-
Sometimes the only way to interact with the upstream data source is to use a library provided by the vendor. To use a library like that from q you need to write a plugin, and these plugins have a chance to crash unlike pure q code. Also you can’t just reimplement/reverse engineer the network protocol because as of 4.0 q still doesn’t have native raw TCP support. So even if the feed handler is a q app with a plugin, it is best kept as its own process to isolate the impact of a crash.