Memory-to-memory session partitioning

Session partitioning gives the administrator the ability to filter or reduce the number of destinations that the session object gets sent to by the replication service. You can also configure session partitioning by specifying the number of replicas on the replication domain. The Single replica option is chosen by default. Since the number of replicas is global for the entire replication domain, all the session managers connected to the replication domain use the same setting.

Single replica

You can replicate a session to only one other server, creating a single replica. When this option is chosen, a session manager picks another session manager that is connected to the same replication domain to replicate the HTTP session to during session creation. All updates to the session are only replicated to that single server. This option is set at the replication domain level. When this option is set, every session manager connected to this replication domain creates a single backup copy of HTTP session state information on a backup server.

Full group replica

Each object is replicated to every application server that is configured as a consumer of the replication domain. However, in the peer-to-peer mode, this topology is the most redundant because everyone replicates to everyone and as you add servers, more overhead (both CPU and memory) is needed to deal with replication. This mode is most useful for dynamic caching replication. Redundancy does not affect the client/server mode because clients only replicate to servers that are set to server mode.

Specific number of replicas

You can specify a specific number of replicas for any entry that is created in the replication domain. The number of replicas is the number of application servers that the user wants to use to replicate in the domain. This option eliminates redundancy that occurs in a full group replica and also provides additional backup than a single replica.  In peer-to-peer mode, the number of replicas cannot exceed the total number of application servers in the cluster. In the client/server mode, the number of replicas cannot exceed the total number of application servers in the cluster that are set to server mode.

Related concepts

Related Reference