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Table of Contents

Overview

The WAN gateway allows 2 distinct data centers, or 2 availability zones, to maintain data consistency. In the case where one data center cannot process incoming events for any reason, the other data center should retain events so that no data is lost. Currently if one site can connect to another and send it events, those events are removed from the queue when the ack is received, regardless of what happens to them on the remote site. This behavior is controlled by the system property REMOVE_FROM_QUEUE_ON_EXCEPTION which defaults to true. It is unacceptable to simply store events that did not get successfully processed on the receiving end somewhere without replaying them. Customer needs to only know what events did not get transmitted. Most common exceptions thrown from a receiving site include:

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