A.3. UDP Default and Recommended Values To learn more about JGroups and using TCP and UDP, see Section 26.2, "Configure JGroups (Library Mode)" . Note Values in JGroups Default Value indicate values that are configured internally to JGroups, but may be overridden by a custom configuration file or by a JGroups configuration file shipped with JBoss Data Grid. Values in JBoss Data Grid Configured Values indicate values that are in use by default when using one of the configuration files for JGroups as shipped with JBoss Data Grid. It is recommended to use these values when custom configuration files for JGroups are in use with JBoss Data Grid. For more information on the configuration files included with JBoss Data Grid refer to Section A.4, "JBoss Data Grid JGroups Configuration Files" . Table A.16. Recommended Values for UDP Parameter JGroups Default Value JBoss Data Grid Configured Values bind_addr Any non-loopback Set address on specific interface bind_port Any free port Set specific port loopback true true port_range 50 Set based on desired range of ports mcast_addr 228.8.8.8 Same as default mcast_port 7600 Same as default tos 8 Same as default ucast_recv_buf_size 64,000 20,000,000 ucast_send_buf_size 100,000 1,000,000 mcast_recv_buf_size 500,000 25,000,000 mcast_send_buf_size 100,000 1,000,000 ip_ttl 8 2 thread_naming_pattern cl pl max_bundle_size 64,000 Same as default enable_diagnostics true false thread_pool.enabled true Same as default thread_pool.min_threads 2 This should equal the number of nodes. thread_pool.max_threads 30 This should be higher than thread_pool.min_threads. For example, for a smaller grid (2-10 nodes), set this value to twice the number of nodes, but for a larger grid (20 or more nodes), the ratio should be lower. As an example, if a grid contains 20 nodes, set this value to 25 and if the grid contains 100 nodes, set the value to 110. thread_pool.keep_alive_time 30,000 60,000 thread_pool.queue_enabled true false thread_pool.queue_max_size 500 None, queue should be disabled thread_pool.rejection_policy Discard Same as default internal_thread_pool.enabled true Same as default internal_thread_pool.min_threads 2 5 internal_thread_pool.max_threads 4 20 internal_thread_pool.keep_alive_time 30,000 60,000 internal_thread_pool.queue_enabled true false internal_thread_pool.rejection_policy Discard Abort oob_thread_pool.enabled true Same as default oob_thread_pool.min_threads 2 20 or higher oob_thread_pool.max_threads 10 200 or higher based on the load oob_thread_pool.keep_alive_time 30,000 60,000 oob_thread_pool.queue_enabled true false oob_thread_pool.queue_max_size 500 None, queue should be disabled oob_thread_pool.rejection_policy Discard Same as default Note In JGroups 3.5, the PING timeout value is removed and the pbcast.GMS join_timeout value indicates the timeout period instead. Table A.17. Recommended Values for MERGE3 Parameter JGroups Default Value JBoss Data Grid Configured Values min_interval 1,000 10,000 max_interval 10,000 30,000 Table A.18. Recommended Values for FD_SOCK Parameter JGroups Default Value JBoss Data Grid Configured Values client_bind_por 0 (randomly selects a port and uses it) Same as default get_cache_timeout 1000 milliseconds Same as default keep_alive true Same as default num_tries 3 Same as default start_port 0 (randomly selects a port and uses it) Same as default suspect_msg_interval 5000 milliseconds. Same as default Table A.19. Recommended Values for FD_ALL Parameter JGroups Default Value JBoss Data Grid Configured Values timeout 40,000 60,000. The FD_ALL timeout value is set to two times the longest possible stop the world garbage collection pause in the CMS garbage collector. In a well-tuned JVM, the longest pause is proportional to heap size and should not exceed 1 second per GB of heap. For example, an 8GB heap should not have a pause longer than 8 seconds, so the FD_ALL timeout value must be set to 16 seconds. If longer garbage collection pauses are used, then this timeout value should be increased to avoid false failure detection on a node. interval 8,000 15,000. The FD_ALL interval value must be at least four times smaller than the value set for FD_ALL's timeout value. timeout_check_interval 2,000 5,000 Table A.20. Recommended Values for FD_HOST Parameter JGroups Default Value JBoss Data Grid Configured Values check_timeout 3,000 5,000 cmd InetAddress.isReachable() (ICMP ping) - interval 20,000 15,000. The interval value for FD_HOST must be four times smaller than FD_HOST's timeout value. timeout - 60,000. Table A.21. Recommended Values for VERIFY_SUSPECT Parameter JGroups Default Value JBoss Data Grid Configured Values timeout 2,000 5,000 Table A.22. Recommended Values for pbcast.NAKACK2 Parameter JGroups Default Value JBoss Data Grid Configured Values use_mcast_xmit true false xmit_interval 1,000 Same as default xmit_table_num_rows 50 50 xmit_table_msgs_per_row 10,000 1,024 xmit_table_max_compaction_time 10,000 30,000 max_msg_batch_size 100 Same as default resend_last_seqno false true Table A.23. Recommended Values for UNICAST3 Parameter JGroups Default Value JBoss Data Grid Configured Values xmit_interval 500 Same as default xmit_table_num_rows 100 50 xmit_table_msgs_per_row 1,0000 1,024 xmit_table_max_compaction_time 600,000 30,000 max_msg_batch_size 500 100 conn_close_timeout 60,000 No recommended value conn_expiry_timeout 120,000 0 Table A.24. Recommended Values for pbcast.STABLE Parameter JGroups Default Value JBoss Data Grid Configured Values stability_delay 6,000 500 desired_avg_gossip 20,000 5,000 max_bytes 2,000,000 1,000,000 Table A.25. Recommended Values for pbcast.GMS Parameter JGroups Default Value JBoss Data Grid Configured Values print_local_addr true false join_timeout 5,000 15,000 view_bundling true Same as default Table A.26. Recommended Values for UFC Parameter JGroups Default Value JBoss Data Grid Configured Values max_credits 500,000 2,000,000 min_threshold 0.40 Same as default Table A.27. Recommended Values for MFC Parameter JGroups Default Value JBoss Data Grid Configured Values max_credits 500,000 2,000,000 min_threshold 0.40 Same as default Table A.28. Recommended Values for FRAG2 Parameter JGroups Default Value JBoss Data Grid Configured Values frag_size 60,000 Same as default Table A.29. Recommended Values for ENCRYPT Parameter JGroups Default Value JBoss Data Grid Configured Values asymAlgorithm RSA - asymInit 512 - asymProvider Bouncy Castle Provider - changeKeysOnViewChange false - symAlgorithm AES - symInit 128 - symProvider Bouncy Castle Provider - Note See the Red Hat JBoss Data Grid Developer Guide 's JGroups ENCRYPT section for details. Recommended Values for SASL See the Red Hat JBoss Data Grid Developer Guide 's User Authentication over Hot Rod Using SASL section for details. Recommended Values for RELAY2 See Chapter 31, Set Up Cross-Datacenter Replication for details. Report a bug

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