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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 Mon, 08 Oct 2018 18:30:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-13936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16642279#comment-16642279
] 

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

+ bulk operation needs to handle failure of delete call as it updates S3guard with only those
changes which went through

filter array passed to bulk deletes to only those which worked
immediate delete then complete call before throwing up the failure

> 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
>    Affects Versions: 3.0.0-beta1, 3.1.0, 3.1.1
>            Reporter: Rajesh Balamohan
>            Assignee: Steve Loughran
>            Priority: Blocker
>
> 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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