[jboss-jira] [JBoss JIRA] (JGRP-2305) Get rid of need for java.net.preferIPv4Stack

[Dan Berindei (Jira)]

    [ https://issues.jboss.org/browse/JGRP-2305?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13691879#comment-13691879 ] 

Dan Berindei commented on JGRP-2305:
------------------------------------

Not sure if I should reopen this issue, but I can only run tests that use MPING with the default settings (e.g. {{LeaveTest}}) if I set {{-Djava.net.preferIPv4Stack=true}}. Without it I get this error:

{noformat}
17:00:31,730 ERROR (main:[]) [MPING] JGRP000200: failed sending discovery request
java.io.IOException: Invalid argument (sendto failed)
	at java.net.PlainDatagramSocketImpl.send(Native Method) ~[?:1.8.0_171]
	at java.net.DatagramSocket.send(DatagramSocket.java:693) ~[?:1.8.0_171]
	at org.jgroups.protocols.MPING.sendMcastDiscoveryRequest(MPING.java:306) [classes/:?]
	at org.jgroups.protocols.PING.sendDiscoveryRequest(PING.java:64) [classes/:?]
	at org.jgroups.protocols.PING.findMembers(PING.java:32) [classes/:?]
	at org.jgroups.protocols.Discovery.invokeFindMembers(Discovery.java:214) [classes/:?]
	at org.jgroups.protocols.Discovery.findMembers(Discovery.java:239) [classes/:?]
	at org.jgroups.protocols.Discovery.down(Discovery.java:379) [classes/:?]
	at org.jgroups.protocols.FD_SOCK.down(FD_SOCK.java:376) [classes/:?]
	at org.jgroups.protocols.FD_ALL.down(FD_ALL.java:236) [classes/:?]
	at org.jgroups.protocols.VERIFY_SUSPECT.down(VERIFY_SUSPECT.java:101) [classes/:?]
	at org.jgroups.protocols.pbcast.NAKACK2.down(NAKACK2.java:563) [classes/:?]
	at org.jgroups.protocols.UNICAST3.down(UNICAST3.java:570) [classes/:?]
	at org.jgroups.protocols.pbcast.STABLE.down(STABLE.java:346) [classes/:?]
	at org.jgroups.protocols.pbcast.ClientGmsImpl.joinInternal(ClientGmsImpl.java:72) [classes/:?]
	at org.jgroups.protocols.pbcast.ClientGmsImpl.join(ClientGmsImpl.java:40) [classes/:?]
	at org.jgroups.protocols.pbcast.GMS.down(GMS.java:1076) [classes/:?]
	at org.jgroups.stack.ProtocolStack.down(ProtocolStack.java:908) [classes/:?]
	at org.jgroups.JChannel.down(JChannel.java:668) [classes/:?]
	at org.jgroups.JChannel._connect(JChannel.java:897) [classes/:?]
	at org.jgroups.JChannel.connect(JChannel.java:393) [classes/:?]
	at org.jgroups.JChannel.connect(JChannel.java:384) [classes/:?]
	at org.jgroups.tests.LeaveTest.setup(LeaveTest.java:48) [classes/:?]
	at org.jgroups.tests.LeaveTest.testConcurrentLeaves2(LeaveTest.java:152) [classes/:?]
{noformat}

> Get rid of need for java.net.preferIPv4Stack
> --------------------------------------------
>
>                 Key: JGRP-2305
>                 URL: https://issues.jboss.org/browse/JGRP-2305
>             Project: JGroups
>          Issue Type: Enhancement
>            Reporter: Bela Ban
>            Assignee: Bela Ban
>            Priority: Major
>             Fix For: 4.0.16
>
>
> New address picking scheme:
> * First we detect which addresses are available: IPv4 and/or IPv6 (dual-stack if both)
> * When we encounter an IPv4 address:
> ** If dual-stack or IPv4 stack: use it
> ** If IPv6-only stack: use it unless it is a class D (multicast) address: then convert it to an IPv6-mapped address
> * When we encounter an IPv6 address:
> ** If dual-stack or IPv6-only stack: use it
> ** Else: throw an exception (IPv6 address in an IPv4-only stack)



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