RoundRobinPartitioning (EclipseLink 2.7.15, API Reference)

```
@Target({TYPE,METHOD,FIELD})
@Retention(RUNTIME)
public @interface RoundRobinPartitioning
```
RoundRobinPartitioning sends requests in a round robin fashion to the set of connection pools. It is for load-balancing read queries across a cluster of database machines. It requires that the full database be replicated on each machine, so does not support partitioning. The data should either be read-only, or writes should be replicated on the database.
Partitioning can be enabled on an Entity, relationship, query, or session/persistence unit. Partition policies are globally named to allow reuse, the partitioning policy must also be set using the @Partitioned annotation to be used.

See Also:

Partitioned, RoundRobinPartitioningPolicy

Author:

James Sutherland

Since:

EclipseLink 2.2

Required Element Summary

Required Elements
Modifier and Type Required Element Description

java.lang.String name
The name of the partition policy, names must be unique for the persistence unit.

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`java.lang.String[]`	`connectionPools`	List of connection pool names to load balance across.
`boolean`	`replicateWrites`	This allows for a set of database to be written to and kept in synch, and have reads load-balanced across the databases.

- Element Detail
  - name
```
java.lang.String name
```
    The name of the partition policy, names must be unique for the persistence unit.
- - connectionPools
```
java.lang.String[] connectionPools
```
    List of connection pool names to load balance across. Defaults to all defined pools in the ServerSession.
    
    Default:
    
    {}
- - replicateWrites
```
boolean replicateWrites
```
    This allows for a set of database to be written to and kept in synch, and have reads load-balanced across the databases.
    
    Default:
    
    false