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https://issues.apache.org/jira/browse/HADOOP-14335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15978614#comment-15978614
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Steve Loughran commented on HADOOP-14335:
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+ also should add this to hadoop compatibility guidelines
> Improve DynamoDB schema update story
> ------------------------------------
>
> Key: HADOOP-14335
> URL: https://issues.apache.org/jira/browse/HADOOP-14335
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: HADOOP-13345
> Reporter: Sean Mackrory
> Assignee: Sean Mackrory
>
> On HADOOP-13760 I'm realizing that changes to the DynamoDB schema aren't
> great to deal with. Currently a build of Hadoop is hard-coded to a specific
> schema version. So if you upgrade from one to the next you have to upgrade
> everything (and then update the version in the table - which we don't have a
> tool or document for) before you can keep using S3Guard. We could possibly
> also make the definition of compatibility a bit more flexible, but it's going
> to be very tough to do that without knowing what kind of future schema
> changes we might want ahead of time.
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