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Cluster topology is an ordered set of client and server nodes at a certain point in time. Each stable topologhe first node in the list corresponds to the primary node, and other nodes arey topolog is assigned a topology version number - monotonically increasing pair of counters (majorVer, minorVer). Major version is used for tracking grid node events such join, left or fail, minor version is used for tracking internal events such cache start or activation. Each node maintains a list of nodes in the topology, and it is the same on all nodes for a given version. It is important to note that each node receives information about topology changes at different times, meaning that at any point in time, nodes can see different topology versions, but eventually they will all see the same.

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