JGroups - A Toolkit for Reliable Messaging

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• Cluster creation and deletion. Cluster nodes can be spread across LANs or WANs
• Joining and leaving of clusters
• Membership detection and notification about joined/left/crashed cluster nodes
• Detection and removal of crashed nodes
• Sending and receiving of node-to-cluster messages (point-to-multipoint)
• Sending and receiving of node-to-node messages (point-to-point)

The most powerful feature of JGroups is its flexible protocol stack, which allows developers to adapt it to exactly match their application requirements and network characteristics.
The benefit of this is that you only pay for what you use. By mixing and matching protocols, various differing application requirements can be satisfied.
JGroups comes with a large number of protocols (but anyone can write their own), for example

• Transport protocols: UDP (IP Multicast) or TCP
• Fragmentation of large messages
• Reliable unicast and multicast message transmission. Lost messages are retransmitted
• Failure detection: crashed nodes are excluded from the membership
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• Ordering protocols: FIFO, Total Order
• Membership
• Encryption
• Compression

JGroups allows developers to create reliable messaging (one-to-one or one-to-many) applications where reliability is a deployment issue, and does not have to be implemented by the application developer. This saves application developers significant amounts of time, and allows for the application to be deployed in different environments, without having to change code.

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