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Learning AWS - Second Edition by Amit Shah, Aurobindo Sarkar

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Encryption

EMR supports end-to-end encryption for a variety of different frameworks. You can configure all this in a couple of clicks. You can do S3 server-side or client-side encryption, encrypt all the local disks of your cluster so any executor spills or HDFS blocks getting written get encrypted on the local disk filesystem. You can also encrypt Spark, Tez, MapReduce, HBase, Hive, Presto, and Pig for all the data blocks in flight. 

For more details on encrypting data-at-rest and data-in-transit, refer to AWS documentation: https://docs.aws.amazon.com/emr/latest/ManagementGuide/emr-data-encryption.html. 

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