From heap file, what I see that leaks are coming from NAKACK2 protocol with UNICAST3 settings.

Jgroup version 4.0.13.Final.jar is causing memory leaks ------------------------------------------------------- Key: JGRP-2382 URL: https://issues.jboss.org/browse/JGRP-2382 Project: JGroups Issue Type: Feature Request Affects Versions: 4.0.13 Environment: AIX machine 7.1 with JDK 1.8 Reporter: Rashmi Acharya Assignee: Bela Ban Priority: Major We are observing a constant memory growth and leak with JGroup version 4.0.13 .. One of our customer is having two node cluster environment and in one node we are observing org.Group.Messages which contain org.groups.Header and org.groups.Stack.ipAddress objects.. these are not getting cleared from memory.. We dont see any exception related to Jgroups from logs and but it is causing a gradual emory growth and OOM. Here is the Jgroups cluster configuration we have: dynamic.cluster.property_string <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:org:jgroups" xsi:schemaLocation="urn:org:jgroups http://www.jgroups.org/schema/jgroups.xsd"> <TCP bind_addr="&HOST_ADDR;" bind_port="&MULTICAST_NODE_PORT2;"/> <TCPPING async_discovery="true" initial_hosts="&CLUSTER_INITIAL_HOSTS;" port_range="0" send_cache_on_join="true"/> <MERGE3 min_interval="3000" max_interval="5000" /> <FD_ALL timeout="20000" interval="15000"/> <FD_SOCK/> <FD timeout="5000" max_tries="48" /> <VERIFY_SUSPECT timeout="1500"/> <BARRIER/> <pbcast.NAKACK2 use_mcast_xmit="false" discard_delivered_msgs="true"/> <UNICAST3/> <pbcast.STABLE desired_avg_gossip="20000" max_bytes="0" stability_delay="1000"/> <pbcast.GMS print_local_addr="true" join_timeout="15000" /> </config> ================================= dynamic.cluster.distribution_property_string <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:org:jgroups" xsi:schemaLocation="urn:org:jgroups http://www.jgroups.org/schema/jgroups.xsd"> <TCP bind_port="&MULTICAST_NODE_PORT1;" /> <TCPPING async_discovery="true" initial_hosts="&CLUSTER_INITIAL_HOSTS;" port_range="0" send_cache_on_join="true"/> <MERGE3 min_interval="3000" max_interval="5000"/> <FD_SOCK/> <FD timeout="5000" max_tries="48"/> <VERIFY_SUSPECT timeout="1500"/> <BARRIER/> <pbcast.NAKACK2 use_mcast_xmit="false" discard_delivered_msgs="true"/> <UNICAST3/> <pbcast.STABLE desired_avg_gossip="20000" max_bytes="0" stability_delay="1000" /> <pbcast.GMS print_local_addr="true" join_timeout="5000"/> </config> ================================ dynamic.cluster.lock.protocolStack <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="urn:org:jgroups" xsi:schemaLocation="urn:org:jgroups http://www.jgroups.org/schema/jgroups.xsd"> <TCP bind_addr="&HOST_ADDR;" bind_port="&MULTICAST_NODE_PORT3;"/> <TCPPING async_discovery="true" initial_hosts="&CLUSTER_INITIAL_HOSTS;" port_range="0" send_cache_on_join="true"/> <MERGE3 min_interval="3000" max_interval="5000"/> <FD_ALL timeout="20000" interval="5000"/> <FD timeout="5000" max_tries="48"/> <VERIFY_SUSPECT timeout="1500"/> <BARRIER/> <pbcast.NAKACK2 use_mcast_xmit="false" discard_delivered_msgs="true"/> <UNICAST3 /> <pbcast.STABLE desired_avg_gossip="20000" /> <pbcast.GMS print_local_addr="true" join_timeout="5000"/> <FRAG2 frag_size="8096"/> <CENTRAL_LOCK2/> </config>