Proxy – a managed Coherence server that is storage-disabled and allows external clients (non-cluster members) to use a cache. A Coherence application GAR is packaged within an EAR and deployed on storage-disabled managed Coherence servers. Storage-disabled – a managed Coherence server that is not responsible for storing data and is used to host Coherence applications (cache clients). Coherence applications are packaged as Grid ARchives (GAR) and deployed on storage-enabled managed Coherence servers. Storage-enabled – a managed Coherence server that is responsible for storing data in the cluster. A best practice is to use different managed server instances (and preferably different WebLogic Server clusters) for each cluster role. Managed Coherence servers are distinguished by their role in the cluster. The Administration Server is typically not used as a managed Coherence server in a production environment. The use of Coherence servers, a resource defined in the previous ActiveCache integration, is deprecated and supported for backwards compatibility. Managed Coherence servers are specific to the WebLogic server Coherence integration. Managed Coherence servers are not the same as Coherence servers. Standalone JVM cluster members cannot be managed within a WebLogic Server domain.

Managed Coherence servers that are managed within a WebLogic Server domain must not join an external Coherence cluster comprised of standalone JVM cluster members. The Summary of Coherence Clusters screen displays and the Coherence Clusters table lists the cluster resource. For details on configuring the clustering mode, see Configure Cluster Communication.įrom the Coherence Cluster Members section, click to select the managed Coherence servers or WebLogic Server clusters that are to be part of the Coherence cluster or skip this section if managed Coherence servers and WebLogic Clusters are yet to be defined.Ĭlick Finish. When using multicast, select a default address and port to be used by all cluster. When using Unicast, select a default port to be used by all cluster members (typically 8088). The default settings are only recommended for development and testing environments. Click Next.įrom the Coherence Cluster Addressing section, select the clustering mode or keep the default settings. Managed Coherence servers are typically setup in tiers that are based on their type: a data tier for storing data, an application tier for hosting applications, and a proxy tier that allows external clients to access caches.įigure 12-1 shows a conceptual view of a Coherence cluster in a WebLogic Server domain:įrom the WebLogic Server Administration Console Domain Structure pane, expand Environment and click Coherence Clusters.įrom the Summary of Coherence Clusters page, click New.įrom the Create a Coherence Cluster Configuration page, enter a name for the cluster using the Name field. Managed Coherence servers can be explicitly associated with a Coherence cluster or they can be associated with a WebLogic Server cluster that is associated with a Coherence cluster. Managed servers that are configured as Coherence cluster members are referred to as managed Coherence servers. Multiple WebLogic Server clusters can be associated with a Coherence cluster and a WebLogic Server domain typically contains a single Coherence cluster. They use different clustering protocols and are configured separately. An application interacts with the data in a local cache and the distribution and backup of the data is automatically performed across cluster members.Ĭoherence clusters are different than WebLogic Server clusters. Coherence clusters consist of multiple managed Coherence server instances that distribute data in-memory to increase application scalability, availability, and performance.

External coherence meaning