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From "David S. Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9384) Update S3 native fs implementation to use AWS SDK to support authorization through roles
Date Tue, 16 Sep 2014 22:31:35 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14136386#comment-14136386

David S. Wang commented on HADOOP-9384:

+1 to [~stevel@apache.org]'s comment

> Update S3 native fs implementation to use AWS SDK to support authorization through roles
> ----------------------------------------------------------------------------------------
>                 Key: HADOOP-9384
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9384
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: fs/s3
>         Environment: Locally: RHEL 6, AWS S3
> Remotely: AWS EC2 (RHEL 6), AWS S3
>            Reporter: D. Granit
>            Priority: Minor
>         Attachments: HADOOP-9384-v2.patch, HADOOP-9384.patch
> Currently the S3 native implementation {{org.apache.hadoop.fs.s3native.Jets3tNativeFileSystemStore}}
requires credentials to be set explicitly. Amazon allows setting credentials for instances
instead of users, via roles. Such are rotated frequently and kept in a local cache all of
which is handled by the AWS SDK in this case the {{AmazonS3Client}}. The SDK follows a specific
order to establish whether credentials are set explicitly or via a role:
> - Environment Variables: AWS_ACCESS_KEY_ID and AWS_SECRET_KEY
> - Java System Properties: aws.accessKeyId and aws.secretKey
> - Instance Metadata Service, which provides the credentials associated with the IAM role
for the EC2 instance
> as seen in http://docs.aws.amazon.com/IAM/latest/UserGuide/role-usecase-ec2app.html
> To support this feature the current {{NativeFileSystemStore}} implementation needs to
be altered to use the AWS SDK instead of the JetS3t S3 libraries.
> A request for this feature has previously been raised as part of the Flume project (FLUME-1691)
where the HDFS on top of S3 implementation is used as a manner of logging into S3 via an HDFS

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