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

[Bela Ban (Jira)]

     [ https://issues.jboss.org/browse/JGRP-2375?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bela Ban resolved JGRP-2375.
----------------------------
    Resolution: Done


> 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
>            Priority: Major
>             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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