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https://issues.apache.org/jira/browse/HADOOP-13904?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron Fabbri updated HADOOP-13904:
----------------------------------
    Attachment: HADOOP-13904-HADOOP-13345.004.patch

v4 patch removes TODOs, adds @value javadocs for constants, per 
[~ste...@apache.org]'s feedback.

> DynamoDBMetadataStore to handle DDB throttling failures through retry policy
> ----------------------------------------------------------------------------
>
>                 Key: HADOOP-13904
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13904
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: HADOOP-13345
>            Reporter: Steve Loughran
>            Assignee: Aaron Fabbri
>         Attachments: HADOOP-13904-HADOOP-13345.001.patch, 
> HADOOP-13904-HADOOP-13345.002.patch, HADOOP-13904-HADOOP-13345.003.patch, 
> HADOOP-13904-HADOOP-13345.004.patch, screenshot-1.png
>
>
> When you overload DDB, you get error messages warning of throttling, [as 
> documented by 
> AWS|http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Programming.Errors.html#Programming.Errors.MessagesAndCodes]
> Reduce load on DDB by doing a table lookup before the create, then, in table 
> create/delete operations and in get/put actions, recognise the error codes 
> and retry using an appropriate retry policy (exponential backoff + ultimate 
> failure) 



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