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

[Bela Ban (JIRA)]

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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