HyukjinKwon commented on code in PR #37799:
URL: https://github.com/apache/spark/pull/37799#discussion_r963181213


##########
docs/index.md:
##########
@@ -40,8 +40,8 @@ source, visit [Building Spark](building-spark.html).
 Spark runs on both Windows and UNIX-like systems (e.g. Linux, Mac OS), and it 
should run on any platform that runs a supported version of Java. This should 
include JVMs on x86_64 and ARM64. It's easy to run locally on one machine --- 
all you need is to have `java` installed on your system `PATH`, or the 
`JAVA_HOME` environment variable pointing to a Java installation.
 
 Spark runs on Java 8/11/17, Scala 2.12/2.13, Python 3.7+ and R 3.5+.
+Java 11/17 is the recommended version to run Spark on.

Review Comment:
   I wonder if we explicitly mention this though. Some benchmark results 
weren't good actually IIRC.



##########
docs/index.md:
##########
@@ -40,8 +40,8 @@ source, visit [Building Spark](building-spark.html).
 Spark runs on both Windows and UNIX-like systems (e.g. Linux, Mac OS), and it 
should run on any platform that runs a supported version of Java. This should 
include JVMs on x86_64 and ARM64. It's easy to run locally on one machine --- 
all you need is to have `java` installed on your system `PATH`, or the 
`JAVA_HOME` environment variable pointing to a Java installation.
 
 Spark runs on Java 8/11/17, Scala 2.12/2.13, Python 3.7+ and R 3.5+.
+Java 11/17 is the recommended version to run Spark on.

Review Comment:
   I wonder if we should explicitly mention this though. Some benchmark results 
weren't good actually IIRC.



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