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https://issues.apache.org/jira/browse/HADOOP-13075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15839534#comment-15839534
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Steve Loughran commented on HADOOP-13075:
-----------------------------------------

Regarding {{SERVER_SIDE_ENCRYPTION_ALGORITHM}}

That is an attribute in a public/evolving set of constants and must considered 
immutable on the basis that "people may be using it in their own code". That's 
what the public constants are, be it {{YarnConfiguration}}, 
{{HdfsConfiguration}} or somewhere else. They are constants to use when 
programatically setting/getting constants, so allowing you to avoid typos in 
your own use, and allow IDE support (completion, find-usages-of). 

While a major release gives you the freedom to remove things, it doesn't give 
you the obligation. If you look at HDFS-6418 you can see my unbounded happiness 
at something being cut from the HDFS options, with HDFS-9301 being the 
followon. I don't want the S3A config options to be the new HDFS config options.

. It's only a string, not some fundamental API feature; a constant string 
declaring what configuration option can be used.

> Add support for SSE-KMS and SSE-C in s3a filesystem
> ---------------------------------------------------
>
>                 Key: HADOOP-13075
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13075
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Andrew Olson
>            Assignee: Federico Czerwinski
>
> S3 provides 3 types of server-side encryption [1],
> * SSE-S3 (Amazon S3-Managed Keys) [2]
> * SSE-KMS (AWS KMS-Managed Keys) [3]
> * SSE-C (Customer-Provided Keys) [4]
> Of which the S3AFileSystem in hadoop-aws only supports opting into SSE-S3 
> (HADOOP-10568) -- the underlying aws-java-sdk makes that very simple [5]. 
> With native support in aws-java-sdk already available it should be fairly 
> straightforward [6],[7] to support the other two types of SSE with some 
> additional fs.s3a configuration properties.
> [1] http://docs.aws.amazon.com/AmazonS3/latest/dev/serv-side-encryption.html
> [2] 
> http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingServerSideEncryption.html
> [3] http://docs.aws.amazon.com/AmazonS3/latest/dev/UsingKMSEncryption.html
> [4] 
> http://docs.aws.amazon.com/AmazonS3/latest/dev/ServerSideEncryptionCustomerKeys.html
> [5] http://docs.aws.amazon.com/AmazonS3/latest/dev/SSEUsingJavaSDK.html
> [6] 
> http://docs.aws.amazon.com/AmazonS3/latest/dev/kms-using-sdks.html#kms-using-sdks-java
> [7] http://docs.aws.amazon.com/AmazonS3/latest/dev/sse-c-using-java-sdk.html



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