For me it was creating a work queue with simultaneous workers and dependencies between work items. It processed CSV files, put the data in query-able tables. Some tables depended on data from other tables. And the data was not necessarily clean so I had to validate it and store the validation problems. It was interesting to explore the multi-threading aspect, solve queue dependency ordering, and other challenges. At one point I was able to completely saturate our database's CPU and remember feeling proud of that. (Although I think that turned out to be something I fixed later.)
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For me it was creating a work queue with simultaneous workers and dependencies between work items. It processed CSV files, put the data in query-able tables. Some tables depended on data from other tables. And the data was not necessarily clean so I had to validate it and store the validation problems. It was interesting to explore the multi-threading aspect, solve queue dependency ordering, and other challenges. At one point I was able to completely saturate our database's CPU and remember feeling proud of that. (Although I think that turned out to be something I fixed later.)