SAP Message Server - What does it do in a HA Cluster ?

Message Service is responsible for the following tasks in the Java cluster:

  • Notification of events that arise in the cluster, for example, if a cluster node gets lost (through failure or shutdown of the instance), or when a service is started or stopped.
  • Communication between different services
  • Forwarding of messages and requests to all participants (broadcast)
  • Prepare logon information for the SAP Web Dispatcher (see Load Balancing Between Many Java Instances)
  • Support for Message Server failover
  • Guaranteed message transmission
  • Exchange of cache information in the cluster

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