安道生練功房 - 分享經驗，累積智慧

自JForum 2.2.0起嘗試開始支援Cluster，目前先使用JBoss Cache作為預設的Cache引擎，因此預設是會啟動JBoss Cache，透過JGroups的UDP mcast來做資料複寫，如果您在同一台主機上需要安裝第二套的JForum，則第二套的JForum需要記得修改mcast_addr這個參數，以避免與第一套JForum所使用的JBoss Cache重疊到，例如：

      <jgroupsConfig>

         <UDP discard_incompatible_packets="true" enable_bundling="false" enable_diagnostics="false" ip_ttl="2"

              loopback="false" max_bundle_size="64000" max_bundle_timeout="30" mcast_addr="228.10.10.11"

              mcast_port="45588" mcast_recv_buf_size="25000000" mcast_send_buf_size="640000"

              oob_thread_pool.enabled="true" oob_thread_pool.keep_alive_time="10000" oob_thread_pool.max_threads="4"

              oob_thread_pool.min_threads="1" oob_thread_pool.queue_enabled="true" oob_thread_pool.queue_max_size="10"

              oob_thread_pool.rejection_policy="Run" thread_naming_pattern="pl" thread_pool.enabled="true"

              thread_pool.keep_alive_time="30000" thread_pool.max_threads="25" thread_pool.min_threads="1"

              thread_pool.queue_enabled="true" thread_pool.queue_max_size="10" thread_pool.rejection_policy="Run"

              tos="8" ucast_recv_buf_size="20000000" ucast_send_buf_size="640000" use_concurrent_stack="true"

              use_incoming_packet_handler="true"/>

         <PING num_initial_members="3" timeout="2000"/>

         <MERGE2 max_interval="30000" min_interval="10000"/>

         <FD_SOCK/>

         <FD max_tries="5" shun="true" timeout="10000"/>

         <VERIFY_SUSPECT timeout="1500"/>

         <pbcast.NAKACK discard_delivered_msgs="true" gc_lag="0" retransmit_timeout="300,600,1200,2400,4800"

                        use_mcast_xmit="false"/>

         <UNICAST timeout="300,600,1200,2400,3600"/>

         <pbcast.STABLE desired_avg_gossip="50000" max_bytes="400000" stability_delay="1000"/>

         <pbcast.GMS join_timeout="5000" print_local_addr="true" shun="false" view_ack_collection_timeout="5000"

                     view_bundling="true"/>

         <FRAG2 frag_size="60000"/>

         <pbcast.STREAMING_STATE_TRANSFER/>

         <pbcast.FLUSH timeout="0"/>



      </jgroupsConfig>

這樣子才不會影響到第一套JForum的JBoss Cache。