Message Server Communication 
Use
This function is used for establishing communication through the Message Server. On a Cluster Manager level a verification is made of the threshold value of the message body size. If the size is below the threshold value, the message is sent through the Message Server. If the size is above this value, the connection is through lazy communication.
When one cluster element wants to send a message, the system checks whether there is a Lazy Connection open. If there is such connection, the message is sent though it.
Features
The communication through the Message Server is accomplished with the help of a message library that is responsible for the communication protocol. The Message Server receives the message, reads its header to find who must receive it, and then sends it to one or several cluster elements. Each cluster element then decides which listener element to process the message.
The Message Server communication has a failover mechanism implemented. The Message Server must return a confirmation for each message, sent through the message library, that the message is received and is sent to the corresponding recipient. In case the Message Server stops before the message is send to the recipient, the message library will know that the message is not sent and will send it again when the Message Server is up and running. If there is no such failover mechanism, the message will not be processed and will be lost.
See also:
Configuring Message Server Communication in the Administration Manual