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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-13936) S3Guard: DynamoDB can go out of sync with S3AFileSystem::delete operation
Date Fri, 03 Feb 2017 15:56:51 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15851645#comment-15851645
] 

Steve Loughran commented on HADOOP-13936:
-----------------------------------------

Is a TTL going to need an extra column on the DB? That's going to be a non-traumatic change
as far as ddb is concerned, if the client code sets some default timestamp on entries without
them.

> S3Guard: DynamoDB can go out of sync with S3AFileSystem::delete operation
> -------------------------------------------------------------------------
>
>                 Key: HADOOP-13936
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13936
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Rajesh Balamohan
>            Priority: Minor
>
> As a part of {{S3AFileSystem.delete}} operation {{innerDelete}} is invoked, which deletes
keys from S3 in batches (default is 1000). But DynamoDB is updated only at the end of this
operation. This can cause issues when deleting large number of keys. 
> E.g, it is possible to get exception after deleting 1000 keys and in such cases dynamoDB
would not be updated. This can cause DynamoDB to go out of sync. 



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