From ed7f624ed18e2c7dabb121abce75d4a29142a27a Mon Sep 17 00:00:00 2001
From: Dongjoon Hyun <dhyun@apple.com>
Date: Fri, 24 Jan 2020 10:46:52 -0800
Subject: [PATCH] [SPARK-29924][DOCS] Add Apache Arrow requirement in Java 11

---
 docs/index.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/index.md b/docs/index.md
index d86471d56d5d9..f6ec595231f9e 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -52,6 +52,8 @@ For the Scala API, Spark {{site.SPARK_VERSION}}
 uses Scala {{site.SCALA_BINARY_VERSION}}. You will need to use a compatible Scala version
 ({{site.SCALA_BINARY_VERSION}}.x).
 
+For Java 11, `-Dio.netty.tryReflectionSetAccessible=true` is required additionally for Apache Arrow library. This prevents `java.lang.UnsupportedOperationException: sun.misc.Unsafe or java.nio.DirectByteBuffer.(long, int) not available` when Apache Arrow uses Netty internally.
+
 # Running the Examples and Shell
 
 Spark comes with several sample programs.  Scala, Java, Python and R examples are in the