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24.3.2. Pre-Configured JGroups Files
Red Hat JBoss Data Grid ships with a number of pre-configured JGroups files packaged in
infinispan-core.jar, and are available on the classpath by default. In order to use one of these files, specify one of these file names instead of using jgroups.xml.
The JGroups configuration files shipped with JBoss Data Grid are intended to be used as a starting point for a working project. JGroups will usually require fine-tuning for optimal network performance.
Available configurations are:
jgroups-udp.xmljgroups-tcp.xmljgroups-ec2.xml
24.3.2.1. jgroups-udp.xml
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jgroups-udp.xml is a pre-configured JGroups file in Red Hat JBoss Data Grid. The jgroups-udp.xml configuration
- uses UDP as a transport and UDP multicast for discovery.
- is suitable for large clusters (over 8 nodes).
- is suitable if using Invalidation or Replication modes.
The behavior of some of these settings can be altered by adding certain system properties to the JVM at startup. The settings that can be configured are shown in the following table.
| System Property | Description | Default | Required? |
|---|---|---|---|
| jgroups.udp.mcast_addr | IP address to use for multicast (both for communications and discovery). Must be a valid Class D IP address, suitable for IP multicast. | 228.6.7.8 | No |
| jgroups.udp.mcast_port | Port to use for multicast socket | 46655 | No |
| j jgroups.udp.ip_ttl | Specifies the time-to-live (TTL) for IP multicast packets. The value here refers to the number of network hops a packet is allowed to make before it is dropped | 2 | No |
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