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From "Mingliang Liu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13345) S3Guard: Improved Consistency for S3A
Date Sun, 24 Jul 2016 02:51:20 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15390915#comment-15390915
] 

Mingliang Liu commented on HADOOP-13345:
----------------------------------------

Thanks for addressing the comments, [~cnauroth]. I like the design and look forward to its
addressing the important S3A consistency problem in Hadoop.

{quote}
Are you recommending this based on the fact that the AWS SDK JavaDocs for withKeyConditions
describe it as a "legacy parameter", or is there something more to it? This is my first time
working with DynamoDB, so I'm learning as I go.
{quote}
Sorry I don't have solid support. It stems from my personal experience when I worked for DynamoDB.
Key condition expression is a new and easier approach to using expression-style syntax for
specifying the key conditions. I searched and found the official AWS blog [here|https://aws.amazon.com/blogs/aws/dynamodb-update-improved-json-editing-key-condition-expressions/].
I then realized that the conditions of DDB requests are not that complex in the current design.
I now believe it's minor and can be improved later.

> S3Guard: Improved Consistency for S3A
> -------------------------------------
>
>                 Key: HADOOP-13345
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13345
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs/s3
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>         Attachments: HADOOP-13345.prototype1.patch, S3C-ConsistentListingonS3-Design.pdf,
S3GuardImprovedConsistencyforS3A.pdf, s3c.001.patch
>
>
> This issue proposes S3Guard, a new feature of S3A, to provide an option for a stronger
consistency model than what is currently offered.  The solution coordinates with a strongly
consistent external store to resolve inconsistencies caused by the S3 eventual consistency
model.



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