Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/21659#discussion_r200869393
--- Diff: python/docs/Makefile ---
@@ -1,19 +1,44 @@
# Makefile for Sphinx documentation
#
+ifndef SPHINXBUILD
+ifndef SPHINXPYTHON
+SPHINXBUILD = sphinx-build
+endif
+endif
+
+ifdef SPHINXBUILD
+# User-friendly check for sphinx-build.
+ifeq ($(shell which $(SPHINXBUILD) >/dev/null 2>&1; echo $$?), 1)
+$(error The '$(SPHINXBUILD)' command was not found. Make sure you have
Sphinx installed, then set the SPHINXBUILD environment variable to point to the
full path of the '$(SPHINXBUILD)' executable. Alternatively you can add the
directory with the executable to your PATH. If you don't have Sphinx installed,
grab it from http://sphinx-doc.org/)
+endif
+else
+# Note that there is an issue with Python version and Sphinx in PySpark
documentation generation.
+# Please remove this check below when this issue is fixed. See SPARK-24530
for more details.
+PYTHON_VERSION_CHECK = $(shell $(SPHINXPYTHON) -c 'import sys;
print(sys.version_info < (3, 0, 0))')
--- End diff --
Can we fix the `SPHINXPYTHON` to python3 in release script
`release-build.sh`?
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