[jboss-jira] [JBoss JIRA] Resolved: (JGRP-611) MergeTask GMS ConcurrentModificationException

[Bela Ban (JIRA)]

     [ http://jira.jboss.com/jira/browse/JGRP-611?page=all ]

Bela Ban resolved JGRP-611.
---------------------------

    Resolution: Done

fixed in 2.6 (CVS head) and 2.5 branch

> MergeTask GMS ConcurrentModificationException
> ---------------------------------------------
>
>                 Key: JGRP-611
>                 URL: http://jira.jboss.com/jira/browse/JGRP-611
>             Project: JGroups
>          Issue Type: Bug
>            Reporter: Bela Ban
>         Assigned To: Bela Ban
>             Fix For: 2.5.2, 2.6
>
>
> [Vivek Sar]
> I'm using JGroups 2.5 GA and have 3 members in the group using udp
> gossip router (stack below). Occasionally, we have seen the following
> exception if a node goes down and comes up again. This happens over
> and over, only way to recover would then be to stop all the members
> and start them again.
>  2007-10-25 12:08:32,717 ERROR [MergeTask] GMS - exception while merging
> java.util.ConcurrentModificationException
> 	at java.util.AbstractList$Itr.checkForComodification(Unknown Source)
> 	at java.util.AbstractList$Itr.next(Unknown Source)
> 	at org.jgroups.protocols.pbcast.CoordGmsImpl.removeRejectedMergeRequests(CoordGmsImpl.java:749)
> 	at org.jgroups.protocols.pbcast.CoordGmsImpl.access$500(CoordGmsImpl.java:26)
> 	at org.jgroups.protocols.pbcast.CoordGmsImpl$MergeTask.run(CoordGmsImpl.java:817)
> 	at java.lang.Thread.run(Unknown Source)
> 2007-10-25 12:08:32,717 ERROR [MergeTask] GMS - coords or merge_id == null
> 2007-10-25 12:08:51,443 ERROR [MergeTask] GMS - coords or merge_id == null
> 2007-10-25 12:08:51,443 ERROR [MergeTask] GMS - coords or merge_id == null
> 2007-10-25 13:09:27,237 ERROR [MergeTask] GMS - coords or merge_id == null
> 2007-10-25 13:09:39,934 ERROR [MergeTask] GMS - coords or merge_id == null
> 2007-10-25 13:09:39,934 ERROR [MergeTask] GMS - coords or merge_id == null
> 2007-10-25 13:09:55,013 ERROR [MergeTask] GMS - coords or merge_id == null
> 2007-10-25 13:09:55,013 ERROR [MergeTask] GMS - coords or merge_id == null
> ...
> ...
> Protocol Stack,
> <config>
>     <UDP
> 		 ip_mcast="false"
> 		 mcast_addr="228.10.10.10"
> 		 mcast_port="3092"
> 		 bind_addr="${jgroups.bindaddress.ip:jgroupshost}"
> 		 bind_port="${jgroups.bindaddress.port:3092}"		 		
>          tos="16"
>          ucast_recv_buf_size="200000"
>          ucast_send_buf_size="640000"
>          mcast_recv_buf_size="250000"
>          mcast_send_buf_size="640000"
>          loopback="true"
>          discard_incompatible_packets="true"
>          max_bundle_size="64000"
>          max_bundle_timeout="30"
>          use_incoming_packet_handler="true"
>          use_outgoing_packet_handler="false"
>          ip_ttl="32"
>          enable_bundling="true"
> 		 use_concurrent_stack="true"
> 		 thread_pool.enabled="true"
> 		 thread_pool.min_threads="1"
> 		 thread_pool.max_threads="100"
> 		 thread_pool.keep_alive_time="20000"
> 		 thread_pool.queue_enabled="false"
> 		 thread_pool.queue_max_size="10"
> 		 thread_pool.rejection_policy="Run"
> 		 oob_thread_pool.enabled="true"
> 		 oob_thread_pool.min_threads="1"
> 		 oob_thread_pool.max_threads="4"
> 		 oob_thread_pool.keep_alive_time="30000"
> 		 oob_thread_pool.queue_enabled="true"
> 		 oob_thread_pool.queue_max_size="10"
> 		 oob_thread_pool.rejection_policy="Run"/>
>     <PING gossip_host="${jgroups.gossiprouter.ip:jgroupshost}"
> gossip_port="${jgroups.gossiprouter.port:3091}"
> 		    gossip_refresh="15000"
> 		    timeout="3000"
>             num_initial_members="3"/>
> 	
> 	<MERGE2 min_interval="5000" max_interval="10000"
> 		down_thread="false" up_thread="false"/>
> 	
> 	<FD_SOCK up_thread="false" down_thread="false"/>
> 	
>     <FD timeout="10000" max_tries="5" shun="true"/>
>     <VERIFY_SUSPECT timeout="1500"/>
> 	
>     <pbcast.NAKACK max_xmit_size="60000"
>                    use_mcast_xmit="false" gc_lag="0"
>                    retransmit_timeout="100,200,300,600,1200,2400,4800"
>                    discard_delivered_msgs="true"/>
> 	
>     <UNICAST timeout="300,600,1200,2400,3600"/>
> 	
>     <ENCRYPT key_store_name="keystore" store_password="xxx"
> key_password="xxx" alias="xxx"/>
> 	
>     <pbcast.STABLE stability_delay="1000" desired_avg_gossip="50000"
>                    max_bytes="400000"/>
> 	
>     <VIEW_SYNC avg_send_interval="60000"/>
> 	
> 	
> 	<AUTH auth_class="org.jgroups.auth.MD5Token"
>         auth_value="xxx"
>         token_hash="MD5"/>
> 		
>     <pbcast.GMS print_local_addr="true" join_timeout="5000"
>                 join_retry_timeout="2000" shun="true"/>
> 	
>      <FC max_credits="2000000"
>          min_threshold="0.10"/>
> 	
> 	<FRAG2 frag_size="60000"/>
> 	
>     <pbcast.STATE_TRANSFER  />
> </config>

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