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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13075) Add support for SSE-KMS and SSE-C in s3a filesystem
Date Thu, 26 Jan 2017 10:32:24 GMT

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

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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