Oracle Corporation
Direct message retrieval in distributed messaging systems

Abstract:

A messaging service may be distributed in a cluster of nodes such that each node includes an instance of the messaging service. To ensure that messages are not lost in the messaging service through a load balancer, addresses for each of the nodes may be accessed, and messages may be retrieved from individual instances of the messaging service by addressing the nodes directly and bypassing the load balancer. To retrieve messages, a client may cycle through the node addresses and retrieve messages until each corresponding message queue is empty. Once a message queue is empty, the client may stop sending requests to the corresponding node until the message queues on the other nodes have been emptied. Various request patterns may be used to cycle through node addresses, including Round Robin patterns and patterns that correspond to traffic patterns seen by the load balancer.