What is JGroups protocol?
The JGroups framework provides services to enable peer-to-peer communications between nodes in a cluster. It is built on top a stack of network communication protocols that provide transport, discovery, reliability and failure detection, and cluster membership management services.
What is JGroups in Java?
JGroups is a library for reliable one-to-one or one-to-many communication written in the Java language. It can be used to create groups of processes whose members send messages to each other. JGroups enables developers to create reliable multipoint (multicast) applications where reliability is a deployment issue.
Why TCP is used in Jgroup?
Compared with UDP, TCP generates more network traffic when the cluster size increases. TCP is fundamentally a unicast protocol. To send multicast messages, JGroups uses multiple TCP unicasts. To use TCP as a transport protocol, you should define a TCP element in the JGroups Config element.
What is Kube_ping?
KUBE_PING is a discovery protocol for JGroups cluster nodes managed by Kubernetes. Since Kubernetes is in charge of launching nodes, it knows the IP addresses of all pods it started, and is therefore the best place to ask for cluster discovery.
What is JBoss JGroups?
JBoss uses a tool called JGroups to enable peer-to-peer communication between nodes. JGroups is a toolkit for reliable multicast communication. It uses existing network infrastructure and protocols to transmit multicast messages that are reliable because receivers can request retransmission of lost packets of data.
How do I find other members of a TCP group?
The TCPPING protocol requires a static configuration, which assumes that you to know in advance where to find other members of your group. For dynamic discovery in a TCP-based stack, use the MPING protocol, which uses multicast discovery, or the TCPGOSSIP protocol, which contacts a Gossip Router to acquire the initial membership.
What is the tcpping protocol?
The TCPPING protocol defines a static cluster membership. The cluster members are retrieved by directly contacting the members listed in initial_hosts, sending point-to-point discovery requests. The TCPPING protocol defines a static configuration, which requires that you to know in advance where to find all of the members of your cluster.
How do I retrieve the initial membership of a group?
The TCPPING protocol layer retrieves the initial membership in answer to the GMS’s FIND_INITIAL_MBRS event. The initial membership is retrieved by directly contacting other group members, sending Messages containing point-to-point membership requests.
What ports does tcpping try to connect to?
Given the current values of port_range and initial_hosts above, the TCPPING layer will try to connect to hosta:2300, hosta:2301, hosta:2302, hostb:3400, hostb:3401, hostb:3402, hostc:4500, hostc:4501, hostc:4502. The configuration options allows for multiple nodes on the same host to be pinged.