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[SPARK-29924][DOCS] Document Apache Arrow JDK11 requirement #27356

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[SPARK-29924][DOCS] Document Apache Arrow JDK11 requirement #27356

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Expand Up @@ -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
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