Steve Loughran updated HADOOP-15297:
    Attachment: HADOOP-15297-001.patchh

> Make s3a etag -> checksum publishing option
> -------------------------------------------
>                 Key: HADOOP-15297
>                 URL: https://issues.apache.org/jira/browse/HADOOP-15297
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>    Affects Versions: 3.1.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Blocker
>         Attachments: HADOOP-15297-001.patchh
> HADOOP-15273 shows how distcp doesn't handle non-HDFS filesystems with 
> checksums.
> Exposing Etags as checksums, HADOOP-13282, breaks workflows which back up to 
> s3a.
> Rather than revert  I want to make it an option, off by default. Once we are 
> happy with distcp in future, we can turn it on.
> Why an option? Because it lines up for a successor to distcp which saves src 
> and dest checksums to a file and can then verify whether or not files have 
> really changed. Currently distcp relies on dest checksum algorithm being the 
> same as the src for incremental updates, but if either of the stores don't 
> serve checksums, silently downgrades to not checking. 

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