[jboss-jira] [JBoss JIRA] Resolved: (JGRP-1368) RPC calls during view updates

RPC calls during view updates ----------------------------- Key: JGRP-1368 URL: https://issues.jboss.org/browse/JGRP-1368 Project: JGroups Issue Type: Bug Affects Versions: 3.0 Environment: Java version: 1.6.0_22 JGroups: 3.0.0.CR1 Reporter: Andrey Vorobiev Assignee: Bela Ban Fix For: 3.0 Environment consists of one server node and several client nodes. When new client node joins group I should call some remote method on it from server node. Client node source code: import org.jgroups.*; import org.jgroups.blocks.RpcDispatcher; public class Client extends ReceiverAdapter{ public void start() throws Exception{ JChannel channel = new JChannel(); RpcDispatcher dispatcher = new RpcDispatcher(channel, this, this, this); channel.connect("cluster"); } public String doIt(String arg){ System.out.println("Client called: " + arg); return arg; } public static void main(String[] args) throws Exception{ new Client().start(); } } Server node source code: import java.util.*; import org.jgroups.*; import org.jgroups.blocks.*; import org.jgroups.util.*; public class Server extends ReceiverAdapter{ JChannel channel; RpcDispatcher dispatcher; public void start() throws Exception{ channel = new JChannel(); dispatcher = new RpcDispatcher(channel, null, this, this); channel.connect("cluster"); } public void viewAccepted(View view){ try { System.out.println("view accepted: " + view); if (channel.isConnected()) { callClients(view); } } catch (Throwable e) { e.printStackTrace(); } } public void callClients(View view) throws Exception{ MethodCall call = new MethodCall("doIt", new Object[]{ "Hello world" }, new Class[]{String.class}); RspList<String> rsp = dispatcher.callRemoteMethods(filter(view.getMembers()), call, new RequestOptions(ResponseMode.GET_ALL, 10000)); for (Map.Entry<Address, Rsp<String>> pair : rsp.entrySet()) { System.out.println(pair.getKey() + " -- " + pair.getValue().getValue()); } } public Collection<Address> filter(Collection<Address> addresses){ Collection<Address> result = new ArrayList<Address>(); for (Address address : addresses) { if (!address.equals(dispatcher.getChannel().getAddress())) { result.add(address); } } return result; } public String doIt(String arg){ System.out.println("Server called: " + arg); return arg; } public static void main(String[] args) throws Exception{ new Server().start(); } } If client node is started before server one everything work as expected. But when server node is started before client one I observe following in stdout from server node: Sep 16, 2011 5:15:54 PM org.jgroups.logging.JDKLogImpl info INFO: JGroups version: 3.0.0.CR1 Sep 16, 2011 5:15:54 PM org.jgroups.logging.JDKLogImpl warn WARNING: receive buffer of socket java.net.DatagramSocket@7c6572b was set to 20MB, but the OS only allocated 65.51KB. This might lead to performance problems. Please set your max receive buffer in the OS correctly (e.g. net.core.rmem_max on Linux) Sep 16, 2011 5:15:54 PM org.jgroups.logging.JDKLogImpl warn WARNING: receive buffer of socket java.net.MulticastSocket@6e84cc09 was set to 25MB, but the OS only allocated 65.51KB. This might lead to performance problems. Please set your max receive buffer in the OS correctly (e.g. net.core.rmem_max on Linux) ------------------------------------------------------------------- GMS: address=andrey-8222, cluster=cluster, physical address=10.0.1.197:65216 ------------------------------------------------------------------- view [andrey-8222|0] [andrey-8222] connected true method called [] view [andrey-8222|1] [andrey-8222, andrey-63112] connected true Sep 16, 2011 5:16:17 PM org.jgroups.logging.JDKLogImpl warn WARNING: andrey-8222: failed to collect all ACKs (expected=1) for view [andrey-8222|1] [andrey-8222, andrey-63112] after 2000ms, missing ACKs from [andrey-8222] method called [] andrey-63112 -- null Server called: Hello world I'm confused by the following: - server nodes tries to receive ACKs from itself (missing ACKs from [andrey-8222]) - rpc dispatcher calls server node (Server called: Hello world) I can work around this issue by doing rpc call in separate thread. By in this case I sometimes receive null as call result from some nodes with following messages in client logs: no physical address for xxx. Also I have some general questions about RPC dispatcher: - are rpc calls supported during view update? - what conditions I should wait for in order to guarantee rpc dispatcher's correct behavior?