Hi,
We have a 2 node cluster. The only clustering is done through JBC, with configurations like the one below. We are seeing that when in one node there is a FullGC with a 10 seconds "Stop the world", requests in the other node get delayed by 10 seconds. Since we only have the cache shared between this 2 nodes, this has to be the cause.
Have anyone seen behaviour like this before? is it normal? how can I avoid it?

<mbean code="com.mycompany.som.cache.core.mbean.CoreCacheWithListener"
 name="jboss.cache:service=SOMCoreCache">

 <depends>jboss:service=Naming</depends>
 <depends>jboss:service=TransactionManager</depends>
 <depends>jboss.jca:name=jdbc/som,service=DataSourceBinding</depends>

 <depends>jboss:service=DeploymentService</depends>

 <attribute name="TransactionManagerLookupClass">
 org.jboss.cache.JBossTransactionManagerLookup
 </attribute>

 <attribute name="IsolationLevel">NONE</attribute>
 <attribute name="CacheMode">REPL_SYNC</attribute>
 <attribute name="UseReplQueue">false</attribute>
 <attribute name="ReplQueueInterval">0</attribute>
 <attribute name="ReplQueueMaxElements">0</attribute>
 <attribute name="ClusterName">SOMCoreCache-Cluster</attribute>

 <attribute name="ClusterConfig">
 <config>
 <!-- UDP: if you have a multihomed machine,
 set the bind_addr attribute to the appropriate NIC IP address, e.g bind_addr="192.168.0.2"
 -->
 <!-- UDP: On Windows machines, because of the media sense feature
 being broken with multicast (even after disabling media sense)
 set the loopback attribute to true -->
 <UDP mcast_addr="${jboss.cache.SOMCoreCache.addr:228.1.2.3}"
 mcast_port="${jboss.cache.SOMCoreCache.port:48866}" ip_ttl="64"
 ip_mcast="true" mcast_send_buf_size="150000"
 mcast_recv_buf_size="80000" ucast_send_buf_size="150000"
 ucast_recv_buf_size="80000" loopback="false" />
 <PING timeout="2000" num_initial_members="3" up_thread="false"
 down_thread="false" />
 <MERGE2 min_interval="10000" max_interval="20000" />
 <!-- <FD shun="true" up_thread="true" down_thread="true" />-->
 <FD_SOCK />
 <VERIFY_SUSPECT timeout="1500" up_thread="false"
 down_thread="false" />
 <pbcast.NAKACK gc_lag="50" retransmit_timeout="600,1200,2400,4800"
 max_xmit_size="8192" up_thread="false" down_thread="false" />
 <UNICAST timeout="600,1200,2400" down_thread="false" />
 <pbcast.STABLE desired_avg_gossip="20000" up_thread="false"
 down_thread="false" />
 <FRAG frag_size="8192" down_thread="false" up_thread="false" />
 <pbcast.GMS join_timeout="5000" join_retry_timeout="2000"
 shun="true" print_local_addr="true" />
 <pbcast.STATE_TRANSFER up_thread="true" down_thread="true" />
 </config>
 </attribute>

 <attribute name="FetchInMemoryState">true</attribute>
 <attribute name="InitialStateRetrievalTimeout">15000</attribute>
 <attribute name="SyncReplTimeout">15000</attribute>
 <attribute name="LockAcquisitionTimeout">10000</attribute>
 <attribute name="UseRegionBasedMarshalling">true</attribute>
 <attribute name="InactiveOnStartup">false</attribute>

 <attribute name="CacheLoaderConfiguration">
 <config>
 <passivation>false</passivation>
 <preload>/</preload>
 <shared>true</shared>
 <cacheloader>
 <class>org.jboss.cache.loader.JDBCCacheLoader</class>
 <properties>
 cache.jdbc.datasource=java:jdbc/som
 cache.jdbc.table.name=core_data
 cache.jdbc.table.create=true
 cache.jdbc.table.drop=false
 cache.jdbc.table.primarykey=jbosscache_pk
 cache.jdbc.fqn.column=fqn
 cache.jdbc.fqn.type=varchar(255)
 cache.jdbc.node.column=node
 cache.jdbc.node.type=blob
 cache.jdbc.parent.column=parent
 </properties>
 <async>true</async>
 <fetchPersistentState>true</fetchPersistentState>
 <ignoreModifications>false</ignoreModifications>
 </cacheloader>
 </config>
 </attribute>

 </mbean>
</server>