There should been no blocking operation. At least, we have the same codebase and same sample data in the two test cases.

In fact, our application is based on OpenResty with local redis instances. On the 32 cores server, we have 22 nginx workers and 8 local redis instances(shards). The lua codes should have rather simple business logic. It accepts http requests, loads data from local redis via unix domain sockets, do the simple transformation, and then write to the response.