4.2. Grouping API Operations

JBoss Data Grid normally uses the hash of a specific key to determine a destination node to store an entry. When using the Grouping API, JBoss Data Grid uses a hash of the group instead of the hash of the key to determine the destination node. However, the hash of the key is still used when actually storing the entry on a node.
It is important that each node is able to use an algorithm to determine the owner of each key, rather than pass metadata about the location of entries between nodes. As a result of this requirement, the group cannot be specified manually and must be either:
  • Intrinsic to the entry, which means it was generated by the key class.
  • Extrinsic to the entry, which means it was generated by an external function.
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