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

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>