Virtual nodes

Overview of virtual nodes (vnodes).

Vnodes simplify many tasks in Cassandra:

You no longer have to calculate and assign tokens to each node.
Rebalancing a cluster is no longer necessary when adding or removing nodes. When a node joins the cluster, it assumes responsibility for an even portion of data from the other nodes in the cluster. If a node fails, the load is spread evenly across other nodes in the cluster.
Rebuilding a dead node is faster because it involves every other node in the cluster.
Improves the use of heterogeneous machines in a cluster. You can assign a proportional number of vnodes to smaller and larger machines.

For more information, see the article Virtual nodes in Cassandra 1.2 and Enabling virtual nodes on an existing production cluster.

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