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| Oracle Solaris Cluster Data Services Developer's Guide Oracle Solaris Cluster 4.1

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Chapter 12

## Cluster Reconfiguration Notification Protocol

This chapter provides information about the Cluster Reconfiguration Notification Protocol (CRNP). The CRNP enables failover and scalable applications to be “cluster aware.” More specifically, the CRNP provides a mechanism that enables applications to register for, and receive subsequent asynchronous notification of, Oracle Solaris Cluster reconfiguration events. Data services that run within the cluster and applications that run outside the cluster can register for notification of events. Events are generated when membership in a cluster changes and when the state of a resource group or a resource changes.

Note - The `SUNW.Event` resource type implementation provides highly available CRNP services on Oracle Solaris Cluster. The implementation of this resource type is described in more detail in the `SUNW.Event`(5) man page.

This chapter covers the following topics:

- CRNP Concepts

- How a Client Registers With the Server

- How the Server Replies to a Client

- How the Server Delivers Events to a Client

- How the CRNP Authenticates Clients and the Server

- Example of Creating a Java Application That Uses the CRNP

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