[jboss-jira] [JBoss JIRA] (JGRP-2375) Discovery: concurrent discovery doesn't work

[Bela Ban (Jira)]

Bela Ban created JGRP-2375:
------------------------------

             Summary: Discovery: concurrent discovery doesn't work
                 Key: JGRP-2375
                 URL: https://issues.jboss.org/browse/JGRP-2375
             Project: JGroups
          Issue Type: Bug
            Reporter: Bela Ban
            Assignee: Bela Ban
             Fix For: 4.1.5


If {{num_discovery_runs}} is greater than 1, then sometimes startup of a member blocks. 

The stack trace below indicates this is an issue with comparison of {{Task}} ({{Future}}) elements in the ConcurrentSkipListSet.

Solution: replace the set with an ArrayList: there is no need to sort the futures, or avoid duplicates, as the list is only added to or cleared.

{noformat}
"main" #1 prio=5 os_prio=31 tid=0x00007ff886001800 nid=0x1c03 runnable [0x000070000f96f000]
   java.lang.Thread.State: RUNNABLE
	at java.util.concurrent.ConcurrentSkipListMap.findPredecessor(ConcurrentSkipListMap.java:684)
	at java.util.concurrent.ConcurrentSkipListMap.doPut(ConcurrentSkipListMap.java:823)
	at java.util.concurrent.ConcurrentSkipListMap.putIfAbsent(ConcurrentSkipListMap.java:1979)
	at java.util.concurrent.ConcurrentSkipListSet.add(ConcurrentSkipListSet.java:241)
	at org.jgroups.protocols.Discovery.findMembers(Discovery.java:235)
	at org.jgroups.protocols.Discovery.down(Discovery.java:380)
	at org.jgroups.protocols.MERGE3.down(MERGE3.java:278)
	at org.jgroups.protocols.FD_SOCK.down(FD_SOCK.java:377)
	at org.jgroups.protocols.FD_ALL.down(FD_ALL.java:235)
	at org.jgroups.protocols.VERIFY_SUSPECT.down(VERIFY_SUSPECT.java:102)
	at org.jgroups.protocols.BARRIER.down(BARRIER.java:136)
	at org.jgroups.protocols.pbcast.NAKACK2.down(NAKACK2.java:553)
	at org.jgroups.protocols.UNICAST3.down(UNICAST3.java:581)
	at org.jgroups.protocols.pbcast.STABLE.down(STABLE.java:347)
	at org.jgroups.protocols.pbcast.ClientGmsImpl.joinInternal(ClientGmsImpl.java:72)
	at org.jgroups.protocols.pbcast.ClientGmsImpl.join(ClientGmsImpl.java:40)
	at org.jgroups.protocols.pbcast.GMS.down(GMS.java:1044)
	at org.jgroups.protocols.FlowControl.down(FlowControl.java:295)
	at org.jgroups.protocols.FlowControl.down(FlowControl.java:295)
	at org.jgroups.protocols.FRAG2.down(FRAG2.java:141)
	at org.jgroups.stack.ProtocolStack.down(ProtocolStack.java:928)
	at org.jgroups.JChannel.down(JChannel.java:627)
	at org.jgroups.JChannel._connect(JChannel.java:855)
	at org.jgroups.JChannel.connect(JChannel.java:352)
	- locked <0x000000079e04cfa0> (a org.jgroups.JChannel)
	at org.jgroups.JChannel.connect(JChannel.java:343)
	- locked <0x000000079e04cfa0> (a org.jgroups.JChannel)
	at org.jgroups.tests.bla6.start(bla6.java:41)
	at org.jgroups.tests.bla6.main(bla6.java:54)
{noformat}



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