HyukjinKwon 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_r385479036
 
 

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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:
   Hm, there's tradeoff to pin the version (test and fix it compatible first vs 
easily breaking). I think we haven't faced any notable problem so far to 
maintain those implicit compatibility across versions. What about we pin the 
version when actually we see some overhead to maintain this?

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