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Published : Oct 28, 2020
This blip is not on the current edition of the Radar. If it was on one of the last few editions, it is likely that it is still relevant. If the blip is older, it might no longer be relevant and our assessment might be different today. Unfortunately, we simply don't have the bandwidth to continuously review blips from previous editions of the Radar. Understand more
Oct 2020
Trial ?

As many more companies migrate away from their legacy systems, we feel it's worth highlighting an alternative to change data capture (CDC) as a mechanism for getting data from these systems. Martin Fowler described event interception back in 2004. In modern terms it involves forking requests on ingress to a system so that it's possible to gradually build a replacement. Often this is done by copying events or messages but forking HTTP requests is equally valid. Examples include forking events from point-of-sale systems before they're written to a mainframe and forking payment transactions before they're written to a core banking system. Both lead to the gradual replacement of parts of the legacy systems. We feel that as a technique, obtaining state changes from the source, rather than trying to recreate them postprocessing using CDC, has been overlooked which is why we're highlighting it in this issue of the Radar.

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