[jira] [Commented] (HADOOP-15191) Add Private/Unstable BulkDelete operations to supporting object stores for DistCP

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-15191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16344136#comment-16344136 ] 

Steve Loughran commented on HADOOP-15191:
-----------------------------------------

The patch I'm working on now (bigger, passing tests) doesn't contain any attempts to recover from partially failed deletes. That's a more complex issue which need to be implemented and tested more broadly, and is only relevant when you are mixing permissions down a tree. As S3A doesn't yet even handle delete(file) properly there, this new operation isn't making things worse

> Add Private/Unstable BulkDelete operations to supporting object stores for DistCP
> ---------------------------------------------------------------------------------
>
>                 Key: HADOOP-15191
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15191
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3, tools/distcp
>    Affects Versions: 2.9.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>         Attachments: HADOOP-15191-001.patch
>
>
> Large scale DistCP with the -delete option doesn't finish in a viable time because of the final CopyCommitter doing a 1 by 1 delete of all missing files. This isn't randomized (the list is sorted), and it's throttled by AWS.
> If bulk deletion of files was exposed as an API, distCP would do 1/1000 of the REST calls, so not get throttled.
> Proposed: add an initially private/unstable interface for stores, {{BulkDelete}} which declares a page size and offers a {{bulkDelete(List<Path>)}} operation for the bulk deletion.



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