[GitHub] [spark] srowen commented on a change in pull request #26796: [SPARK-30164][Tests][Doc] SBT clean before document generation

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srowen commented on a change in pull request #26796: [SPARK-30164][Tests][Doc] SBT clean before document generation
URL: https://github.com/apache/spark/pull/26796#discussion_r355192178
 
 

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 File path: docs/README.md
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 @@ -83,7 +83,7 @@ $ PRODUCTION=1 jekyll build
 
 ## API Docs (Scaladoc, Javadoc, Sphinx, roxygen2, MkDocs)
 
-You can build just the Spark scaladoc and javadoc by running `./build/sbt unidoc` from the `$SPARK_HOME` directory.
+You can build just the Spark scaladoc and javadoc by running `./build/sbt clean unidoc` from the `$SPARK_HOME` directory.
 
 Review comment:
   I can imagine adding this to the docs, as users might have stale compiled code locally or something. How often would it occur in run-tests? In PR builders it starts with a clean build and I'd guess users recompile before tests. I'm also worried about slowdown for the PR builders.

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