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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13904) DynamoDBMetadataStore to handle DDB throttling failures through retry policy
Date Thu, 19 Jan 2017 18:05:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15830348#comment-15830348
] 

Steve Loughran commented on HADOOP-13904:
-----------------------------------------

good to see this, and nice to see test first dev at work

# do these run iff `-Dscale` is set? I'd prefer that, as I've tried to split the slow stuff
from the fast stuff in the s3a tests to date
# If you want a standard `NanoTimer.operationsPerSecond()` value for printing, feel free to
add it

> 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
>
>
> 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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