drcrallen commented on issue #6942: Shade Guava manually URL: https://github.com/apache/incubator-druid/issues/6942#issuecomment-465662283 One of the challenges I've faced with shading is that it becomes very hard to figure out which version of a library is actually deployed in a production cluster. With reflection, the jars are kept separate and it is easier to debug exactly which version things are coming from. With shading you loose the version information, and can accidentally shade (or neglect to shade) things which should not have (or should have) been shaded. In such scenarios tracking down which version of what libs are getting pulled into which dependencies at what point in the build and deploy process is a huge pain. It is much easier to go "Oh, I see version X.Y.Z and X.Q.R in the `lib` dir, those must have a conflict" and then work out how to make them play nice together.
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