drake is a package for orchestrating R workflows. Suppose I have some data in S3 that I want to pull into R through a drake plan. In this post I’ll use the S3 object’s ETag to make drake only re-download the data if it’s changed. This covers the scenario in which the object name in S3 stays the same. If I had, say, data being uploaded each day with an object name suffixed with the date, then I wouldn’t bother checking for any changes.
