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Comment: add link to Hadoop 2.4 ACL doc

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Note that through the use of HDFS ACL (available in Apache Hadoop 2.4 onwards) you have a lot of flexibility in controlling access to the file system, which in turn provides more flexibility with Storage Based Authorization. Also, note that you need the upcoming Hive 0.14 release to make use of the flexibility provided through HDFS ACL (HIVE-7583).

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