number-of-Server-Nodes-tp14542p14552.html Sent from the Apache Ignite Users mailing list archive at Nabble.com.