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Short answer, to my understanding, is that feed handler isn’t quite a good use case for KDB.
A feed handler needs to deal with data sources of various forms, and more generic languages like Java and C++ usually have richer support for those. Another thing to consider is parallel processing of those data feeds, which will be cumbersome if done in KDB given that in a usual setup, there is only one main thread processing incoming requests and the parallelism would call for a cluster of KDB processes.