HyukjinKwon commented on a change in pull request #31559:
URL: https://github.com/apache/spark/pull/31559#discussion_r578103327



##########
File path: dev/run-tests.py
##########
@@ -240,18 +240,19 @@ def run_sparkr_style_checks():
 
 def build_spark_documentation():
     set_title_and_block("Building Spark Documentation", "BLOCK_DOCUMENTATION")
-    os.environ["PRODUCTION"] = "1 jekyll build"
+    os.environ["PRODUCTION"] = "1"
 
     os.chdir(os.path.join(SPARK_HOME, "docs"))
 
-    jekyll_bin = which("jekyll")
+    bundle_bin = which("bundle")
 
-    if not jekyll_bin:
-        print("[error] Cannot find a version of `jekyll` on the system; 
please",
-              " install one and retry to build documentation.")
+    if not bundle_bin:
+        print("[error] Cannot find a version of `bunlde` on the system; 
please",

Review comment:
       ```suggestion
           print("[error] Cannot find a version of `bundle` on the system; 
please",
   ```




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