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From "Aaron Fabbri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13904) DynamoDBMetadataStore to handle DDB throttling failures through retry policy
Date Thu, 19 Jan 2017 02:18:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15829172#comment-15829172
] 

Aaron Fabbri commented on HADOOP-13904:
---------------------------------------

Also, note that the DynamoDBMetadataStore scale test fails during cleanup.  This is because
the internal path normalization depends on having a S3AFileSystem instance available.  However,
I used the new {{MetadataStore#initialize(Configuration)}} interface, which does not set a
S3AFileSystem instance in the DynamoDBMetadataStore.  This new initialize() logic for DynamoDBMetadataStore
seems to be broken, so I will file a JIRA on that.

> 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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