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https://issues.apache.org/jira/browse/HADOOP-13936?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15805379#comment-15805379
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Steve Loughran commented on HADOOP-13936:
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Smaller batch sizes? It could cause throttling problems
> 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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