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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-16190) S3A copyFile operation to include source versionID or etag in the copy request
Date Thu, 14 Mar 2019 15:00:07 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-16190?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16792755#comment-16792755
] 

Steve Loughran commented on HADOOP-16190:
-----------------------------------------

these operations return 412 "precondition failed" on errors

* exception translation will need to handle that, mapping to RemoteFileChangedException (presumably
do this everywhere)
* going to be hard to recreate the failure mode we want here to test the failure mode reliably.

Also: copyFile must return (etag, version) so that the attributes of the copied file can be
used to update the S3Guard DDB tables

> S3A copyFile operation to include source versionID or etag in the copy request
> ------------------------------------------------------------------------------
>
>                 Key: HADOOP-16190
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16190
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.2.0
>            Reporter: Steve Loughran
>            Priority: Major
>
> The S3 {{CopyObjectRequest}} structure used to build a copy request takes, optionally
> * a version ID of the source file
> * the etag of the source file
> using these will guarantee that the source file is copied exactly once
> 1. When working with S3Guard in auth mode, and the etag/version are kept in the DDB table,
that should be the authoritative source of metadata: fail fast if the file is out of date
> 2. And when non-auth mode is used, the getObjectMetadata check made should update the
s3guard table if needed.



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