4.2. Grouping API Use Case

This feature allows logically related data to be stored on a single node. For example, if the cache contains user information, the information for all users in a single location can be stored on a single node.
The benefit of this approach is that when seeking specific (logically related) data, the Distributed Executor task is directed to run only on the relevant node rather than across all nodes in the cluster. Such directed operations result in optimized performance.

Example 4.1. Grouping API Example

Acme, Inc. is a home appliance company with over one hundred offices worldwide. Some offices house employees from various departments, while certain locations are occupied exclusively by the employees of one or two departments. The Human Resources (HR) department has employees in Bangkok, London, Chicago, Nice and Venice.
Acme, Inc. uses Red Hat JBoss Data Grid's Grouping API to ensure that all the employee records for the HR department are moved to a single node (Node AB) in the cache. As a result, when attempting to retrieve a record for a HR employee, the DistributedExecutor only checks node AB and quickly and easily retrieves the required employee records.
Storing related entries on a single node as illustrated optimizes the data access and prevents time and resource wastage by seeking information on a single node (or a small subset of nodes) instead of all the nodes in the cluster.
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