ulysses-you commented on a change in pull request #993:
URL: https://github.com/apache/incubator-kyuubi/pull/993#discussion_r697205879



##########
File path: 
kyuubi-server/src/main/scala/org/apache/kyuubi/engine/spark/SparkProcessBuilder.scala
##########
@@ -58,7 +58,9 @@ class SparkProcessBuilder(
     sparkHomeOpt.map{ dir =>
       Paths.get(dir, "bin", 
SPARK_SUBMIT_FILE).toAbsolutePath.toFile.getCanonicalPath
     }.getOrElse {
-      throw KyuubiSQLException("SPARK_HOME is not set!")
+      throw KyuubiSQLException("SPARK_HOME is not set! " +
+        "For more detail information on installing and configuring Spark, 
please visit " +
+        "https://kyuubi.apache.org/docs/stable/deployment/index.html";)

Review comment:
       refer the docs is good idea. how about use the more accurate url: 
`https://kyuubi.apache.org/docs/stable/deployment/settings.html#environments`.
   And seems we should also update the docs.




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