[GitHub] [spark] srowen commented on a change in pull request #27534: [SPARK-30879][DOCS] Refine workflow for building docs

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srowen commented on a change in pull request #27534: [SPARK-30879][DOCS] Refine workflow for building docs
URL: https://github.com/apache/spark/pull/27534#discussion_r387158036
 
 

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 File path: docs/README.md
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 @@ -58,7 +84,7 @@ Note: Other versions of roxygen2 might work in SparkR documentation generation b
 To generate API docs for any language, you'll need to install these libraries:
 
 ```sh
-$ sudo pip install sphinx mkdocs numpy
+pip install sphinx==2.3.1 mkdocs==1.0.4 numpy==1.18.1
 
 Review comment:
   I guess I'd default to pinning the version in the absence of a strong argument either way. I do think we've had inconsistencies in the spark-website project due to differing jekyll versions, for example. 

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